| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| HYNO4 | Hygrohypnum norvegicum (Schimp. in B.S.G.) Amann | Norway hygrohypnum moss | Amblystegiaceae
|
| HYNO5 | Hygrohypnum novae-caesareae (Aust.) Grout | Hygrohypnum micans | Amblystegiaceae
|
| HYOCF | Hygrohypnum ochraceum (Turn. ex Wils.) Loeske var. filiforme (Limpr.) Amann | Hygrohypnum ochraceum | Amblystegiaceae
|
| HYOCF2 | Hygrohypnum ochraceum (Turn. ex Wils.) Loeske var. flaccidum (Milde) Amann | Hygrohypnum ochraceum | Amblystegiaceae
|
| HYOCU | Hygrohypnum ochraceum (Turn. ex Wils.) Loeske var. uncinatum (Milde) Loeske | Hygrohypnum ochraceum | Amblystegiaceae
|
| HYOC5 | Hygrohypnum ochraceum (Turn. ex Wils.) Loeske | hygrohypnum moss | Amblystegiaceae
|
| HYPAE | Hygrohypnum palustre Loeske var. ehlei (Arnell) Grout | Hygrohypnum luridum | Amblystegiaceae
|
| HYPAJ | Hygrohypnum palustre Loeske var. julaceum (Schimp. in B.S.G.) Loeske | Hygrohypnum luridum | Amblystegiaceae
|
| HYPAS | Hygrohypnum palustre Loeske var. subsphaericarpon (Brid.) Loeske | Hygrohypnum luridum | Amblystegiaceae
|
| HYPA9 | Hygrohypnum palustre Loeske | Hygrohypnum luridum | Amblystegiaceae
|
| HYPOF | Hygrohypnum polare (Lindb.) Loeske var. falcatum (Bryhn) Broth. | Hygrohypnum polare | Amblystegiaceae
|
| HYPO70 | Hygrohypnum polare (Lindb.) Loeske | northern hygrohypnum moss | Amblystegiaceae
|
| HYPS3 | Hygrohypnum pseudomontanum (Kindb.) Grout | Hygrohypnum luridum | Amblystegiaceae
|
| HYSMG | Hygrohypnum smithii (Sw. in Lilj.) Broth. var. goulardii (Schimp.) Wijk & Marg. | Hygrohypnum molle | Amblystegiaceae
|
| HYSM | Hygrohypnum smithii (Sw. in Lilj.) Broth. | Smith's hygrohypnum moss | Amblystegiaceae
|
| HYST5 | Hygrohypnum styriacum (Limpr.) Broth. | hygrohypnum moss | Amblystegiaceae
|
| HYSUO | Hygrohypnum subeugyrium (Ren. & Card.) Broth. var. occidentale (Card. & Th�r.) Grout | Hygrohypnum luridum | Amblystegiaceae
|
| HYSU7 | Hygrohypnum subeugyrium (Ren. & Card.) Broth. | hygrohypnum moss | Amblystegiaceae
|
| HYGRO2 | Hygrohypnum Lindb. | hygrohypmum moss | Amblystegiaceae
|
| HYBR4 | Hygrophila brasiliensis (Spreng.) Lindau | Hygrophila costata | Acanthaceae
|
| HYCO8 | Hygrophila corymbosa (Blume) Lindau | starhorn | Acanthaceae
|
| HYCO9 | Hygrophila costata Nees | yerba de hicotea | Acanthaceae
|
| HYLA | Hygrophila lacustris (Schlecht. & Cham.) Nees | gulf swampweed | Acanthaceae
|
| HYPO3 | Hygrophila polysperma (Roxb.) T. Anders. | Indian swampweed | Acanthaceae
|
| HYPO4 | Hygrophila portoricensis Nees | Hygrophila costata | Acanthaceae
|
| HYTR6 | Hygrophila triflora (Roxburg) F.R. Fosberg & M.-H. Sachet | hygrophila | Acanthaceae
|
| HYGRO | Hygrophila R. Br. | swampweed | Acanthaceae
|
| HYCO17 | Hylocereus costaricensis (Weber) Britt. & Rose | Costa Rica nightblooming cactus | Cactaceae
|
| HYTR2 | Hylocereus trigonus (Haw.) Safford | strawberry-pear | Cactaceae
|
| HYUN3 | Hylocereus undatus (Haw.) Britt. & Rose | nightblooming cactus | Cactaceae
|
| HYLOC | Hylocereus (Berger) Britt. & Rose | nightblooming cactus | Cactaceae
|
| HYPY70 | Hylocomiastrum pyrenaicum (Spruce) Fleisch. in Broth. | hylocomiastrum moss | Hylocomiaceae
|
| HYUM2 | Hylocomiastrum umbratum (Hedw.) Fleisch. in Broth. | hylocomiastrum moss | Hylocomiaceae
|
| HYLOC3 | Hylocomiastrum Fleisch. in Broth. | hylocomiastrum moss | Hylocomiaceae
|
| HYAL5 | Hylocomium alaskanum (Lesq. & James) Aust. | Hylocomium splendens | Hylocomiaceae
|
| HYBR9 | Hylocomium brevirostre (Brid.) Schimp. in B.S.G. | Loeskeobryum brevirostre | Hylocomiaceae
|
| HYGI | Hylocomium giganteum Perss. nom. nud. non Bartr. | Hylocomium splendens | Hylocomiaceae
|
| HYPR8 | Hylocomium proliferum (Brid.) Lindb. | Hylocomium splendens | Hylocomiaceae
|
| HYPY71 | Hylocomium pyrenaicum (Spruce) Lindb. | Hylocomiastrum pyrenaicum | Hylocomiaceae
|
| HYSPA | Hylocomium splendens (Hedw.) Schimp. in B.S.G. var. alaskanum (Lesq. & James) Limpr. | Hylocomium splendens | Hylocomiaceae
|
| HYSPG | Hylocomium splendens (Hedw.) Schimp. in B.S.G. var. gracilius (Boul.) Husn. | Hylocomium splendens | Hylocomiaceae
|
| HYSPO | Hylocomium splendens (Hedw.) Schimp. in B.S.G. var. obtusifolium (Geh.) Par. | Hylocomium splendens | Hylocomiaceae
|
| HYSPT2 | Hylocomium splendens (Hedw.) Schimp. in B.S.G. var. tenue Sharp | Leptohymenium sharpii | Hylocomiaceae
|
| HYSP70 | Hylocomium splendens (Hedw.) Schimp. in B.S.G. | splendid feather moss | Hylocomiaceae
|
| HYUM3 | Hylocomium umbratum (Hedw.) Schimp. in B.S.G. | Hylocomiastrum umbratum | Hylocomiaceae
|
| HYLOC2 | Hylocomium Schimp. in B.S.G. | hylocomium feather moss | Hylocomiaceae
|
| HYER3 | Hylotelephium erythrostictum (Miq.) H. Ohba. | garden stonecrop | Crassulaceae
|
| HYSP9 | Hylotelephium spectabile (Boreau) H. Ohba. | showy stonecrop | Crassulaceae
|
| HYTE9 | Hylotelephium telephioides (Michx.) H. Ohba. | Allegheny stonecrop | Crassulaceae
|
| HYTEF | Hylotelephium telephium (L.) H. Ohba. ssp. fabaria (W.D.J. Koch) H. Ohba. | witch's moneybags | Crassulaceae
|
| HYTET2 | Hylotelephium telephium (L.) H. Ohba. ssp. telephium | witch's moneybags | Crassulaceae
|
| HYTE10 | Hylotelephium telephium (L.) H. Ohba. | witch's moneybags | Crassulaceae
|
| HYLOT | Hylotelephium H. Ohba. | stonecrop | Crassulaceae
|
| HYAC3 | Hymenachne acutigluma auct. non (Steud.) Gilliland | Hymenachne amplexicaulis | Poaceae
|
| HYAM2 | Hymenachne amplexicaulis (Rudge) Nees | West Indian marsh grass | Poaceae
|
| HYMEN8 | Hymenachne Beauv. | marsh grass | Poaceae
|
| HYCO | Hymenaea courbaril L. | stinkingtoe | Fabaceae
|
| HYVE8 | Hymenaea verrucosa Gaertner | East African copal | Fabaceae
|
| HYMEN | Hymenaea L. | hymenaea | Fabaceae
|
| HYNE2 | Hymenatherum neomexicanum Gray | Adenophyllum wrightii | Asteraceae
|
| HYPE5 | Hymenatherum pentachaetum DC. | Thymophylla pentachaeta var. pentachaeta | Asteraceae
|
| HYTA | Hymenatherum tagetoides (Torr. & Gray) Gray | Dysodiopsis tagetoides | Asteraceae
|
| HYAR8 | Hymenelia arctica (Lynge) Lutzoni | | Hymeneliaceae
|
| HYCE2 | Hymenelia ceracea (Arnold) Poelt & Vezda | Ionaspis lacustris | Hymeneliaceae
|
| HYEU4 | Hymenelia euplotica (Ach.) Lutzoni | | Hymeneliaceae
|
| HYHE5 | Hymenelia heteromorpha (Krempelh.) Lutzoni | | Hymeneliaceae
|
| HYLA12 | Hymenelia lacustris (With.) Choisy | Ionaspis lacustris | Hymeneliaceae
|
| HYME4 | Hymenelia melanocarpa (Krempelh.) Arnold | | Hymeneliaceae
|
| HYOC6 | Hymenelia ochrolemma (Vainio) Gowan & Ahti | Porpidia ochrolemma | Porpidiaceae
|
| HYRH | Hymenelia rhodopsis (Sommerf.) Lutzoni | | Hymeneliaceae
|
| HYMEN10 | Hymenelia Krempelh. | hymenelia | Hymeneliaceae
|
| HYBI3 | Hymenocallis bidentata Small | Hymenocallis rotata | Liliaceae
|
| HYCA19 | Hymenocallis caribaea (L.) Herbert | Caribbean spiderlily | Liliaceae
|
| HYCA9 | Hymenocallis caroliniana (L.) Herbert | Carolina spiderlily | Liliaceae
|
| HYCA17 | Hymenocallis caymanensis Herbert | Hymenocallis latifolia | Liliaceae
|
| HYCH | Hymenocallis choctawensis Traub ex J.E. Laferriere | Choctaw spiderlily | Liliaceae
|
| HYCO11 | Hymenocallis collieri Small | Hymenocallis latifolia | Liliaceae
|
| HYCO5 | Hymenocallis coronaria (Le Conte) Kunth | Hymenocallis caroliniana | Liliaceae
|
| HYCR | Hymenocallis crassifolia Herbert | Hymenocallis floridana | Liliaceae
|
| HYDE7 | Hymenocallis declinata (Jacq.) M. Roemer | Hymenocallis caribaea | Liliaceae
|
| HYDU | Hymenocallis duvalensis Traub ex J.E. Laferriere | Dixie spiderlily | Liliaceae
|
| HYEU | Hymenocallis eulae Shinners | Hymenocallis galvestonensis | Liliaceae
|
| HYEU5 | Hymenocallis eulae auct. non Shinners | Hymenocallis liriosme | Liliaceae
|
| HYEX2 | Hymenocallis expansa (Herbert) Herbert | West Indian spiderlily | Liliaceae
|
| HYFLA | Hymenocallis floridana (Raf.) Morton ssp. amplifolia Traub ex J.E. Laferriere | Hymenocallis floridana | Liliaceae
|
| HYFL3 | Hymenocallis floridana (Raf.) Morton | Florida spiderlily | Liliaceae
|
| HYGA2 | Hymenocallis galvestonensis (Herbert) Baker | Galveston spiderlily | Liliaceae
|
| HYGE2 | Hymenocallis georgiana Traub | Hymenocallis caroliniana | Liliaceae
|
| HYGO2 | Hymenocallis godfreyi G.L. Smith & M. Darst | Godfrey's spiderlily | Liliaceae
|
| HYHE2 | Hymenocallis henryae Traub ex J.E. Laferriere | Henry's spiderlily | Liliaceae
|
| HYHU | Hymenocallis humilis S. Wats. | Hymenocallis palmeri | Liliaceae
|
| HYKE | Hymenocallis keyensis Small | Hymenocallis latifolia | Liliaceae
|
| HYKI | Hymenocallis kimballiae Small | Hymenocallis latifolia | Liliaceae
|
| HYLA4 | Hymenocallis laciniata Small | Hymenocallis floridana | Liliaceae
|
| HYLA5 | Hymenocallis latifolia (P. Mill.) M. Roemer | perfumed spiderlily | Liliaceae
|
| HYLI | Hymenocallis liriosme (Raf.) Shinners | spring spiderlily | Liliaceae
|
| HYLI8 | Hymenocallis littoralis (Jacq.) Salisb. | beach spiderlily | Liliaceae
|
| HYMO7 | Hymenocallis moldenkiana Traub ex J.E. Laferriere | Hymenocallis galvestonensis | Liliaceae
|
| HYOC2 | Hymenocallis occidentalis (Le Conte) Kunth | Hymenocallis caroliniana | