| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| HELOA2 | Heliomeris longifolia (Robins. & Greenm.) Cockerell var. annua (M.E. Jones) Yates | longleaf false goldeneye | Asteraceae
|
| HELOL | Heliomeris longifolia (Robins. & Greenm.) Cockerell var. longifolia | longleaf false goldeneye | Asteraceae
|
| HELO6 | Heliomeris longifolia (Robins. & Greenm.) Cockerell | longleaf false goldeneye | Asteraceae
|
| HEMUB | Heliomeris multiflora Nutt. var. brevifolia (Greene ex Woot. & Standl.) Yates | showy goldeneye | Asteraceae
|
| HEMUM | Heliomeris multiflora Nutt. var. multiflora | showy goldeneye | Asteraceae
|
| HEMUN | Heliomeris multiflora Nutt. var. nevadensis (A. Nels.) Yates | Nevada goldeneye | Asteraceae
|
| HEMU3 | Heliomeris multiflora Nutt. | showy goldeneye | Asteraceae
|
| HEPO6 | Heliomeris porteri (Gray) Cockerell | Helianthus porteri | Asteraceae
|
| HESO2 | Heliomeris soliceps (Barneby) Yates | tropical false goldeneye | Asteraceae
|
| HETE18 | Heliomeris tenuifolia Gray | Viguiera stenoloba var. chihuahuensis | Asteraceae
|
| HELIO4 | Heliomeris Nutt. | false goldeneye | Asteraceae
|
| HEGR18 | Heliopsis gracilis Nutt. | Heliopsis helianthoides var. gracilis | Asteraceae
|
| HEHEO2 | Heliopsis helianthoides (L.) Sweet ssp. occidentalis T.R. Fisher | Heliopsis helianthoides var. occidentalis | Asteraceae
|
| HEHES4 | Heliopsis helianthoides (L.) Sweet ssp. scabra (Dunal) T.R. Fisher | Heliopsis helianthoides var. scabra | Asteraceae
|
| HEHEG | Heliopsis helianthoides (L.) Sweet var. gracilis (Nutt.) Gandhi & Thomas | smooth oxeye | Asteraceae
|
| HEHEH | Heliopsis helianthoides (L.) Sweet var. helianthoides | smooth oxeye | Asteraceae
|
| HEHEO | Heliopsis helianthoides (L.) Sweet var. occidentalis (T.R. Fisher) Steyermark | smooth oxeye | Asteraceae
|
| HEHES | Heliopsis helianthoides (L.) Sweet var. scabra (Dunal) Fern. | smooth oxeye | Asteraceae
|
| HEHES2 | Heliopsis helianthoides (L.) Sweet var. solidaginoides (L.) Fern. | Heliopsis helianthoides var. helianthoides | Asteraceae
|
| HEHE5 | Heliopsis helianthoides (L.) Sweet | smooth oxeye | Asteraceae
|
| HEMI11 | Heliopsis minor (Hook.) C. Mohr | Heliopsis helianthoides var. scabra | Asteraceae
|
| HEPA4 | Heliopsis parvifolia Gray | mountain oxeye | Asteraceae
|
| HESC14 | Heliopsis scabra Dunal | Heliopsis helianthoides var. scabra | Asteraceae
|
| HELIO2 | Heliopsis Pers. | heliopsis | Asteraceae
|
| HEAM4 | Heliotropium amplexicaule Vahl | clasping heliotrope | Boraginaceae
|
| HEAN7 | Heliotropium anchusifolium Poir. | Heliotropium amplexicaule | Boraginaceae
|
| HEAN5 | Heliotropium angiospermum Murr. | scorpion's-tail | Boraginaceae
|
| HEAN12 | Heliotropium angustifolium Torr. | Heliotropium torreyi | Boraginaceae
|
| HEANA | Heliotropium anomalum Hook. & Arn. var. argenteum Gray | Polynesian heliotrope | Boraginaceae
|
| HEAN8 | Heliotropium anomalum Hook. & Arn. | Polynesian heliotrope | Boraginaceae
|
| HEAN9 | Heliotropium antillanum Urban | Heliotropium lagoense | Boraginaceae
