| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| HESPA | Hexalectris spicata (Walt.) Barnh. var. arizonica (S. Wats.) Catling & Engel | spiked crested coralroot | Orchidaceae
|
| HESPS3 | Hexalectris spicata (Walt.) Barnh. var. spicata | spiked crested coralroot | Orchidaceae
|
| HESP3 | Hexalectris spicata (Walt.) Barnh. | spiked crested coralroot | Orchidaceae
|
| HEWA | Hexalectris warnockii Ames & Correll | Texas crested coralroot | Orchidaceae
|
| HEXAL | Hexalectris Raf. | crested coralroot | Orchidaceae
|
| HEARA | Hexastylis arifolia (Michx.) Small var. arifolia | littlebrownjug | Aristolochiaceae
|
| HEARC | Hexastylis arifolia (Michx.) Small var. callifolia (Small) Blomquist | littlebrownjug | Aristolochiaceae
|
| HEARR | Hexastylis arifolia (Michx.) Small var. ruthii (Ashe) Blomquist | Ruth's littlebrownjug | Aristolochiaceae
|
| HEAR6 | Hexastylis arifolia (Michx.) Small | littlebrownjug | Aristolochiaceae
|
| HECO19 | Hexastylis contracta Blomquist | mountain heartleaf | Aristolochiaceae
|
| HEHE12 | Hexastylis heterophylla (Ashe) Small | variableleaf heartleaf | Aristolochiaceae
|
| HELE2 | Hexastylis lewisii (Fern.) Blomquist & Oosting | Lewis' heartleaf | Aristolochiaceae
|
| HEME7 | Hexastylis memmingeri (Ashe) Small | Hexastylis virginica | Aristolochiaceae
|
| HEMI13 | Hexastylis minor (Ashe) Blomquist | little heartleaf | Aristolochiaceae
|
| HENA3 | Hexastylis naniflora Blomquist | dwarfflower heartleaf | Aristolochiaceae
|
| HERH | Hexastylis rhombiformis Gaddy | North Fork heartleaf | Aristolochiaceae
|
| HERU5 | Hexastylis ruthii (Ashe) Small | Hexastylis arifolia var. ruthii | Aristolochiaceae
|
| HESHH | Hexastylis shuttleworthii (Britten & Baker) Small var. harperi Gaddy | largeflower heartleaf | Aristolochiaceae
|
| HESHS | Hexastylis shuttleworthii (Britten & Baker) Small var. shuttleworthii | largeflower heartleaf | Aristolochiaceae
|
| HESH2 | Hexastylis shuttleworthii (Britten & Baker) Small | largeflower heartleaf | Aristolochiaceae
|
| HESP4 | Hexastylis speciosa Harper | Harper's heartleaf | Aristolochiaceae
|
| HEVI3 | Hexastylis virginica (L.) Small | Virginia heartleaf | Aristolochiaceae
|
| HEXAS | Hexastylis Raf. | heartleaf | Aristolochiaceae
|
| HEDE10 | Heyderia decurrens (Torr.) K. Koch | Calocedrus decurrens | Cupressaceae
|
| HIBO2 | Hibiscadelphus bombycinus Forbes | hau kuahiwi | Malvaceae
|
| HICR | Hibiscadelphus crucibracteatus Hobdy | lava hau kuahiwi | Malvaceae
|
| HIDI | Hibiscadelphus distans Bishop & Herbst | Kauai hau kuahiwi | Malvaceae
|
| HIGI | Hibiscadelphus giffardianus Rock | Kilauea hau kuahiwi | Malvaceae
|
| HIHU | Hibiscadelphus hualalaiensis Rock | Hualalai hau kuahiwi | Malvaceae
|
| HIPU2 | Hibiscadelphus �puakuahiwi K. Baker & S. Allen | | Malvaceae
|
| HIWI | Hibiscadelphus wilderianus Rock | Maui hau kuahiwi | Malvaceae
|
| HIWO | Hibiscadelphus woodii D.H. Lorence & W.L. Wagner | Wood's hau kuahiwi | Malvaceae
