• (1) Haagea schwarzii - Habenaria depressifolia
• (2) Habenaria dianthoides - Habenaria mayersii
• (3) Habenaria mechowii - Habenaria tibetica
• (4) Habenaria tienensis - Haemadictyon venosum
• (5) Haemadictyon warmingii - Hakea microcarpa
• (6) Hakea milliganii - Halimium chichuahuense
• (7) Halimium chihuahuense - Halosarcia halocnemoides subsp. caudata
• (8) Halosarcia halocnemoides subsp. halocnemoides - Hamelia xerocarpa var. xerocarpa
• (9) Hamelia xorullensis - Haplohymenium triste
• (10) Haplolejeunea cremersii - Hargasseria americana
• (11) Hargasseria americana cestrifolia - Hartogia lediformis
• (12) Hartogia leptospermodes - Haworthia cymbioformis
• (13) Haworthia davidii - Hazardia serrata
• (14) Hazardia squarrosa - Hebe canescens
• (15) Hebe cantaburiensis 'Moore' - Hechtia galeottii
• (16) Hechtia gayi - Hedera helix 'Helvig'
• (17) Hedera helix 'Henrietta' - Hedychium 'Betty Ho'
• (18) Hedychium 'Carnival' - Hedyotis laxa
• (19) Hedyotis leschenaultiana - Hedysarum latisiliquum
• (20) Hedysarum laxiflorum - Helenium 'Kugelsonne'
• (21) Helenium 'Kupfersprudel' - Helianthemum 'White Queen'
• (22) Helianthemum 'Windermere' - Helianthus 'Corona Dorica'
• (23) Helianthus 'Fillia' - Helianthus resinosus
• (24) Helianthus revolutus - Helichrysum fulgidum
• (25) Helichrysum fulvescens - Helichrysum sordescens
• (26) Helichrysum sordidum - Heliconia latispatha
• (27) Heliconia latispatha 'Distans' - Helictotrichon gonzaloi
• (28) Helictotrichon hackelii - Heliopsis procumbens
• (29) Heliopsis pulchra - Heliotropium peruvianum
• (30) Heliotropium petraeum - Helleborus foetidus 'Melle'
• (31) Helleborus foetidus 'Miss Jekyll' - Hellerorchis paniculata
• (32) Hellmuthia membranacea - Hemerocallis 'Acacia Baby Rose'
• (33) Hemerocallis 'Acacia Bella' - Hemerocallis 'Alex Townsend'
• (34) Hemerocallis 'Alexa Kathryn' - Hemerocallis 'Ambrosia Rows'
• (35) Hemerocallis 'Ambrosia Sundayhaus' - Hemerocallis 'Annies Delight'
• (36) Hemerocallis 'Annis Burgess Young' - Hemerocallis 'Asian Pearl'
• (37) Hemerocallis 'Asian Pheasant' - Hemerocallis 'Badge of Honor'
• (38) Hemerocallis 'Badger's Reminiscent Rainbow' - Hemerocallis 'Beauty To Behold'
• (39) Hemerocallis 'Beauty Within' - Hemerocallis 'Beyond the Sunshine'
• (40) Hemerocallis 'Beyond the Tiger' - Hemerocallis 'Blossom Music'
• (41) Hemerocallis 'Blossom Parade' - Hemerocallis 'Bourbon Prince'
• (42) Hemerocallis 'Bourbon Street' - Hemerocallis 'Brookwood Color Miel'
• (43) Hemerocallis 'Brookwood Corrie Schafer' - Hemerocallis 'Butter Drop'
• (44) Hemerocallis 'Butter Gold' - Hemerocallis 'Caribbean Orchid'
• (45) Hemerocallis 'Caribbean Peach Explosion' - Hemerocallis 'Chaffee'
• (46) Hemerocallis 'Chain Energy' - Hemerocallis 'Chin Hi'
• (47) Hemerocallis 'Chin Whiskers' - Hemerocallis 'Clyde Hyde'
• (48) Hemerocallis 'Clyde Jackson' - Hemerocallis 'Cosmic Treasure'
• (49) Hemerocallis 'Cosmic Vision' - Hemerocallis 'Curtsy'
• (50) Hemerocallis 'Curvaceous Cutie' - Hemerocallis 'Day After'
