| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| HIPO | Hibiscus poeppigii (Spreng.) Garcke | Poeppig's rosemallow | Malvaceae
|
| HIRA | Hibiscus radiatus Cav. | monarch rosemallow | Malvaceae
|
| HIRO | Hibiscus rockii O.& I. Deg. | Hibiscus calyphyllus | Malvaceae
|
| HIRO2 | Hibiscus roeatae St. John | Hibiscus kokio ssp. saintjohnianus | Malvaceae
|
| HIROS | Hibiscus rosa-sinensis L. var. schizopetalus Dyer | Hibiscus schizopetalus | Malvaceae
|
| HIRO3 | Hibiscus rosa-sinensis L. | shoebackplant | Malvaceae
|
| HISA2 | Hibiscus sabdariffa L. | roselle | Malvaceae
|
| HISA3 | Hibiscus saintjohnianus Roe | Hibiscus kokio ssp. saintjohnianus | Malvaceae
|
| HISC7 | Hibiscus scaber Michx. | Hibiscus aculeatus | Malvaceae
|
| HISC3 | Hibiscus schizopetalus (Dyer) Hook. f. | fringed rosemallow | Malvaceae
|
| HISE | Hibiscus semilobatus Chapman | Hibiscus coccineus | Malvaceae
|
| HISTL2 | Hibiscus striatus Cav. ssp. lambertianus (Kunth) Blanch. ex Proct. | striped rosemallow | Malvaceae
|
| HIST | Hibiscus striatus Cav. | striped rosemallow | Malvaceae
|
| HISY | Hibiscus syriacus L. | rose of Sharon | Malvaceae
|
| HITI | Hibiscus tiliaceus L. | sea hibiscus | Malvaceae
|
| HITR4 | Hibiscus trilobus Aubl. | threelobe rosemallow | Malvaceae
|
| HITR | Hibiscus trionum L. | flower of an hour | Malvaceae
|
| HIUL | Hibiscus ula O.& I. Deg. | Hibiscus kokio ssp. kokio | Malvaceae
|
| HIVI | Hibiscus vitifolius L. | tropical rose mallow | Malvaceae
|
| HIWAH | Hibiscus waimeae Heller ssp. hannerae (O.& I. Deg.) D. Bates | white Kauai rosemallow | Malvaceae
|
| HIWAW | Hibiscus waimeae Heller ssp. waimeae | white Kauai rosemallow | Malvaceae
|
| HIWAH2 | Hibiscus waimeae Heller var. hannerae O.& I. Deg. | Hibiscus waimeae ssp. hannerae | Malvaceae
|
| HIWA | Hibiscus waimeae Heller | white Kauai rosemallow | Malvaceae
|
| HIYO | Hibiscus youngianus Gaud. ex Hook. & Arn. | Hibiscus furcellatus var. youngianus | Malvaceae
|
| HIBIS2 | Hibiscus L. | rosemallow | Malvaceae
|
| HIAL7 | Hicoria alba Britt. p.p. | Carya ovata | Juglandaceae
|
| HIAQ | Hicoria aquatica (Michx. f.) Britt. | Carya aquatica | Juglandaceae
|
| HIAR4 | Hicoria arkansana (Sarg.) Ashe | Carya texana | Juglandaceae
|
| HIAU3 | Hicoria austrina Small | Carya glabra var. megacarpa | Juglandaceae
|
| HIBO3 | Hicoria borealis Ashe | Carya ovata | Juglandaceae
|
| HICA8 | Hicoria carolinae-septentrionalis Ashe | Carya carolinae-septentrionalis | Juglandaceae
|
| HICO5 | Hicoria cordiformis (Wangenh.) Britt. | Carya cordiformis | Juglandaceae
|
| HIFL6 | Hicoria floridana (Sarg.) Sudworth | Carya floridana | Juglandaceae
|
| HIGLH | Hicoria glabra (P. Mill.) Britt. var. hirsuta Ashe | Carya glabra var. hirsuta | Juglandaceae
|
| HIGL | Hicoria glabra (P. Mill.) Britt. | Carya glabra var. glabra | Juglandaceae
|
| HILA7 | Hicoria laciniosa (Michx. f.) Sarg. | Carya laciniosa | Juglandaceae
|
| HIMY | Hicoria myristiciformis (Michx. f.) Britt. | Carya myristiciformis | Juglandaceae
|
| HIOV | Hicoria ovalis (Wangenh.) Ashe | Carya ovalis | Juglandaceae
|
| HIOV2 | Hicoria ovata (P. Mill.) Britt. | Carya ovata | Juglandaceae
|
| HIPA7 | Hicoria pallida Ashe | Carya pallida | Juglandaceae
|
| HIPE | Hicoria pecan (Marsh.) Britt. | Carya illinoinensis | Juglandaceae
|
| HITE2 | Hicoria texana Le Conte | Carya lecontei | Juglandaceae
|
| HITE3 | Hicoria texana auct. non Le Conte | Carya texana | Juglandaceae
|
| HITO | Hicoria tomentosa (Lam. ex Poir.) Raf. | Carya alba | Juglandaceae
|
| HIVI2 | Hicoria villosa (Sarg.) Ashe | Carya texana | Juglandaceae
|
| HIPI3 | Hicriopteris pinnata (Kunze) Ching | Diplopterygium pinnatum | Gleicheniaceae
|
| HIAC4 | Hieracium acuminatum Jord. | Hieracium lachenalii | Asteraceae
|
| HIAL | Hieracium albertinum Farr | Hieracium cynoglossoides | Asteraceae
|
| HIAL2 | Hieracium albiflorum Hook. | white hawkweed | Asteraceae
|
| HIAL4 | Hieracium �alleghaniense Britt. (pro sp.) | | Asteraceae
|
| HIARP2 | Hieracium argutum Nutt. var. parishii (Gray) Jepson | Hieracium argutum | Asteraceae
|
| HIAR2 | Hieracium argutum Nutt. | southern hawkweed | Asteraceae
|
| HIAR3 | Hieracium argyraeum Small | Hieracium megacephalon | Asteraceae
|
| HIAT | Hieracium �atramentarium (Naegeli & Peter) Zahn ex Engl. (pro sp.) | | Asteraceae
|
| HIAT2 | Hieracium atratum Fries | polar hawkweed | Asteraceae
|
| HIAU | Hieracium aurantiacum L. | orange hawkweed | Asteraceae
|
| HIAU2 | Hieracium auricula L. p.p. | Hieracium floribundum | Asteraceae
|
| HIBO | Hieracium bolanderi Gray | Bolander's hawkweed | Asteraceae
|
| HIBR3 | Hieracium �brachiatum Berth. ex DC. | | Asteraceae
|
| HICA10 | Hieracium caespitosum Dumort. | meadow hawkweed | Asteraceae
|
| HICAC | Hieracium canadense Michx. var. canadense | Canadian hawkweed | Asteraceae
|
| HICAF | Hieracium canadense Michx. var. fasciculatum (Pursh) Fern. | Canadian hawkweed | Asteraceae
|
| HICAH | Hieracium canadense Michx. var. hirtirameum Fern. | Hieracium fernaldii | Asteraceae
|
| HICAK | Hieracium canadense Michx. var. kalmii (L.) Scoggan | Hieracium kalmii | Asteraceae
|
| HICA3 | Hieracium canadense Michx. | Canadian hawkweed | Asteraceae
|
| HICA4 | Hieracium carneum Greene | Huachuca hawkweed | Asteraceae
|
| HICH | Hieracium chapacanum Zahn | Hieracium scouleri var. scouleri | Asteraceae
|
| HICO4 | Hieracium columbianum Rydb. | Hieracium canadense var. canadense | Asteraceae
|