|
| HIBIS | Hibiscadelphus Rock | hibiscadelphus | Malvaceae
|
| HIAB | Hibiscus abelmoschus L. | Abelmoschus moschatus | Malvaceae
|
| HIAC3 | Hibiscus acetosella Welw. ex Hiern. | African rosemallow | Malvaceae
|
| HIAC | Hibiscus aculeatus Walt. | comfortroot | Malvaceae
|
| HIARA2 | Hibiscus arnottianus Gray ssp. arnottianus | white rosemallow | Malvaceae
|
| HIARI | Hibiscus arnottianus Gray ssp. immaculatus (Roe) D. Bates | white rosemallow | Malvaceae
|
| HIARP3 | Hibiscus arnottianus Gray ssp. punaluuensis (Skottsberg) D. Bates | punaluu rosemallow | Malvaceae
|
| HIARP | Hibiscus arnottianus Gray var. punaluuensis (Skottsberg) O.& I. Deg. | Hibiscus arnottianus ssp. punaluuensis | Malvaceae
|
| HIAR | Hibiscus arnottianus Gray | white rosemallow | Malvaceae
|
| HIBI2 | Hibiscus bifurcatus Cav. | forkleaf rosemallow | Malvaceae
|
| HIBI | Hibiscus biseptus S. Wats. | Arizona rosemallow | Malvaceae
|
| HIBRB | Hibiscus brackenridgei Gray ssp. brackenridgei | Brackenridge's rosemallow | Malvaceae
|
| HIBRM | Hibiscus brackenridgei Gray ssp. mokuleianus (Roe) D. Bates | Mokulei rosemallow | Malvaceae
|
| HIBRM4 | Hibiscus brackenridgei Gray var. mokuleianus Roe | Hibiscus brackenridgei ssp. mokuleianus | Malvaceae
|
| HIBRM2 | Hibiscus brackenridgei Gray var. molokaianus Rock | Hibiscus brackenridgei ssp. brackenridgei | Malvaceae
|
| HIBR | Hibiscus brackenridgei Gray | Brackenridge's rosemallow | Malvaceae
|
| HIBR2 | Hibiscus brasiliensis auct. non L. | Hibiscus phoeniceus | Malvaceae
|
| HICA7 | Hibiscus californicus Kellogg | Hibiscus moscheutos ssp. lasiocarpos | Malvaceae
|
| HICA6 | Hibiscus calyphyllus Cav. | lemonyellow rosemallow | Malvaceae
|
| HICA5 | Hibiscus cannabinus L. | brown Indianhemp | Malvaceae
|
| HICA2 | Hibiscus cardiophyllus Gray | Hibiscus martianus | Malvaceae
|
| HICL | Hibiscus clayi O.& I. Deg. | red Kauai rosemallow | Malvaceae
|
| HICL2 | Hibiscus clypeatus L. | Congo mahoe | Malvaceae
|
| HICO2 | Hibiscus coccineus Walt. | scarlet rosemallow | Malvaceae
|
| HICOB | Hibiscus coulteri Harvey ex Gray var. brevipedunculatus M.E. Jones | Hibiscus coulteri | Malvaceae
|
| HICO | Hibiscus coulteri Harvey ex Gray | desert rosemallow | Malvaceae
|
| HICU3 | Hibiscus cubensis A. Rich. | Hibiscus striatus ssp. lambertianus | Malvaceae
|
| HIDA | Hibiscus dasycalyx Blake & Shiller | Neches River rosemallow | Malvaceae
|
| HIDEI | Hibiscus denudatus Benth. var. involucellatus Gray | Hibiscus denudatus | Malvaceae
|
| HIDE | Hibiscus denudatus Benth. | paleface | Malvaceae
|
| HIEE | Hibiscus eetveldeanus de Wildeman & Dur. | Hibiscus acetosella | Malvaceae
|
| HIEL | Hibiscus elatus Sw. | mahoe | Malvaceae
|
| HIES | Hibiscus esculentus L. | Abelmoschus esculentus | Malvaceae
|
| HIFUY | Hibiscus furcellatus Lam. var. youngianus (Gaud. ex Hook. & Arn.) Hochr. | lindenleaf rosemallow | Malvaceae
|
| HIFU | Hibiscus furcellatus Lam. | lindenleaf rosemallow | Malvaceae