• (51) Hemerocallis 'Day Before Tomorrow' - Hemerocallis 'Devils Den'
• (52) Hemerocallis 'Devils Discipline' - Hemerocallis 'Double Cranberry Ruffles'
• (53) Hemerocallis 'Double Cranberry' - Hemerocallis 'Dual Personality'
• (54) Hemerocallis 'Dual Zone' - Hemerocallis 'Elberta Norred'
• (55) Hemerocallis 'Elco After Midnight' - Hemerocallis 'Enid Mary'
• (56) Hemerocallis 'Enigma of Absolutes' - Hemerocallis 'Eyes of Fire'
• (57) Hemerocallis 'Eyes of Fury' - Hemerocallis 'Fire Lane'
• (58) Hemerocallis 'Fire Line' - Hemerocallis 'Forsyth Golden Gift'
• (59) Hemerocallis 'Forsyth Great Genes' - Hemerocallis 'Gadsden Light'
• (60) Hemerocallis 'Gadsden Meshach' - Hemerocallis 'Gladys Kendall'
• (61) Hemerocallis 'Gladys Mae West' - Hemerocallis 'Grace's Gift'
• (62) Hemerocallis 'Grace's Little Lady' - Hemerocallis 'Gypsy Rage'
• (63) Hemerocallis 'Gypsy Rainbow' - Hemerocallis 'Helen Ashleigh'
• (64) Hemerocallis 'Helen Babb' - Hemerocallis 'Hoosier Heat Wave'
• (65) Hemerocallis 'Hoosier Honey' - Hemerocallis 'In Springtime'
• (66) Hemerocallis 'In Stark Detail' - Hemerocallis 'Iron Maiden'
• (67) Hemerocallis 'Iron Man' - Hemerocallis 'Jean Hamilton Memorial'
• (68) Hemerocallis 'Jean Harrison' - Hemerocallis 'Johnny Reb'
• (69) Hemerocallis 'Johnny To Bad' - Hemerocallis 'Kalamazoo Sweetheart'
• (70) Hemerocallis 'Kaleem' - Hemerocallis 'Kiss of Charm'
• (71) Hemerocallis 'Kiss of Chrome' - Hemerocallis 'Last Embrace'
• (72) Hemerocallis 'Last Enchantment' - Hemerocallis 'Lemonade Flurry'
• (73) Hemerocallis 'Lemonade Springs' - Hemerocallis 'Little Eyed Gem'
• (74) Hemerocallis 'Little Fairy Festival' - Hemerocallis 'Lord Randal'
• (75) Hemerocallis 'Lord Steyne' - Hemerocallis 'Madame Royale'
• (76) Hemerocallis 'Madame Ruby' - Hemerocallis 'Mango Creme'
• (77) Hemerocallis 'Mango Feast' - Hemerocallis 'Mary Barry'
• (78) Hemerocallis 'Mary Benea O'brien' - Hemerocallis 'Meryl'
• (79) Hemerocallis 'Mesa Sunset' - Hemerocallis 'Mokan Moon'
• (80) Hemerocallis 'Mokan Pink Dream' - Hemerocallis 'Muscle Man'
• (81) Hemerocallis 'Musettas Waltz' - Hemerocallis 'Neches Dawn'
• (82) Hemerocallis 'Neches Gold Nugget' - Hemerocallis 'Northern Glitter'
• (83) Hemerocallis 'Northern Jewel' - Hemerocallis 'Ono'
• (84) Hemerocallis 'Ontario Night' - Hemerocallis 'Painted Pony'
• (85) Hemerocallis 'Painted Rose' - Hemerocallis 'Pawleys Island Gem'
• (86) Hemerocallis 'Pawn of Prophecy' - Hemerocallis 'Phantasy Sapphire'
• (87) Hemerocallis 'Phantom Duck' - Hemerocallis 'Pink Stripes'
• (88) Hemerocallis 'Pink Stuff' - Hemerocallis 'Powder Face'
• (89) Hemerocallis 'Powder Flight' - Hemerocallis 'Prussian Art'
• (90) Hemerocallis 'Pryor Lane' - Hemerocallis 'Ragamuffin'
• (91) Hemerocallis 'Ragan Nichole' - Hemerocallis 'Red Vixen'
• (92) Hemerocallis 'Red Volunteer' - Hemerocallis 'Romancer'
• (93) Hemerocallis 'Romanesque Rose' - Hemerocallis 'Ruffian'
• (94) Hemerocallis 'Ruffian's Apprentice' - Hemerocallis 'Santiago Heat'
