A._____________________

Abelia
Abeliophyllum (white forsythia)
Abelmoschus (okra)
Abies (fir)
Abroma
Abromeitiella (obsolete)
Abronia (sand verbena)
Abrus
Abutilon
Acacia (wattle)
Acaena
Acalypha
Acantholimon
Acanthophoenix
Acanthus
Acca
Acer (maple)
Achillea (yarrow)
Achimenantha (hybrid genus)
Achimenes
Acinos (calamint)
Aciphylla
Acmena
Acoelorraphe (saw palm)
Acokanthera
Aconitum (aconite, monkshood)
Acorus
Acradenia
Acrocomia
Actaea (baneberry)
Actinidia (kiwifruit)
Ada
Adansonia
Adenandra
Adenanthos
Adenia
Adenium
Adenocarpus
Adenophora
Adenostoma
Adiantum (maidenhair fern)
Adlumia
Adonis
Adromischus
Aechmea
Aegopodium
Aeonium
Aerangis (an orchid genus)
Aerides (an orchid genus)
Aeschynanthus
Aesculus
Aethionema
Afgekia
Agapanthus
Agapetes
Agastache
Agathis
Agathosma
Agave
Ageratum
Aglaia
Aglaomorpha
Aglaonema
Agonis
Agrimonia
Agrostemma (corn cockle)
Agrostis
Aichryson
Ailanthus (Tree of Heaven, etc.)
Aiphanes
Aira (hair grass)
Ajania
Ajuga (bugleweed)
Akebia
Alangium
Alberta
Albizia (silk tree)
Albuca
Alcea (hollyhock)
Alchemilla
Aldrovanda
Aleurites
Aliceara (hybrid genus)
Alisma (water plantain)
Alkanna
Allagoptera
Allamanda
Allium (onion)
Allocasuarina
Allosyncarpia
Alloxylon
Alluaudia
Alnus (alder)
Alocasia
Aloe
Aloinopsis
Alonsoa
Alopecurus (foxtail grass)
Aloysia
Alphitonia
Alpinia (ginger lily)
Alsobia
Alstonia
Alstroemeria
Alternanthera
Althaea
Alyogyne
Alyssum
Alyxia
Amaranthus
Amarcrinum (hybrid genus)
Amarygia (hybrid genus)
Amaryllis
Amberboa
Amelanchier
Amesiella
Amherstia
Amicia
Ammi
Ammobium
Amorpha
Amorphophallus
Ampelopsis
Amsonia
Anacampseros
Anacardium
Anacyclus
Anagallis (pimpernel)
Ananas (pineapple)
Anaphalis
Anchusa
Andersonia
Andira
Androlepis
Andromeda
Andropogon
Androsace
Anemia
Anemone (windflower)
Anemonella
Anemonopsis
Anemopaegma
Anethum (dill)
Angelica
Angelonia
Angiopteris
Angophora
Angraecum (an orchid genus)
Anguloa (an orchid genus)
Angulocaste (a hybrid orchid genus)
Anigozanthos
Anisacanthus
Anisodontea
Annona
Anoda
Anodelferia
Anomatheca (See Freesia)
Anopterus
Anredera
Antennaria
Anthemis
Anthericum
Anthocleista
Anthotroche
Anthriscus
Anthurium
Anthyllis
Antidesma
Antigonon
Antirrhinum (snapdragon)
Apera
Aphelandra
Aphyllanthes
Apium
Apocynum
Aponogeton
Apophyllum
Apodytes
Aponogeton
Aporocactus
Aporoheliocereus (hybrid genus)
Aprevalia
Aptenia
Aquilegia (columbine)
Arabis (rock cress)
Arachis
Arachniodes
Arachnis (scorpion orchid) (orchid genus)
Araeococcus
Araiostegia
Aralia
Araucaria (monkey-puzzle)
Araujia
Arbutus (madrone)
Archidendron
Archontophoenix (king palm)
Arctium
Arctostaphylos (bearberry, manzanita)
Arctotheca
Arctotis (African daisy)
Ardisia
Areca
Arenaria (sandwort)
Arenga
Argemone (prickly poppy)
Argyranthemum
Argyreia
Argyroderma
Ariocarpus
Arisaema
Arisarum
Aristea
Aristolochia
Aristotelia
Armeria
Armoracia
Arnebia
Arnica
Aronia (chokeberry)
Arrabidaea (See Saritaea)
Arrhenatherum (Oat Grass)
Artanema
Artabotrys
Artemisia (mugwort, sagebrush, wormwood)
Arthrocereus
Arthropodium
Artocarpus
Arum
Aruncus
Arundina
Arundinaria
Arundo
Asarina
Asarum (wild ginger)
Asclepias (milkweed, silkweed)
Ascocenda (hybrid genus) (an orchid genus)
Ascocentrum
Asimina
Asparagus
Asperula (woodruff)
Asphodeline
Asphodelus (asphodel)
Aspidistra
Asplenium
Astelia
Aster
Asteranthera
Astilbe
Astilboides
Astragalus (milk vetch)
Astrantia
Astrophytum
Asystasia
Atalaya
Athamanta
Atherosperma
Athrotaxis
Athyrium
Atriplex
Attalea
Aubrieta
Aucuba
Aulax
Auranticarpa
Aurinia
Austrocedrus
Austrocylindropuntia
Austrostipa
Averrhoa
Avicennia
Azadirachta
Azalea
Azara
Azolla (Aquatic ferns)
Azorella
Azorina
Aztekium
Azetura

B._____________________

Babiana
Baccharis
Backhousia
Bacopa (water hyssop)
Bactris
Baeckea
Baikiaea
Baileya
Ballota
Balsamorhiza (balsam root)
Bambusa (bamboo)
Banksia
Baptisia
Barbarea (Yellow rocket or winter cress)
Barkeria (an orchid genus)
Barleria
Barklya (Gold blossom tree)
Barnadesia
Barringtonia
Bartlettina
Basselinia
Bassia
Bauera
Bauhinia
Baumea
Beallara
Beaucarnea
Beaufortia
Beaumontia
Beccariella
Bedfordia
Begonia
Belamcanda
Bellevalia
Bellis (daisy)
Bellium
Berberidopsis
Berberis (barberry)
Berchemia
Bergenia
Bergerocactus
Berkheya
Berlandiera
Berrya
Bertolonia
Berzelia
Beschorneria
Bessera
Beta (beet)
Betula (birch)
Biarum
Bidens
Bignonia
Bikkia
Billardiera
Billbergia
Bischofia
Bismarckia
Bixa
Blandfordia
Blechnum (hard fern)
Bletilla (an orchid genus)
Blighia
Bloomeria
Blossfeldia
Bocconia
Boenninghausenia
Bolax
Bolbitis
Bollea (an orchid genus)
Boltonia
Bolusanthus
Bomarea
Bombax
Bongardia
Boophone
Borago
Borassodendron
Borassus
Boronia
Bosea
Bossiaea
Bothriochloa
Bougainvillea
Bouteloua
Bouvardia
Bowenia
Bowiea
Bowkeria
Boykinia
Brabejum
Brachychiton
Brachyglottis
Brachylaena
Brachypodium
Brachyscome
Brachysema
Brachystelma
Bracteantha
Brahea (Hesper palm)
Brassavola (an orchid genus)
Brassaia (Octopus tree)
Brassia (an orchid genus)
Brassica (mustard, cabbage)
Brassidium (hybrid orchids)
Brassocattleya (hybrid orchids)
Brassolaeliocattleya (trigeneric hybrid orchids)
Breynia
Briggsia
Brillantaisia
Brimeura
Briza (quaking grass)
Brodiaea
Bromelia
Broughtonia
Broussonetia
Browallia
Brownea
Browningia
Bruckenthalia
Brugmansia
Brunfelsia
Brunia
Brunnera
Brunsvigia
Brya
Buchloe
Buckinghamia
Buddleja
Buglossoides
Bulbine
Bulbinella
Bulbocodium
Bulbophyllum (an orchid genus)
Bulnesia
Bunchosia
Buphthalmum
Bupleurum
Burchardia
Burchellia
Burrageara
Burretiokentia
Bursaria
Bursera
Burtonia
Butea
Butia
Butomus
Buxus (boxwood)
Byrsonima
Bystropogon

C._____________________

Cabomba
Cadia
Caesalpinia (dwarf poinciana, Barbadose pride)
Caladium
Calamagrostis (reed grass, smallweed)
Calamintha (calamint)
Calamus
Calandrinia
Calanthe
Calathea
Calceolaria (slipperwort)
Calendula (pot marigold)
Calibanus
Calibrachoa
Calla
Calliandra
Callianthemum
Callicarpa (beauty berry)
Callicoma (black wattle)
Callirhoe (poppy mallow)
Callisia
Callistemon (bottlebrush)
Callistephus (Chinese aster)
Callitriche (water starwort)
Callitris (cypress pine)
Calluna (heather)
Calocedrus (incense cedar)
Calochone
Calochortus
Calodendrum (cape chestnut)
Calomeria
Calophaca
Calophyllum
Calopyxis
Caloscordum
Calothamnus
Calotropis
Calpurnia
Caltha (kingcup, marsh marigold)
Calycanthus
Calymmanthium
Calypso (an orchid genus)
Calytrix (starflower)
Camassia (quamash)
Camellia
Camoensia
Campanula (bellflower)
Campsis (trumpet vine)
Campylotropsis (SeeLespedeza)
Cananga (ylang ylang)
Canarina
Canistrum
Canna
Cantua
Capparis
Capsicum (pepper)
Caragana (peashrub)
Caralluma
Cardamine (bittercress)
Cardiocrinum
Cardiospermum
Cardwellia
Carex (sedge)
Carissa
Carlina
Carludovica
Carmichaelia
Carnegiea (saguaro)
Carpentaria
Carpenteria
Carphalea
Carpinus (hornbeam)
Carpobrotus
Carthamus (safflower)
Carum (caraway)
Carya (hickory, pecan)
Caryopteris
Caryota (fishtail palm)
Cassia (shower tree)
Cassinia
Cassiope
Cassipourea
Castanea (chestnut)
Castanopsis
Castanospermum (black bean)
Casuarina (sheoke)
Catalpa (Indian bean)
Catananche
Catasetum (an orchid genus)
Catha (khat tree)
Catharanthus (Madagascar periwinkle)
Catopsis
Cattleya (an orchid genus)
Caulophyllum
Cautleya
Cavendishia
Ceanothus (California-lilac)
Cedrela (toon)
Cedronella
Cedrus (cedar)
Ceiba (kapok)
Celastrus (staff-vine)
Celmisia (New Zealand daisy)
Celosia (cockscomb)
Celtis (hackberry)
Centaurea
Centaurium
Centradenia
Centranthus (valerian)
Cephalaria
Cephalocereus
Cephalophyllum
Cephalotaxus (plum-yew)
Ceraria
Cerastium
Ceratonia (St.John’s bread, carob bean)
Ceratopetalum (coachwood)
Ceratophyllum
Ceratopteris
Ceratostigma
Ceratozamia
Cerbera (sea mango)
Cercidiphyllum
Cercis (Judas tree, redbud)
Cercocarpus
Cereus
Ceropegia
Cestrum
Chadsia
Chaenomeles (flowering quince)
Chaenorhinum (dwarf snapdragon)
Chaerophyllum
Chamaecyparis (false cypress)
Chamaecytisus
Chamaedaphne
Chamaedorea
Chamaelirium
Chamaemelum (chamomile)
Chamaerops
Chamelaucium (wax flower)
Chasmanthe
Chasmanthium
Cheilanthes
Cheiridopsis
Chelidonium
Chelone (turtlehead)
Chiastophyllum
Chiliotrichum
Chilopsis (desert willow)
Chimaphila
Chimonanthus (wintersweet)
Chimonobambusa
Chionanthus (fringe tree)
Chionochloa
Chionodoxa (glory of the snow)
Chionoscilla (hybrid)
Chirita
Chlidanthus
Choisya
Chonemorpha (Frangipani vine)
Choricarpia (Brush Turpentine)
Chorisia (floss silk tree)
Chorizema
Chrysalidocarpus
Chrysanthemoides
Chrysanthemum
Chrysobalanus
Chrysogonum
Chrysolepis
Chrysolepis
Chrysophyllum (star apple)
Chrysothemis
Chusquea
Cibotium
Cicerbita
Cichorium (chicory, endive)
Cimicifuga (bugbane)
Cinnamomum (camphor laurel)
Cionura
Cirsium
Cissus
Cistus (rock rose, sun rose)
Citharexylum (fiddlewood)
Citrofortunella (hybrid)
Citrus (lime, lemon)
Cladanthus
Cladrastis
Clarkia
Claytonia
Cleistocactus
Clematis
Cleome (spider flower)
Clerodendrum
Clethra (summersweet)
Cleyera
Clianthus
Clintonia
Clitoria
Clivia
Clusia
Clytostoma
Cobaea
Coccoloba (sea grape)
Coccothrinax (thatch palm)
Cocculus
Cochlioda
Cochlospermum (buttercup tree, Maximiliana)
Cocos (coconut)
Codiaeum (croton)
Codonanthe
Codonopsis
Coelia
Coelogyne (an orchid genus)
Coffea (coffee tree)
Coix
Colchicum (autumn crocus, meadow saffron)
Coleonema
Colletia
Collinsia
Collomia
Colocasia (taro)
Colquhounia
Columnea
Colutea (bladder senna)
Coluteocarpus
Colvillea
Combretum
Comesperma
Commelina (day flower, spiderwort, widow’s tears)
Commersonia
Commidendrum
Commiphora
Comptonella
Comptonia
Conandron
Congea
Conicosia
Coniogramme
Conoclinium (mistflower)
Conophytum
Conospermum
Conostylis
Conradina
Consolida (larkspur)
Convallaria (lily-of-the-valley)
Convolvulus (bindweed, morning glory)
Copernicia (caranda palm, wax palm)
Copiapoa syn.Pilocopiapoa
Coprosma
Coptis (goldthread)
Cordia (bird lime tree)
Cordyline
Coreopsis (tickseed)
Coriandrum (coriander cilantro)
Coriaria
Cornus (dogwood, cornel)
Corokia
Coronilla
Correa
Corryocactus
Cortaderia (pampas grass, tussock grass)
Cortusa
Corybas (hemlet orchid)
Corydalis
Corylopsis (winter-hazel)
Corylus (hazel, filbert)
Corymbia
Corynocarpus
Corypha
Coryphantha
Cosmos
Costus
Cotinus (smoke bush)
Cotoneaster
Cotula (brass buttons)
Cotyledon
Couroupita (cannonball tree)
Crambe
Craspedia
Crassula
Crataegomespilus (hybrid)
Crataegus (hawthorn)
Crataemespilus (hybrid)
Crepis
Crescentia (calabash)
Crinodendron
Crinum
Crocosmia (falling stars, montbretia)
Crocus
Crossandra (firecracker flower)
Crotalaria (rattlepod)
Croton
Crowea
Cryptanthus (earth stars)
Cryptbergia (hybrid)
Cryptocarya
Cryptocoryne (water trumpet)
Cryptomeria (sugi, Japanese cedar)
Cryptostegia (Indian rubber vine)
Cryptotaenia
Ctenanthe
Cucumis
Cucurbita
Cuminum
Cunila
Cunninghamia (China-fir)
Cunonia
Cupaniopsis (tuckeroo)
Cuphea
Cupressus (cypress)
Cuprocyparis (hybrid)
Curcuma
Cussonia
Cyananthus (trailling bellflower)
Cyanotis
Cyathea (tree fern)
Cyathodes
Cybistax
Cycas (cycad, sago “palm”)
Cyclamen
Cycnoches
Cydista(withe)
Cydonia (quince)
Cylindropuntia
Cymbalaria (ivy-leaved toadflax)
Cymbidium (an orchid genus)
Cymbopogon
Cynara
Cynodon
Cynoglossum (hound’s tongue)
Cypella
Cyperus
Cyphomandra (tree tomato)
Cyphostemma
Cypripedium (lady’s slipper)(an orchid genus)
Cyrilla
Cyrtanthus (fire lily)
Cyrtomium
Cyrtostachys
Cystopteris (bladder fern)
Cytisus (broom)

D._____________________

Daboecia
Dacrydium
Dactylis
Dactylorhiza (marsh orchid)
Dahlia
Dalea (indigo bush)
Dalechampia
Damasonium
Dampiera
Danae
Daphne
Daphniphyllum
Darlingia
Darmera syn. Peltiphyllum
Darwinia (scent myrtle)
Dasylirion
Datura
Davallia (hare’s foot fern)
Davidia
Daviesia
Decaisnea
Degarmoara ( a hybrid orchid genus)
Decarya
Decumaria
Deinanthe
Delairea
Delonix
Delosperma
Delphinium
Dendranthema
Dendrobium (an orchid genus)
Dendrocalamus
Dendrochilum (an orchid genus)
Dendromecon (tree poppy)
Denmoza
Dennstaedtia (cup fern)
Deppea
Derris
Derwentia
Deschampsia (hair grass)
Desfontainia
Desmodium
Deuterocohnia syn. Abromeitiella
Deutzia
Dianella (flax lily)
Dianthus (carnation, pink)
Diascia (twinspur)
Dicentra (bleeding heart)
Dichelostemma
Dichondra
Dichorisandra
Dichroa
Dicksonia
Dicliptera
Dictamnus (burning bush, dittany)
Dictyosperma (princess palm)
Didymochlaena
Dieffenbachia (dumb cane, mother-in-law’s tongue, tuftroot)
Dierama (African harebell, angel’s fishing rod, wand flower)
Diervilla (bush honeysuckle)
Dietes
Digitalis (foxglove)
Dillenia
Dillwynia
Dimorphotheca (African daisy)
Dionaea (Venus flytrap)
Dionysia
Dioon
Dioscorea syns.Rajania, Tamus, Testudinaria(yam)
Diospyros (ebony, persimmon)
Dipcadi
Dipelta
Diphylleia
Diplarrhena (butterfly flag)
Diplazium
Diplocyclos
Diploglottis
Diplolaena
Dipsacus (teasel)
Dipteris
Dipteronia
Dipteryx
Dirca (leatherwood)
Disa (an orchid genus)
Disanthus
Discaria
Discocactus
Disocactus
Disporopsis
Disporum (fairy-bells)
Dissotis
Distictis
Distylium
Dizygotheca
Docynia
Dodecatheon (shooting stars, American cowslip)
Dodonaea (hop bush)
Dolichandrone
Dombeya
Doodia (hack saw fern, rasp fern)
Doronicum (leopard’s bane)
Dorotheanthus (ice plant, Livingstone daisy)
Dorstenia
Doryanthes (spear lily)
Doryopteris
Dovyalis
Draba (whitlow grass)
Dracaena
Dracocephalum
Dracophyllum
Dracula (an orchid genus)
Dracununculus
Dregea
Drimys
Drosanthemum
Drosera (sundew)
Dryandra
Dryas (mountain avens)
Drynaria
Dryopteris (buckler fern, sheild fern, wood fern)
Duboisia
Duchesnea (Indian strawberry, mock strawberry)
Dudleya
Duranta
Duvalia
Dyckia
Dymondia
Dypsis syn. Chrysalidocarpus, Neodypsis

E._____________________

Ebracteola
Ecballium
Eccremocarpus
Echeveria
Echidnopsis
Echinacea (coneflower)
Echinocactus
Echinocereus
Echinops (globe thistle)
Echinopsis
Echium
Edgeworthia
Edithcolea
Edraianthus
Egeria
Ehretia
Eichhornia (water hyacinth)
Elaeagnus
Elaeis (oil palm)
Elaeocarpus
Elatostema
Eleocharis (spike rush)
Elettaria
Eleutherococcus
Elodea (pondweed)
Elsholtzia
Elymus (wild rye)
Embothrium
Emilia (tassel flower)
Emmenopterys
Encelia
Encephalartos (Kaffir bread)
Encyclia (an orchid genus)
Enkianthus
Ensete
Eomecon (snow poppy)
Epacris
Ephedra (ephedra)
Epidendrum (an orchid genus)
Epigaea
Epilobium
Epimedium (barrenwort)
Epipactis (helleborine, an orchid genus)
Epiphyllum (orchid cactus)
Episcia (flame violet)
Epithelantha
Equisetum (horsetail)
Eragrostis (love grass)
Eranthemum
Eranthis (winter aconite)
Ercilla
Eremophila (Emu Bush)
Eremurus
Erica (heath/heather)
Erigeron (fleabane)
Erinacea
Erinus
Eriobotrya
Eriogonum
Eriophorum (cotton grass)
Eriophyllum
Eriostemon (waxflower)
Eritrichium
Erodium
Eryngium (eryngo, sea holly)
Erysimum (wallflower)
Erythrina (coral tree)
Erythronium
Escallonia
Eschscholzia (California poppy)
Escobaria
Espostoa
Etlingera
Eucalyptus (Gum tree, ironbark)
Eucharis
Eucomis
Eucommia
Eucryphia
Eulophia (an orchid genus)
Euonymus
Eupatorium
Euphorbia (spurge)
Euptelea
Eurya
Euryale
Euryops
Eustoma
Evolvulus
Exacum
Exochorda

F._____________________

Fabiana
Fagus (beech)
Fallopia
Farfugium
Fargesia
Fascicularia
Fatshederae (hybrid genus)
Fatsia
Faucaria
Felicia (blue daisy)
Fendlera
Fenestraria
Ferocactus
Ferraria
Ferula (giant fennel)
Festuca (fescue)
Fibigia
Ficus (fig)
Ficus pumila
Filipendula
Firmiana
Fittonia
Fitzroya
Fockea
Foeniculum (fennel)
Fontanesia
Forsythia
Fortunella (kumquat)
Fothergilla
Fouquieria
Frailea
Francoa
Frangipani
Franklinia
Fraxinus (ash)
Freesia
Fremontodendron
Fritillaria (fritillary)
Fuchsia
Furcraea

G._____________________

Gagea
Gaillardia
Galanthus (snowdrop)
Galax
Galega
Galium (bedstraw)
Galtonia
Gardenia
Garrya
Gasteria
Gaultheria
Gaura
Gaylussacia (huckleberry)
Gazania
Geissorhiza
Gelsemium
Genista
Gentiana (gentian)
Gentianopsis
Geranium (cranesbill, not same as Pelargonium)
Gerbera
Gesneria
Geum (avens)
Gevuina
Gibbaeum
Gilia
Gillenia
Ginkgo
Gladiolus
Glaucidium
Glaucium
Gleditsia (honey locust)
Globba
Globularia (globe daisy)
Gloriosa
Glottiphyllum
Gloxinia
Glyceria
Glycyrrhiza
Gomphocarpus
Gomphrena
Goniolimon
Goodyera (Jewel Orchid)
Gordonia
Graptopetalum
Graptophyllum
Graptoveria (hybrid genus)
Grevillea
Grewia
Greyia
Grindelia
Griselina
Gunnera (dinosaur food)
Guzmania
Gymnocalycium
Gymnocarpium
Gymnocladus
Gynandriris
Gynura
Gypsophila