| HICU2 | Hieracium cusickii Gandog. | Hieracium cynoglossoides | Asteraceae
|
| HICYN | Hieracium cynoglossoides Arv.-Touv. var. nudicaule Gray | Hieracium scouleri var. nudicaule | Asteraceae
|
| HICY | Hieracium cynoglossoides Arv.-Touv. | houndstongue hawkweed | Asteraceae
|
| HIDO | Hieracium �dorei Lepage | Hieracium floribundum | Asteraceae
|
| HIDU2 | Hieracium �duplex Peter | Hieracium flagellare var. cernuiforme | Asteraceae
|
| HIFAF | Hieracium �fassettii Lepage var. fassettii | | Asteraceae
|
| HIFAM | Hieracium �fassettii Lepage var. mendicum Lepage (pro nm.) | | Asteraceae
|
| HIFAW | Hieracium �fassettii Lepage var. wisconsinense Lepage (pro nm.) | | Asteraceae
|
| HIFA2 | Hieracium �fassettii Lepage | | Asteraceae
|
| HIFED | Hieracium fendleri Schultz-Bip. var. discolor Gray | yellow hawkweed | Asteraceae
|
| HIFEF | Hieracium fendleri Schultz-Bip. var. fendleri | yellow hawkweed | Asteraceae
|
| HIFEM | Hieracium fendleri Schultz-Bip. var. mogollense Gray | Mogollon hawkweed | Asteraceae
|
| HIFE | Hieracium fendleri Schultz-Bip. | yellow hawkweed | Asteraceae
|
| HIFE2 | Hieracium �fernaldii Lepage | | Asteraceae
|
| HIFLC2 | Hieracium flagellare Willd. ssp. cernuiforme Naegeli & Peter | Hieracium flagellare var. cernuiforme | Asteraceae
|
| HIFLC | Hieracium �flagellare Willd. (pro sp.) var. cernuiforme (Naegeli & Peter) Lepage (pro nm.) | | Asteraceae
|
| HIFLF | Hieracium �flagellare Willd. (pro sp.) var. flagellare | | Asteraceae
|
| HIFL2 | Hieracium �flagellare Willd. (pro sp.) | | Asteraceae
|
| HIFL5 | Hieracium flettii St. John & Warren | Hieracium cynoglossoides | Asteraceae
|
| HIFL | Hieracium florentinum All. | Hieracium piloselloides | Asteraceae
|
| HIFL3 | Hieracium �floribundum Wimmer & Grab. (pro sp.) | | Asteraceae
|
| HIFU2 | Hieracium �fuscatrum Naegeli & Peter (pro sp.) | | Asteraceae
|
| HIGRA | Hieracium gracile Hook. var. alaskanum Zahn | Alaska hawkweed | Asteraceae
|
| HIGRD2 | Hieracium gracile Hook. var. densifloccosum (Zahn) Cronq. | Hieracium gracile var. gracile | Asteraceae
|
| HIGRD | Hieracium gracile Hook. var. detonsum (Gray) Gray | low alpine hawkweed | Asteraceae
|
| HIGRG | Hieracium gracile Hook. var. gracile | slender hawkweed | Asteraceae
|
| HIGRY | Hieracium gracile Hook. var. yukonense Porsild | Yukon hawkweed | Asteraceae
|
| HIGR | Hieracium gracile Hook. | slender hawkweed | Asteraceae
|
| HIGR2 | Hieracium greenei Gray | Greene's hawkweed | Asteraceae
|
| HIGR5 | Hieracium greenii Porter & Britt. | Maryland hawkweed | Asteraceae
|
| HIGR7 | Hieracium �grohii Lepage | | Asteraceae
|
| HIGRF | Hieracium gronovii L. var. foliosum Michx. | Hieracium gronovii | Asteraceae
|
| HIGR3 | Hieracium gronovii L. | queendevil | Asteraceae
|