| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| HEMA7 | Heterocentron macrostachyum Naud. | Heterocentron subtriplinervium | Melastomataceae
|
| HESU4 | Heterocentron subtriplinervium (Link & Otto) A. Braun & Bouch� | pearlflower | Melastomataceae
|
| HETER11 | Heterocentron Hook. & Arn. | heterocentron | Melastomataceae
|
| HEDI8 | Heterocladium dimorphum (Brid.) Schimp. in B.S.G. | heterocladium moss | Pterigynandraceae
|
| HEHEF | Heterocladium heteropteroides Best var. filescens Best | Heterocladium macounii | Pterigynandraceae
|
| HEHE13 | Heterocladium heteropteroides Best | Heterocladium macounii | Pterigynandraceae
|
| HEMA18 | Heterocladium macounii Best | Macoun's heterocladium moss | Pterigynandraceae
|
| HEPR8 | Heterocladium procurrens (Mitt.) Jaeg. | heterocladium moss | Pterigynandraceae
|
| HESQ3 | Heterocladium squarrosulum Lindb. | Heterocladium dimorphum | Pterigynandraceae
|
| HETER13 | Heterocladium Schimp. in B.S.G. | heterocladium moss | Pterigynandraceae
|
| HERA3 | Heterocodon rariflorum Nutt. | rareflower heterocodon | Campanulaceae
|
| HETER2 | Heterocodon Nutt. | heterocodon | Campanulaceae
|
| HELE8 | Heterocyphelium leucampyx (Tuck.) Vainio | | Uncertain Lichen Family
|
| HETER15 | Heterocyphelium Vainio | heterocyphelium | Uncertain Lichen Family
|
| HEAL14 | Heterodermia albicans (Pers.) Swinscow & Krog | shield lichen | Physciaceae
|
| HEAP3 | Heterodermia appalachensis (Kruok.) Culb. | Appalachian shield lichen | Physciaceae
|
| HEBA4 | Heterodermia barbifera (Nyl.) K. P. Singh | shield lichen | Physciaceae
|
| HEBO8 | Heterodermia boryi (Fee) K. P. Singh & S. R. Singh | shield lichen | Physciaceae
|
| HECA29 | Heterodermia casarettiana (A. Massal.) Trevisan | Casarett's shield lichen | Physciaceae
|
| HECH3 | Heterodermia chondroidea W. A. Weber & D. D. Awasthi | shield lichen | Physciaceae
|
| HECO28 | Heterodermia comosa (Eschw.) Follm. & Redon | shield lichen | Physciaceae
|
| HECO23 | Heterodermia corallophora (Taylor) Skorepa | Heterodermia crocea | Physciaceae
|
| HECR12 | Heterodermia crocea R. C. Harris | shield lichen | Physciaceae
|
| HEDE6 | Heterodermia dendritica (Pers.) Poelt | tree shield lichen | Physciaceae
|
| HEDI6 | Heterodermia diademata (Taylor) D. D. Awasthi | shield lichen | Physciaceae
|
| HEDO2 | Heterodermia domingensis (Ach.) Trevisan | Heterodermia albicans | Physciaceae
|
| HEEC2 | Heterodermia echinata (Taylor) Culb. | shield lichen | Physciaceae
|
| HEER | Heterodermia erinacea (Ach.) W. A. Weber | shield lichen | Physciaceae
|
| HEGA2 | Heterodermia galactophylla (Tuck.) Culb. | shield lichen | Physciaceae
|
| HEGR19 | Heterodermia granulifera (Ach.) Culb. | shield lichen | Physciaceae
|
| HEHY5 | Heterodermia hypoleuca (Muhl.) Trevisan | shield lichen | Physciaceae
|
| HEJA3 | Heterodermia japonica (Sato) Swinscow & Krog | shield lichen | Physciaceae
|
| HELE11 | Heterodermia leucomelaena (L.) Poelt | Heterodermia leucomelos | Physciaceae
|
| HELE9 | Heterodermia leucomelos (L.) Poelt | shield lichen | Physciaceae
|
| HEMI16 | Heterodermia microphylla (Kurok.) Skorepa | smallleaf shield lichen | Physciaceae