H._____________________

Haageocereus
Haastia
Habenaria (an orchid genus)
Haberlea
Habranthus
Hacquetia
Haemanthus (blood lily)
Hakea
Hakonechloa
Halesia (silverbell)
Halimiocistus (hybrid genus)
Halimium
Halimodendron
Hamamelis (witch-hazel)
Haplopappus
Hardenbergia (coral pea)
Harrisia
Hatiora
Haworthia
Hebe
Hechtia
Hedera (ivy)
Hedychium
Hedyotis (bluets)
Hedysarum
Hedyscepe (umbrella palm)
Helenium (sneezeweed)
Helianthemum (rock rose)
Helianthus (sunflower)
Helichrysum
Heliconia
Helictotrichon
Heliocereus
Heliophila
Heliopsis (ox eye)
Heliotropium (heliotrope)
Helleborus (hellebore)
Heloniopsis
Hemerocallis (daylily)
Hemigraphis
Hepatica
Heptacodium
Heracleum
Herbertia
Hereroa
Hermannia
Hermodactylus
Hesperaloe
Hesperantha
Hesperis
Hesperocallis
Heterocentron
Heterotheca
Heuchera (coral flower)
Heucherella (hybrid genus)
Hibbertia
Hibiscus (rose of Sharon)
Hieracium (hawkweed)
Himalayacalamus
Hippeastrum (amaryllis)
Hippocrepis
Hippophae
Hohenbergia
Hohenbergiopsis
Hoheria
Holboellia
Holcus
Holmskioldia
Holodiscus
Homalocladium (ribbon bush)
Homeria
Hoodia
Hordeum (barley)
Horminum
Hosta (plantain lily)
Hottonia
Houttuynia
Hovea
Hovenia
Howea (sentry palm)
Hoya (wax flower)
Huernia
Humulus (hops)
Hummemannia
Huntleya
Hyacinthella
Hyacinthoides
Hyacinthus (hyacinth)
Hydrangea
Hydrastis (goldenseal)
Hydrocharis (frogbit)
Hydrocleys
Hydrocotyle (pennywort)
Hygrophila
Hylocereus
Hylomecon
Hymenocallis
Hymenosporum
Hyophorbe (bottle palm)
Hyoscyamus (henbane)
Hypericum (St. John’s wort, rose of Sharon)
Hyphaene (doum palm)
Hypocalymma
Hypoestes
Hypoxis (starflower)
Hypsela
Hyssopus (hyssop)

I._____________________

Iberis (candytuft)
Ibervillea
Idesia
Ilex (holly)
Illicium
Impatiens (balsam)
Imperata
Incarvillea
Indigofera
Inula
Iochroma
Ipheion
Ipomoea (morning glory)
Ipomopsis
Iresine
Iris
Isatis
Isoplexis
Isopyrum
Itea
Ixia (corn lily)
Ixiolirion
Ixora

J._____________________

Jaborosa
Jacaranda
Jacquemontia
Jamesia
Jancaea
Jasione
Jasminum (jasmine, jessamine)
Jatropha
Jeffersonia
Jovellana
Jovibarba
Juanulloa
Jubaea (Chilean wine palm)
Juglans (walnut)
Juncus (rush)
Juniperus (juniper)

K._____________________

Kadsura
Kaempferia
Kalanchoe
Kalimeris
Kalmia (Mountain Laurel)
Kalmiopsis
Kalopanax
Kelseya
Kerria
Kigelia (sausage tree)
Kirengeshoma
Kitaibela
Kleinia
Knautia
Knightia
Kniphofia
Koeleria (junegrass)
Koelreuteria (golden rain tree)
Kohleria
Kolkwitzia (beautybush)
Kosteletzkya
Kunzea

L._____________________

Lablab
Laburnocytisus
Laburnum (laburnum)
Laccospadix
Lachenalia (Cape cowslip)
Laelia (an orchid genus)
Laeliocattleya (hybrid orchid genus)
Lagarosiphon
Legenophora
Lagerstroemia
Lagunaria
Lagurus
Lamarckia
Lambertia
Lamium (deadnettle)
Lampranthus
Lantana (shrub verbena)
Lapageria
Lardizabala
Larix (larch)
Larrea (creosote bush)
Latania (Latan palm)
Lathraea
Lathyrus
Laurelia
Laurus
Lavandula (lavender)
Lavatera (mallow)
Lawsonia
Layia
Ledebouria
Ledodendron (hybrid genus)
Ledum
Leea
Legousia
Leiophyllum
Leipoldtia
Leitneria
Lemboglossum
Lenophyllum
Leonotis
Leontice
Leontopodium (edelweiss)
Lepidozamia
Leptinella
Leptodactylon
Lechenaultia
Lespedeza (bush clover)
Leucadendron
Leucanthemella
Leucanthemopsis
Leucanthemum
Leuchtenbergia
Leucocoryne
Leucogenes
Leucojum (snowflake)
Leucophyllum
Leucophyta
Leucopogon
Leucoraoulia (hybrid genus)
Leucospermum (pincushion)
Leucothoe
Lewisia
Leycesteria
Leymus
Liatris
Libertia
Libocedrus
Ligularia
Ligustrum (privet)
Lilium (lily)
Limnanthes
Limnocharis
Limonium (sea lavender)
Linanthus
Linaria (toadflax)
Lindelofia
Lindera
Lindheimeria (star daisy)
Linnaea (twinflower)
Linospadix
Linum (flax)
Liquidambar (sweetgum)
Liriodendron (tulip tree)
Liriope (lilyturf)
Lithocarpus
Lithodora
Lithophragma
Lithops
Littonia
Livistona
Lloydia
Loasa
Lobelia
Lobularia (sweet alyssum)
Lodoicea (coco-de-mer)
Loiseleuria
Lomandra (mat rush)
Lomatia
Lomatium
Lomatophyllum
Lonicera (honeysuckle)
Lopezia
Lophomyrtus
Lophospermum
Lophostemon
Loropetalum
Lotus
Luculia
Ludwigia
Luma
Lunaria
Lupinus (lupin)
Luzula (woodrush)
Lycaste (an orchid genus)
Lychnis (campion)
Lycium
Lycopodium (club moss)
Lycoris
Lygodium (climbing fern)
Lyonia
Lyonothamnus
Lysichiton (Yellow skunk cabbage)
Lysiloma
Lysimachia
Lythrum (loosestrife)