|
| HEAR16 | Heliotropium arborescens L. | garden heliotrope | Boraginaceae
|
| HECA26 | Heliotropium californicum Greene | Heliotropium convolvulaceum var. californicum | Boraginaceae
|
| HECO4 | Heliotropium confertifolium (Torr.) Torr. ex Gray | leafy heliotrope | Boraginaceae
|
| HECOC | Heliotropium convolvulaceum (Nutt.) Gray var. californicum (Greene) I.M. Johnston | phlox heliotrope | Boraginaceae
|
| HECOC7 | Heliotropium convolvulaceum (Nutt.) Gray var. convolvulaceum | phlox heliotrope | Boraginaceae
|
| HECOR2 | Heliotropium convolvulaceum (Nutt.) Gray var. racemosum (Rose & Standl.) I.M. Johnston | Heliotropium racemosum | Boraginaceae
|
| HECO5 | Heliotropium convolvulaceum (Nutt.) Gray | phlox heliotrope | Boraginaceae
|
| HECR10 | Heliotropium crispiflorum Urban | Heliotropium microphyllum | Boraginaceae
|
| HECUO3 | Heliotropium curassavicum L. ssp. oculatum (Heller) Thorne | Heliotropium curassavicum var. oculatum | Boraginaceae
|
| HECUC2 | Heliotropium curassavicum L. var. curassavicum | salt heliotrope | Boraginaceae
|
| HECUO2 | Heliotropium curassavicum L. var. obovatum DC. | seaside heliotrope | Boraginaceae
|
| HECUO | Heliotropium curassavicum L. var. oculatum (Heller) I.M. Johnston | seaside heliotrope | Boraginaceae
|
| HECU3 | Heliotropium curassavicum L. | salt heliotrope | Boraginaceae
|
| HEEU | Heliotropium europaeum L. | European heliotrope | Boraginaceae
|
| HEFR2 | Heliotropium fruticosum L. | Key West heliotrope | Boraginaceae
|
| HEGL3 | Heliotropium glabriusculum (Torr.) Gray | greeneye heliotrope | Boraginaceae
|
| HEGR6 | Heliotropium greggii Torr. | fragrant heliotrope | Boraginaceae
|
| HEGU2 | Heliotropium guanicense Urban | cotorrilla | Boraginaceae
|
| HEHO6 | Heliotropium horizontale Small | Heliotropium polyphyllum | Boraginaceae
|
| HEIN | Heliotropium indicum L. | Indian heliotrope | Boraginaceae
|
| HEIN10 | Heliotropium inundatum Sw. | Heliotropium procumbens var. procumbens | Boraginaceae
|
| HELA11 | Heliotropium lagoense (Warm.) Guerke | Antilles heliotrope | Boraginaceae
|
| HELE6 | Heliotropium leavenworthii Torr. | Heliotropium polyphyllum | Boraginaceae
|
| HEMI10 | Heliotropium microphyllum Sw. ex Wikstr. | littleleaf heliotrope | Boraginaceae
|
| HEMO4 | Heliotropium molle (Torr.) I.M. Johnston | soft heliotrope | Boraginaceae
|
| HEPA18 | Heliotropium parviflorum L. | Heliotropium angiospermum | Boraginaceae
|
| HEPE6 | Heliotropium peruvianum L. | Heliotropium arborescens | Boraginaceae
|
| HEPH | Heliotropium phyllostachyum Torr. | Heliotropium fruticosum | Boraginaceae
|
| HEPOH | Heliotropium polyphyllum Lehm. var. horizontale (Small) R.W. Long | Heliotropium polyphyllum | Boraginaceae
|
| HEPO | Heliotropium polyphyllum Lehm. | pineland heliotrope | Boraginaceae
|
| HEPR9 | Heliotropium pringlei B.L. Robins. | Pringle's heliotrope | Boraginaceae
|
| HEPRD | Heliotropium procumbens P. Mill. var. depressum (Cham.) Fosberg | fourspike heliotrope | Boraginaceae
|