|
| HENE6 | Heterodermia neoluecomelaena (Kurok.) Follmann & Redon | Heterodermia boryi | Physciaceae
|
| HEOB2 | Heterodermia obscurata (Nyl.) Trevisan | obscure shield lichen | Physciaceae
|
| HEPO7 | Heterodermia podocarpa (Bel.) D. D. Awasthi | Heterodermia barbifera | Physciaceae
|
| HEPR10 | Heterodermia propagulifera (Vainio) J. P. Dey | shield lichen | Physciaceae
|
| HEPS3 | Heterodermia pseudospeciosa (Kurok.) Culb. | shield lichen | Physciaceae
|
| HERU6 | Heterodermia rugulosa (Kurok.) Wetmore | rugulose shield lichen | Physciaceae
|
| HESI4 | Heterodermia sitchensis Goward & W. Noble | Sitka shield lichen | Physciaceae
|
| HESP8 | Heterodermia speciosa (Wulfen) Trevisan | shield lichen | Physciaceae
|
| HESQ2 | Heterodermia squamulosa (Degel.) Culb. | shield lichen | Physciaceae
|
| HETR11 | Heterodermia tremulans (Mull. Arg.) Culb. | Heterodermia speciosa | Physciaceae
|
| HETR10 | Heterodermia tropica (Kurok.) | tropic shield lichen | Physciaceae
|
| HETER16 | Heterodermia Trevisan | shield lichen | Physciaceae
|
| HEUN3 | Heterodraba unilateralis (M.E. Jones) Greene | ladiestongue mustard | Brassicaceae
|
| HETER3 | Heterodraba Greene | heterodraba | Brassicaceae
|
| HEHE6 | Heterogaura heterandra (Torr.) Coville | Clarkia heterandra | Onagraceae
|
| HEARA2 | Heteromeles arbutifolia (Lindl.) M. Roemer var. arbutifolia | toyon | Rosaceae
|
| HEARC2 | Heteromeles arbutifolia (Lindl.) M. Roemer var. cerina (Jepson) E. Murr. | toyon | Rosaceae
|
| HEARM | Heteromeles arbutifolia (Lindl.) M. Roemer var. macrocarpa (Munz) Munz | toyon | Rosaceae
|
| HEAR5 | Heteromeles arbutifolia (Lindl.) M. Roemer | toyon | Rosaceae
|
| HESA14 | Heteromeles salicifolia (K. Presl) Abrams | Heteromeles arbutifolia var. arbutifolia | Rosaceae
|
| HETER5 | Heteromeles M. Roemer | toyon | Rosaceae
|
| HEAF | Heterophyllium affine (Hook. in Kunth) Fleisch. | heterophyllium moss | Sematophyllaceae
|
| HEHA6 | Heterophyllium haldanianum (Grev.) Fleisch. | Callicladium haldanianum | Hypnaceae
|
| HENE4 | Heterophyllium nemorosum (Brid.) Kindb. | Heterophyllium affine | Sematophyllaceae
|
| HETER17 | Heterophyllium (Schimp.) C. M�ll. ex Kindb. | heterophyllium moss | Sematophyllaceae
|
| HECO10 | Heteropogon contortus (L.) Beauv. ex Roemer & J.A. Schultes | tanglehead | Poaceae
|
| HEME | Heteropogon melanocarpus (Ell.) Ell. ex Benth. | sweet tanglehead | Poaceae
|
| HESE4 | Heteropogon secundus J. Presl | Trachypogon spicatus | Poaceae
|
| HETER6 | Heteropogon Pers. | tanglehead | Poaceae
|
| HELA22 | Heteropterys laurifolia (L.) A. Juss. | dragon withe | Malpighiaceae
|
| HEPU17 | Heteropterys purpurea (L.) Kunth | bull withe | Malpighiaceae
|
| HEWY2 | Heteropterys wydleriana A. Juss. | ahorca caballo | Malpighiaceae
|
| HETER19 | Heteropterys Kunth | withe | Malpighiaceae
|
| HEPI2 | Heterosperma pinnatum Cav. | wingpetal | Asteraceae
|
| HETER7 | Heterosperma Cav. | heterosperma | Asteraceae
|
| HEAD2 | Heterotheca adenolepis (Fern.) Ahles | Pityopsis adenolepis | Asteraceae
|