M._____________________

Maackia
Macfadyena
Machaeranthera
Mackaya
Macleania
Macleaya
Maclura
Macropidia
Macrozamia
Magnolia
Mahonia
Maianthemum (May lily)
Maihuenia
Malcolmia
Malephora
Malope
Malpighia
Malus (apple, crabapple)
Malva (mallow)
Malvastrum
Malvaviscus
Mammillaria
Mandevilla
Mandragora (mandrake)
Manettia
Manglietia
Maranta
Margyricarpus
Marrubium (horehound)
Marsilea (pepperwort)
Masdevallia (an orchid genus)
Matteuccia
Matthiola (stock)
Maurandella
Maurandya
Maxillaria (an orchid genus)
Maytenus
Mazus
Meconopsis
Medicago (alfalfa)
Medinilla
Meehania
Megacodon
Megaskepasma
Melaleuca (paperbark)
Melasphaerula
Melastoma
Melia
Melianthus
Melica (melic)
Melicytus
Melinis
Meliosma
Melissa (balm)
Melittis (Bastard Balm)
Melocactus
Menispermum (moonseed)
Mentha (mint)
Mentzelia (starflower)
Menyanthes
Menziesia
Merendera
Merremia
Mertensia
Mespilus
Metasequoia (dawn redwood)
Metrosideros
Meum
Mexicoa
Michauxia
Michelia
Microbiota
Microcachrys
Microlepia
Micromeria
Mikania
Milium
Milla
Millettia
Miltonia (an orchid genus)
Miltoniopsis (pansy orchid)
Mimetes
Mimosa (mimosa, or sensitive plant)
Mimulus (monkey flower)
Mirabilis
Miscanthus
Mitchella (partridge berry)
Mitella
Mitraria
Molinia
Moltkia
Moluccella
Monadenium
Monanthes
Monarda (bee balm)
Monardella
Monstera
Moraea
Morina
Morisia
Morus (plant) (Mulberry)
Mucuna
Muehlenbeckia
Mukdenia
Musa (banana, plantain)
Muscari (grape hyacinth)
Mussaenda
Mutisia
Myoporum
Myosotidium
Myosotis (forget-me-not)
Myrica
Myriophyllum (milfoil)
Myrrhis (sweet cicely)
Myrsine
Myrteola
Myrtillocactus
Myrtus (myrtle)

N._____________________

Nandina (heavenly bamboo)
Narcissus (daffodil)
Nasturtium (watercress)
Nautilocalyx
Nectaroscordium
Neillia
Nelumbo (lotus)
Nematanthus
Nemesia
Nemopanthus (mountain holly)
Nemophila
Neobuxbaumia
Neolitsea
Neolloydia
Neomarica
Neoporteria
Neoregelia
Nepenthes (pitcher plant)
Nepeta (catmint)
Nephrolepis
Nerine
Nerium (oleander)
Nertera
Nicandra
Nicotiana (tobacco)
Nidularium
Nierembergia
Nigella
Nipponanthemum
Nolana
Nomocharis
Nopalxochia
Nothofagus (southern beech)
Notholirion
Nothoscordum (false garlic)
Notospartium
Nuphar (spatterdock)
Nymania
Nymphaea (waterlily)
Nymphoides (floating heart)
Nyssa (tupelo)

O._____________________

Obregonia
Ochagavia
Ochna
Ocimum
Odontioda (hybrid orchid genus)
Odontocidium (hybrid orchid genus)
Odontoglossum (an orchid genus)
Odontonema
Odontonia (hybrid orchid genus)
Oemleria
Oenanthe (water dropwort)
Oenothera (evening primrose, sundrops)
Olea (olive)
Olearia (daisy bush)
Olneya
Olsynium
Omphalodes (navelwort)
Omphalogramma
Oncidium (an orchid genus)
Onoclea
Ononis (restharrow)
Onopordum
Onosma
Oophytum
Ophiopogon (lilyturf)
Ophrys (an orchid genus)
Ophthalmophyllum
Oplismenus
Opuntia (prickly pears, chollas and many other cactus species)
Orbea
Orbeopsis
Orchis (an orchid genus)
Oreocereus
Origanum (marjoram, oregano)
Orixa
Ornithogalum
Ornithophora
Orontium (golden club)
Orostachys
Oroya
Ortegocactus
Orthophytum
Orthrosanthus
Orychophragmus
Oryza (rice)
Osbeckia
Osmanthus
Osmarea
Osmaronia
Osmunda (royal fern)
Osteomeles
Osteospermum
Ostrowskia (giant bellflower)
Ostrya
Othonna
Ourisia
Oxalis (shamrock, sorrel)
Oxydendrum
Ozothamnus

P.____________________

Pachistima
Pachycereus
Pachycormus
Pachycymbium
Pachyphragma
Pachyphytum
Pachypodium
Pachysandra
Pachystachys
Pachystegia
Pachystima
Pachyveria (hybrid genus)
Paeonia (peony)
Paliurus
Pamianthe
Panax (ginseng)
Pancratium (sea lily)
Pandanus (screw pine)
Pandorea
Panicum
Pansy
Papaver (poppy)
Paphiopedilum (slipper orchid)
Paradisea (paradise lily)
Parahebe
Paraquilegia
Parkinsonia
Parnassia
Parochetus
Parodia
Paronychia
Parrotia
Parrotiopsis
Parthenocissus
Passiflora (granadilla, passionflower)
Patersonia
Patrinia
Paulownia
Paurotis
Pavonia
Pedilanthus
Pediocactus
Pelargonium (geranium)
Pellaea
Peltandra (arrow arum)
Peltoboykinia
Peltophorum
Peniocereus
Pennisetum
Penstemon
Pentachrondra
Pentaglottis
Pentas
Peperomia
Peraphyllum
Pereskia
Perezia
Pericallis
Perilla
Periploca
Perovskia
Pernettya (now included in Gaultheria)
Persea
Persicaria (fleeceflower, knotweed)
Petasites (butterbur, sweet coltsfoot)
Petrea
Petrocosmea
Petrophile
Petrophyton
Petrophytum (common misspelling of Petrophyton)
Petrorhagia
Petroselinum (parsley)
Petteria
Petunia
Phacelia
Phaedranassa (queen lily)
Phaius (an orchid genus)
Phalaenopsis (moth orchid)
Phalaris
Phebalium
Phegopteris (beech fern)
Phellodendron (cork tree)
Philadelphus (mock orange)
Philageria (hybrid genus)
Philesia
Phillyrea
Philodendron
Phlebodium
Phlomis
Phlox
Phoenix (date palm)
Phormium
Photinia
Phragmipedium (an orchid genus)
Phragmites (reed)
Phuopsis
Phygelius
Phylica (Cape myrtle)
Phylliopsis (hybrid genus)
Phyllocladus (toatoa)
Phyllodoce
Phyllostachys
Phyllothamnus (hybrid genus)
Physalis (ground cherry)
Physaria (bladderpod)
Physocarpus
Physoplexis
Physostegia
Phyteuma
Phytolacca (pokeweed)
Picea (spruce)
Picrasma
Pieris
Pilea
Pileostegia
Pileosella
Pilosocereus
Pimelea
Pimpinella
Pinanga
Pinckneya
Pinellia
Pinguicula (butterwort)
Pinus (pine)
Piper (pepper)
Piptanthus
Pisonia
Pistacia (pistachio)
Pistia
Pitcairnia
Pithecellobium
Pittosporum
Pityrogramma
Plantago (plantain)
Platanus (plane tree, sycamore)
Platycarya
Platycerium (staghorn fern)
Platycladus (Chinese arborvitae)
Platycodon (balloon flower)
Platystemon (creamcups)
Plectranthus
Pleioblastus
Pleione (an orchid genus)
Pleiospilos (living granite)
Pleurothallis (an orchid genus)
Plumeria (frangipani)
Poa
Podalyria
Podocarpus
Podophyllum (mayapple)
Podranea
Polemonium (jacob’s ladder, abscess root)
Polianthes
Poliothyrsis
Polygala (milkwort, seneca, snakeroot)
Polygonatum
Polygonum (knotweed, knotgrass)
Polypodium
Polyscias
Polystichum
Poncirus
Pongamia
Pontederia (pickerel weed)
Populus (aspen, poplar, cottonwood)
Porana
Portea
Portulaca (purslane, moss rose)
Portulacaria
Posoqueria
Potamogeton
Potentilla (cinquefoil)
Pothos
Potinara (hybrid orchid genus)
Pratia
Primula (primrose)
Prinsepia
Pritchardia
Proboscidea (unicorn plant)
Promenaea
Prosopis (mesquite)
Prostanthera (Mint Bush)
Protea
Prumnopitys
Prunella (self-heal)
Prunus (almond, apricot, cherry, peach, plum)
Pseuderanthemum
Pseudocydonia
Pseudolarix (golden-larch)
Pseudopanax
Pseudosasa
Pseudotsuga (douglas-fir)
Pseudowintera
Psiolotum
Psychopsis (butterfly orchid)
Psylliostachys (statice)
Ptelea
Pteris (brake, table fern)
Pterocactus
Pterocarya (wingnut)
Pteroceltis
Pterocephalus
Pterodiscus
Pteropogon
Pterostyrax
Ptilotus
Ptychosperma
Pueraria
Pulmonaria (lungwort)
Pulsatilla
Pultenaea
Punica (pomegranate)
Purshia
Puschkinia
Putoria
Puya
Pycnanthemum
Pycnostachys
Pyracantha (firethorn)
Pyrola (wintergreen)
Pyrostegia
Pyrrosia
Pyrus (pear)

Q._____________________

Quamoclit
Quaqua
Quercus (oak)
Quesnelia
Quisqualis

R._____________________

Ramonda
Ranunculus (buttercup, crowfoot)
Ranzania
Raoulia
Raphia (raffia)
Ratibida
Ravenala (traveler’s tree)
Rebutia
Rehderodendron
Rehmannia
Reineckia
Reinwardtia
Reseda (Mignonette)
Retama
Rhamnus
Rhaphidophora
Rhaphiolepis
Rhapidophyllum (needle palm)
Rhapis (lady palm)
Rheum (rhubarb)
Rhexia
Rhipsalis
Rhodanthe (strawflower)
Rhodanthemum
Rhodiola
Rhodochiton
Rhododendron
Rhodohypoxis
Rhodophiala
Rhodothamnus
Rhodotypos
Rhoeo
Rhoicissus
Rhombophyllum
Rhus (sumac)
Rhynchelytrum
Rhynchostylis (an orchid genus)
Ribes (currant)
Richea
Ricinus (castor-oil plant)
Rigidella
Robinia
Rochea
Rodgersia
Rodriguezia
Rohdea
Romanzoffia
Romneya (Matilija poppy, tree poppy)
Romulea
Rondeletia
Rosa (rose)
Roscoea
Rosmarinus (rosemary)
Rossioglossum
Rothmannia
Roystonea (royal palm)
Rubus (raspberry)
Rudbeckia (coneflower)
Ruellia
Rumex (dock)
Rumohra
Rupicapnos
Ruschia
Ruscus
Russelia
Ruta (rue)