• (95) Hemerocallis 'Santiago' - Hemerocallis 'September Sunshine'
• (96) Hemerocallis 'September Winner' - Hemerocallis 'Siloam Bill Cannon'
• (97) Hemerocallis 'Siloam Bill Monroe' - Hemerocallis 'Simply Being Loved'
• (98) Hemerocallis 'Simply Delirious' - Hemerocallis 'Solar Max'
• (99) Hemerocallis 'Solar Moonglow' - Hemerocallis 'Spot of Yellow'
• (100) Hemerocallis 'Spotlight Truffle' - Hemerocallis 'Sudden Summer'
• (101) Hemerocallis 'Suddenly Blue' - Hemerocallis 'Sweet and Sassy'
• (102) Hemerocallis 'Sweet Angel Voice' - Hemerocallis 'Tennoaks Thunder in the Sun'
• (103) Hemerocallis 'Tennyson' - Hemerocallis 'Too Marvelous'
• (104) Hemerocallis 'Too Much Fun' - Hemerocallis 'Twilight Sky'
• (105) Hemerocallis 'Twilight Song' - Hemerocallis 'Victor Harwood'
• (106) Hemerocallis 'Victor Herbert' - Hemerocallis 'Watchyl Purple Martin'
• (107) Hemerocallis 'Watchyl Purple Pinstripe' - Hemerocallis 'White Cameo'
• (108) Hemerocallis 'White Castle' - Hemerocallis 'Wiregrass Beauty'
• (109) Hemerocallis 'Wiregrass Excitement' - Hemerocallis 'Young Love'
• (110) Hemerocallis 'Young Maggie' - Hemiboea poilanei
• (111) Hemiboea rubribracteata - Hemitelia hartii
• (112) Hemitelia hombersleyi - Henrya gualanensis
• (113) Henrya henryi - Heracleum sphondylium sibiricum
• (114) Heracleum sphondylium sphondylium - Hermannia mucronulata
• (115) Hermannia muirii - Herniaria cinerea
• (116) Herniaria corrigioloides - Herzogobryum vermiculare
• (117) Hesioda perianthomega - Hesperomeles pernettyoides var. microphylla
• (118) Hesperomeles resinoso-punctata - Heterophyllaea fiebrigii
• (119) Heterophyllaea lycioides - Heterosiphonia asymmetria
• (120) Heterosiphonia australis - Heuchera 'Carmen'
• (121) Heuchera 'Carousel' - Heuchera parviflora var. dissecta
• (122) Heuchera parviflora var. parviflora - Heynea pubescens
• (123) Heynea quinquejuga - Hibiscus 'Cadiz'
• (124) Hibiscus 'Calcutta' - Hibiscus flagellaris
• (125) Hibiscus flagelliformis - Hibiscus muhamedis
• (126) Hibiscus multifidus - Hibiscus rosa-sinensis 'Apricot Delight'
• (127) Hibiscus rosa-sinensis 'Apricot Flair' - Hibiscus rosa-sinensis 'Bradenton Herald'
• (128) Hibiscus rosa-sinensis 'Brady Forty One' - Hibiscus rosa-sinensis 'Christmas Flame'
• (129) Hibiscus rosa-sinensis 'Christmas Girl' - Hibiscus rosa-sinensis 'Doctor Joe'
• (130) Hibiscus rosa-sinensis 'Doctor John Phillips' - Hibiscus rosa-sinensis 'Fiji Island'
• (131) Hibiscus rosa-sinensis 'Fiji White Grandiflora' - Hibiscus rosa-sinensis 'Graham Mcgilvary'
• (132) Hibiscus rosa-sinensis 'Graham Miles' - Hibiscus rosa-sinensis 'Island Ember'
• (133) Hibiscus rosa-sinensis 'Island Empress' - Hibiscus rosa-sinensis 'Kouringo Krone'
• (134) Hibiscus rosa-sinensis 'Krakatoa' - Hibiscus rosa-sinensis 'Lynn M Dewey'
• (135) Hibiscus rosa-sinensis 'Lynn Mcgee' - Hibiscus rosa-sinensis 'Mission Bells'
• (136) Hibiscus rosa-sinensis 'Mississippi Magic' - Hibiscus rosa-sinensis 'Orangeade'
• (137) Hibiscus rosa-sinensis 'Orangeaid' - Hibiscus rosa-sinensis 'R. S.'
• (138) Hibiscus rosa-sinensis 'R.j. Kennard' - Hibiscus rosa-sinensis 'Scarlet Blush'
• (139) Hibiscus rosa-sinensis 'Scarlet Dip' - Hibiscus rosa-sinensis 'Sundreams'
• (140) Hibiscus rosa-sinensis 'Sungirl' - Hibiscus rosa-sinensis 'Victoria'
• (141) Hibiscus rosa-sinensis 'Victorian Angel' - Hibiscus syriacus 'Anemoniflora'
• (142) Hibiscus syriacus 'Aphrodite' - Hieracium albiflorum
• (143) Hieracium albinum - Hieracium cordifolium
• (144) Hieracium coreanum - Hieracium hypsiphyllum
• (145) Hieracium idae - Hieracium oleraceum
• (146) Hieracium oligocephalum - Hieracium sandbergianum
• (147) Hieracium sandbergii - Hieracium veresczaginii
• (148) Hieracium vernale - Himantoglossum hircinum
• (149) Himantoglossum hircinum var. affine - Hippeastrum caupolicanense
• (150) Hippeastrum cearense - Hippocrepis nevadensis
• (151) Hippocrepis prostrata - Hiraea ternifolia f. glandulosa
• (152) Hiraea ternifolia var. eglandulosa - Hoeckia aschersoniana
• (153) Hoehnea epilobioides - Holboellia angustifolia trifoliata
• (154) Holboellia apetala - Holostylis reniformis
• (155) Holostylis reniformis f. minor - Homalium senarium
• (156) Homalium serratum - Homoianthus humilis
• (157) Homoianthus laevis - Hopea decandra
• (158) Hopea depressinerva - Hordeum vulgare var. nigrum 'Mierwale'
• (159) Hordeum vulgare var. nudum - Horridocactus crispus
• (160) Horridocactus curvispinus - Hosta 'Allan P. McConnell'
• (161) Hosta 'Allegan Emperor' - Hosta 'Brass Ring'
• (162) Hosta 'Brave Amherst' - Hosta 'Dipsy Doodle'
• (163) Hosta 'Distinction' - Hosta 'Glowing Sparklers'
• (164) Hosta 'Glydor' - Hosta 'Honey Moon'
• (165) Hosta 'Honey' - Hosta 'Lakeside Ladyfinger'
• (166) Hosta 'Lakeside Lagoon' - Hosta 'Mohegan'
• (167) Hosta 'Mollies Blaue' - Hosta 'Quaker Lady'
• (168) Hosta 'Qualifying Queen' - Hosta 'Silver Shadow'
• (169) Hosta 'Silver Spoon' - Hosta 'Trill'
• (170) Hosta 'Triple Ripple' - Hosta longipes
• (171) Hosta longipes 'Aurea' - Hovenia trichocarpa var. robusta
• (172) Hoverdenia speciosa - Hoya teretifolia
• (173) Hoya Thai #3 - Humata subvestita
• (174) Humata tenuis - Huperzia cuernavacensis
• (175) Huperzia cumingii - Hyacinthella transcaspica
• (176) Hyacinthella turkewiczii - Hybanthus brevicaulis
• (177) Hybanthus brevilabris - Hydrangea 'Rubur'
• (178) Hydrangea 'Sabrina' - Hydrangea macrophylla 'Mariesii Lilacina'
• (179) Hydrangea macrophylla 'Mariesii Perfecta' - Hydrangea serrata 'Oamacha'
• (180) Hydrangea serrata 'Oto Hime' - Hydrocotyle polycephala
• (181) Hydrocotyle polyrhiza - Hydrotaenia meleagris
• (182) Hydrotaenia van-houttei - Hylotelephium populifolium
• (183) Hylotelephium pseudospectabile - Hymenocladia ceratocladia
• (184) Hymenocladia chondricola - Hymenophyllum elegans
• (185) Hymenophyllum elegans f. angusta - Hymenophyllum trianae
• (186) Hymenophyllum triangulare - Hyoscyamus gallagheri
• (187) Hyoscyamus grandiflorus - Hypericum adpressum var. fastigiatum
• (188) Hypericum adpressum var. spongiosum - Hypericum fuertesii
• (189) Hypericum fujisanense - Hypericum olympicum f. uniflorum
• (190) Hypericum olympicum f. uniflorum 'Citrinum' - Hypericum vulcanicum
• (191) Hypericum vulcanicum var. matsumurae - Hypnum compactum
• (192) Hypnum complanatulum - Hypnum reptiliforme
• (193) Hypnum resupinatum - Hypodematium pusillum
• (194) Hypodematium ruppellianum - Hypolytrum longifolium subsp. sylvaticum
• (195) Hypolytrum longirostre - Hypsela tridens
• (196) Hypselodelphys hirsuta - Hystrix sibirica