| HEAS | Heterotheca aspera (Shuttlw. ex Small) Shinners | Pityopsis aspera | Asteraceae
|
| HEBA2 | Heterotheca barbata (Rydb.) Semple | Spokane false goldenaster | Asteraceae
|
| HEBO4 | Heterotheca bolanderi (Gray) Harms | Heterotheca sessiliflora ssp. bolanderi | Asteraceae
|
| HEBR7 | Heterotheca breweri (Gray) Shinners | Eucephalus breweri | Asteraceae
|
| HECA15 | Heterotheca camphorata (Eastw.) Semple | Heterotheca sessiliflora ssp. echioides var. camphorata | Asteraceae
|
| HECAC2 | Heterotheca camporum (Greene) Shinners var. camporum | lemonyellow false goldenaster | Asteraceae
|
| HECAG | Heterotheca camporum (Greene) Shinners var. glandulissimum Semple | lemonyellow false goldenaster | Asteraceae
|
| HECA16 | Heterotheca camporum (Greene) Shinners | lemonyellow false goldenaster | Asteraceae
|
| HECA8 | Heterotheca canescens (DC.) Shinners | hoary false goldenaster | Asteraceae
|
| HECO16 | Heterotheca correllii (Fern.) Ahles | Pityopsis graminifolia var. graminifolia | Asteraceae
|
| HECR4 | Heterotheca cruiseana (Dress) Harms | Chrysopsis gossypina ssp. cruiseana | Asteraceae
|
| HEDE7 | Heterotheca depressa (Rydb.) Dorn | Heterotheca villosa var. depressa | Asteraceae
|
| HEEC | Heterotheca echioides (Benth.) Shinners | Heterotheca sessiliflora ssp. echioides var. echioides | Asteraceae
|
| HEFA3 | Heterotheca falcata (Pursh) Harms | Pityopsis falcata | Asteraceae
|
| HEFA4 | Heterotheca fastigiata (Greene) Harms | Heterotheca sessiliflora ssp. fastigiata var. fastigiata | Asteraceae
|
| HEFL7 | Heterotheca flexuosa (Nash) Harms | Pityopsis flexuosa | Asteraceae
|
| HEFL10 | Heterotheca floribunda Benth. | Heterotheca grandiflora | Asteraceae
|
| HEFL8 | Heterotheca floridana (Small) R.W. Long | Chrysopsis floridana | Asteraceae
|
| HEFUA2 | Heterotheca fulcrata (Greene) Shinners var. amplifolia (Rydb.) Semple | rockyscree false goldenaster | Asteraceae
|
| HEFUA | Heterotheca fulcrata (Greene) Shinners var. arizonica Semple | Arizona false goldenaster | Asteraceae
|
| HEFUF | Heterotheca fulcrata (Greene) Shinners var. fulcrata | rockyscree false goldenaster | Asteraceae
|
| HEFUS | Heterotheca fulcrata (Greene) Shinners var. senilis (Woot. & Standl.) Semple | rockyscree false goldenaster | Asteraceae
|
| HEFU3 | Heterotheca fulcrata (Greene) Shinners | rockyscree false goldenaster | Asteraceae
|
| HEGO | Heterotheca gossypina (Michx.) Shinners | Chrysopsis gossypina ssp. gossypina | Asteraceae
|
| HEGRT3 | Heterotheca graminifolia (Michx.) Shinners var. tenuifolia (Torr.) Gandhi & Thomas | Pityopsis graminifolia var. tenuifolia | Asteraceae
|
| HEGRT2 | Heterotheca graminifolia (Michx.) Shinners var. tracyi (Small) R.W. Long | Pityopsis graminifolia var. tracyi | Asteraceae
|
| HEGR10 | Heterotheca graminifolia (Michx.) Shinners | Pityopsis graminifolia var. graminifolia | Asteraceae
|
| HEGR7 | Heterotheca grandiflora Nutt. | telegraphweed | Asteraceae
|
| HEHOC | Heterotheca horrida (Rydb.) Harms ssp. cinerascens (Blake) Semple | Heterotheca villosa var. scabra | Asteraceae
|
| HEHO3 | Heterotheca horrida (Rydb.) Harms | Heterotheca villosa var. nana | Asteraceae
|