S._____________________

Sabal (palmetto)
Saccharum (plume grass, sugar cane)
Sadleria
Sagina (pearlwort)
Sagittaria (arrowhead)
Saintpaulia (African violet)
Salix (willow)
Salpiglossis
Salvia (sage)
Salvinia
Sambucus (elder)
Sanchezia
Sandersonia
Sanguinaria (bloodroot)
Sanguisorba (burnet)
Sansevieria
Santolina
Sanvitalia (creeping zinnia)
Sapindus
Sapium (tallow tree)
Saponaria (soapwort)
Sarcocapnos
Sarcocaulon
Sarcococca
Saritaea
Sarmienta
Sarracenia (pitcher plant)
Sasa
Sassafras
Satureja (savory)
Sauromatum
Saxegothaea
Saxifraga (saxifrage)
Scabiosa (scabious plant)
Scadoxus (blood lily)
Scaevola
Schefflera
Schima
Schinus
Schisandra
Schizachyrium
Schizanthus
Schizopetalon
Schizophragma
Schizostylis
Schlumbergera
Schoenoplectus
Schomburgkia
Schotia
Schwantesia
Sciadopitys
Scilla
Scindapsus
Scirpoides
Sclerocactus
Scoliopsus
Scopolia
Scrophularia (figwort)
Scutellaria
Securinega
Sedum (stonecrop)
Selaginella
Selago
Selenicereus
Selinum
Semele
Semiaquilegia
Semiarundinaria
Sempervivum (hens and chicks)
Senecio (ragwort)
Senna (herb)
Sequoia (coast redwood)
Sequoiadendron (giant sequoia)
Seriphidium
Serissa
Serruria
Sesbania
Sesleria
Setaria
Shepherdia
Shibataea
Shortia
Sibiraea
Sidalcea
Sideritis
Silene (campion)
Silphium
Silybum
Simmondsia (jojoba)
Sinningia
Sinocalycanthus
Sinofranchetia
Sinojackia
Sinowilsonia
Sisyrinchium
Skimmia
Smilacina
Smilax
Smithiantha
Smyrnium
Sobralia
Solandra
Solanum (potato, nightshade)
Soldanella (snowbell)
Soleirolia
Solenopsis
Solenostemon
Solidago (goldenrod)
Solidaster (supposedly hybrid genus; see Solidago)
Sollya
Sonerila
Sophora
Sophrolaeliocattleya (trigeneric hybrid orchid)
Sophronitis (an orchid genus)
Sorbaria
Sorbus (rowan, whitebeam)
Sorghastrum
Sparaxis
Sparganium
Sparrmania
Spartina (cord grass)
Spartium (broom)
Spathiphyllum
Spathodea
Sphaeralcea
Spigelia
Spiraea (spirea)
Sprianthes (an orchid genus)
Sporobolus
Sprekelia
Stachys (betony)
Stachyurus
Stangeria
Stanhopea (an orchid genus)
Stapelia
Stapelianthus
Staphylea (bladdernut)
Stauntonia
Stenanthium
Stenocactus
Stenocarpus
Stenocereus
Stenomesson
Stenotaphron
Stenotus
Stephanandra
Stephanocereus
Stephanotis
Sternbergia
Stigmaphyllon
Stipa
Stokesia
Stomatium
Stratiotes
Strelitzia (Bird of Paradise (plant))
Streptocarpus (Cape primrose)
Streptosolen
Strobilanthes
Stromanthe
Strombocactus
Strongylodon
Stuartia
Stylidium
Stylophorum
Styphelia
Styrax
Succisa
Sulcorebutia
Sutera
Sutherlandia
Swainsona
Swainsonia
Syagrus
Sycoparrotia (hybrid genus)
Sycopsis
Symphoricarpos (snowberry)
Symphyandra
Symphytum (comfrey)
Symplocos
Synadenium
Syneilesis
Syngonium
Synnotia
Synthyris
Syringa (lilac)
Syzygium (rose apple)

T._____________________

Tabebuia
Tabernaemontana
Tacca
Tagetes (Mexican or French marigold)
Talinum (fameflower)
Tamarix (tamarisk)
Tanacetum (tansy)
Tanakaea
Tanakea
Tapeinochilus
Taxodium (bald cypress)
Taxus (yew)
Tecoma (plant)
Tecomanthe
Tecomaria
Tecophilaea
Telekia
Telephium
Tellima
Telopea (waratah)
Templetonia
Terminalia (plant)
Ternstroemia
Tetracentron
Tetradium (bee tree)
Tetranema
Tetraneuris
Tetrapanax
Tetrastigma
Tetratheca
Teucrium
Thalia (plant)
Thalictrum
Thelesperma
Thelocactus
Thelypteris
Thermopsis
Thespesia
Thevetia
Thlaspi
Thrinax (thatch palm)
Thryptomene (heath myrtle)
Thuja (thuja, arborvitae)
Thujopsis (hiba)
Thunbergia
Thymophylla
Thymus (thyme)
Tiarella
Tibouchina
Tigridia
Tilia (linden)
Tillandsia (air plant, Spanish moss)
Tipuana
Titanopsis
Tithonia (Mexican sunflower)
Todea
Tolmiea
Tolpis
Toona
Torenia
Torreya (nutmeg yew)
Tovara
Townsendia
Trachelium
Trachelospermum
Trachycarpus (chusan palm)
Trachymene
Tradescantia (spiderwort)
Trapa (water caltrop)
Trichodiadema
Trichosanthes
Tricyrtis (toad lily)
Trientalis
Trifolium (clover)
Trillium
Tripetaleia
Tripterygium
Triteleia (triplet lily)
Tritonia
Trochodendron
Trollius (globeflower)
Tropaeolum (nasturtium)
Tsuga (hemlock)
Tsusiophyllum
Tuberaria
Tulbaghia
Tulipa (tulip)
Tweedia
Tylecodon
Typha (cattail)

U._____________________

Uebelmannia
Ugni
Ulex (gorse)
Ulmus (elm)
Umbellularia
Uncinia
Uniola
Urceolina
Urginea
Ursinia
Utricularia (bladderwort)
Uvularia (merrybells, bellwort)

V.______________________

Vaccinium (blueberry, cranberry, huckleberry)
Valeriana (valerian)
Vallea
Vancouveria
Vanda (an orchid genus)
Vanilla
Veitchia
Vellozia
Veltheimia
Venidium (cape daisy and others)
Veratrum
Verbascum (mullein)
Verbena
Vernonia (ironweed)
Veronica (speedwell)
Veronicastrum
Verticordia
Vestia
Viburnum
Victoria (Giant Waterlily)
Vigna (cowpea and various beans)
Viguiera
Vinca (periwinkle)
Viola (pansy, violet)
Virgilia
Viscaria
Vitaliana
Vitex
Vitis (grape)
Vriesea

W._____________________

Wachendorfia
Wahlenbergia
Waldsteinia
Washingtonia
Watsonia
Weberocereus
Wedelia
Weigela
Weingartia
Weldenia
Welwitschia
Westringia
Widdringtonia
Wigandia
Wigginsia
Wikstroemia
Wilsonaria (hybrid orchid genus)
Wisteria
Wittrockia
Wolffia
Woodsia
Woodwardia (chain fern)
Worsleya
Wulfenia

X._____________________

Xanthoceras
Xanthorhiza
Xanthosoma
Xeranthemum
Xerophyllum
Xylosma

Y._____________________

Yucca
Yushania
Yuugao

Z._____________________

Zaluzianskya
Zamia
Zantedeschia (calla lily)
Zanthoxylum
Zauschneria
Zea (maize)
Zelkova
Zenobia
Zephyranthes
Zigadenus
Zinnia
Zizania (wild rice)
Zygopetalum (an orchid genus)

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GARDEN PLANTS

A._____________________