|
| HIGR4 | Hibiscus grandiflorus Michx. | swamp rosemallow | Malvaceae
|
| HIIM | Hibiscus immaculatus Roe | Hibiscus arnottianus ssp. immaculatus | Malvaceae
|
| HIIN5 | Hibiscus incanus Wendl. f. | Hibiscus moscheutos ssp. moscheutos | Malvaceae
|
| HIKA | Hibiscus kahilii Forbes | Hibiscus kokio ssp. kokio | Malvaceae
|
| HIKOK | Hibiscus kokio Hbd. ex Wawra ssp. kokio | red rosemallow | Malvaceae
|
| HIKOS | Hibiscus kokio Hbd. ex Wawra ssp. saintjohnianus (Roe) D. Bates | St. John's rosemallow | Malvaceae
|
| HIKOP | Hibiscus kokio Hbd. ex Wawra var. pekeloi O.& I. Deg. | Hibiscus kokio ssp. kokio | Malvaceae
|
| HIKOP2 | Hibiscus kokio Hbd. ex Wawra var. pukoonis Caum | Hibiscus kokio ssp. kokio | Malvaceae
|
| HIKO | Hibiscus kokio Hbd. ex Wawra | red rosemallow | Malvaceae
|
| HILA2 | Hibiscus laevis All. | halberdleaf rosemallow | Malvaceae
|
| HILA3 | Hibiscus lambertianus Kunth | Hibiscus striatus ssp. lambertianus | Malvaceae
|
| HILA6 | Hibiscus lasiocarpos Cav. | Hibiscus moscheutos ssp. lasiocarpos | Malvaceae
|
| HILE4 | Hibiscus leucophyllus Shiller | Hibiscus moscheutos ssp. lasiocarpos | Malvaceae
|
| HILU | Hibiscus lunariifolius Willd. | hibiscus | Malvaceae
|
| HIMA5 | Hibiscus macrophyllus Roxb. ex Hornem. | largeleaf rosemallow | Malvaceae
|
| HIMA6 | Hibiscus martianus Zucc. | heartleaf rosemallow | Malvaceae
|
| HIMI2 | Hibiscus militaris Cav. | Hibiscus laevis | Malvaceae
|
| HIMOI | Hibiscus moscheutos L. ssp. incanus (Wendl. f.) Ahles | Hibiscus moscheutos ssp. moscheutos | Malvaceae
|
| HIMOL | Hibiscus moscheutos L. ssp. lasiocarpos (Cav.) O.J. Blanchard | crimsoneyed rosemallow | Malvaceae
|
| HIMOM | Hibiscus moscheutos L. ssp. moscheutos | crimsoneyed rosemallow | Malvaceae
|
| HIMOP | Hibiscus moscheutos L. ssp. palustris (L.) Clausen | Hibiscus moscheutos ssp. moscheutos | Malvaceae
|
| HIMOO | Hibiscus moscheutos L. var. occidentalis Torr. | Hibiscus moscheutos ssp. lasiocarpos | Malvaceae
|
| HIMOP2 | Hibiscus moscheutos L. var. purpurascens Sweet | Hibiscus moscheutos ssp. moscheutos | Malvaceae
|
| HIMO | Hibiscus moscheutos L. | crimsoneyed rosemallow | Malvaceae
|
| HIMU3 | Hibiscus mutabilis L. | Dixie rosemallow | Malvaceae
|
| HINE | Hibiscus newhousei Roe | Hibiscus clayi | Malvaceae
|
| HIOA | Hibiscus oahuensis O.& I. Deg. | Hibiscus kokio ssp. kokio | Malvaceae
|
| HIOC2 | Hibiscus oculiroseus Britt. | Hibiscus moscheutos ssp. moscheutos | Malvaceae
|
| HIOP | Hibiscus opulifolius Greene | Hibiscus moscheutos ssp. moscheutos | Malvaceae
|
| HIPA6 | Hibiscus palustris L. | Hibiscus moscheutos ssp. moscheutos | Malvaceae
|
| HIPE3 | Hibiscus pernambucensis Arruda | | Malvaceae
|
| HIPH | Hibiscus phoeniceus Jacq. | Brazilian rosemallow | Malvaceae
|
| HIPI5 | Hibiscus pilosus auct. non (Sw.) Fawcett & Rendle | Hibiscus poeppigii | Malvaceae
|
| HIPI4 | Hibiscus pinetorum Greene | Hibiscus moscheutos ssp. moscheutos | Malvaceae
|