| HEPRP2 | Heliotropium procumbens P. Mill. var. procumbens | fourspike heliotrope | Boraginaceae
|
| HEPR3 | Heliotropium procumbens P. Mill. | fourspike heliotrope | Boraginaceae
|
| HERA5 | Heliotropium racemosum Rose & Standl. | coastalplain heliotrope | Boraginaceae
|
| HERA7 | Heliotropium ramosissimum (Lehm.) DC. | wavy heliotrope | Boraginaceae
|
| HESP2 | Heliotropium spathulatum Rydb. | Heliotropium curassavicum var. obovatum | Boraginaceae
|
| HESU6 | Heliotropium supinum L. | dwarf heliotrope | Boraginaceae
|
| HETE3 | Heliotropium tenellum (Nutt.) Torr. | pasture heliotrope | Boraginaceae
|
| HETE10 | Heliotropium ternatum Vahl | bushy heliotrope | Boraginaceae
|
| HETE4 | Heliotropium texanum I.M. Johnston | Texas heliotrope | Boraginaceae
|
| HETO | Heliotropium torreyi I.M. Johnston | slimleaf heliotrope | Boraginaceae
|
| HEUN8 | Heliotropium undulatifolium Turrill | turnsole heliotrope | Boraginaceae
|
| HEUN4 | Heliotropium undulatum Vahl | Heliotropium ramosissimum | Boraginaceae
|
| HELIO3 | Heliotropium L. | heliotrope | Boraginaceae
|
| HEHY4 | Helleborus hyemalis L. | Eranthis hyemalis | Ranunculaceae
|
| HENI6 | Helleborus niger L. | black hellebore | Ranunculaceae
|
| HEOR3 | Helleborus orientalis Lam. | lenten-rose | Ranunculaceae
|
| HEVI | Helleborus viridis L. | green hellebore | Ranunculaceae
|
| HELLE | Helleborus L. | hellebore | Ranunculaceae
|
| HEPU15 | Helleriella punctulata (Reichenb. f.) Garay & Sweet | dotted orchid | Orchidaceae
|
| HELLE2 | Helleriella A.D. Hawkes | helleriella | Orchidaceae
|
| HELE7 | Helminthocarpon leprevostii Fee | | Graphidaceae
|
| HELMI | Helminthocarpon Fee | helminthocarpon | Graphidaceae
|
| HEZE | Helminthostachys zeylanica (L.) Hook. | kamraj | Ophioglossaceae
|
| HELMI2 | Helminthostachys Kaulf. | helminthostachys | Ophioglossaceae
|
| HECR11 | Helocarpon crassipes Th. Fr. | | Micareaceae
|
| HELOC2 | Helocarpon Th. Fr. | helocarpon | Micareaceae
|
| HEBLB | Helodium blandowii (Web. & Mohr) Warnst. var. blandowii | Blandow's helodium moss | Helodiaceae
|
| HEBLH | Helodium blandowii (Web. & Mohr) Warnst. var. helodioides (Ren. & Card. in R�ll) Crum et al. | Blandow's helodium moss | Helodiaceae
|
| HEBL2 | Helodium blandowii (Web. & Mohr) Warnst. | Blandow's helodium moss | Helodiaceae
|
| HEPAH | Helodium paludosum (Sull.) Aust. var. helodioides (Ren. & Card. in R�ll) Grout | Helodium blandowii var. helodioides | Helodiaceae
|
| HEPA20 | Helodium paludosum (Sull.) Aust. | helodium moss | Helodiaceae
|
| HELOD | Helodium Warnst. | helodium moss | Helodiaceae
|
| HEAS2 | Helonias asphodeloides L. | Xerophyllum asphodeloides | Liliaceae
|
| HEBU | Helonias bullata L. | swamppink | Liliaceae
|
| HEGR14 | Helonias graminea Ker-Gawl. | Stenanthium gramineum var. gramineum | Liliaceae
|
| HEPA22 | Helonias paniculatus Nutt. | Zigadenus paniculatus | Liliaceae
|
| HETE11 | Helonias tenax Pursh | Xerophyllum tenax | Liliaceae
|
| HEVI9 | Helonias virescens Kunth | Zigadenus virescens | Liliaceae
|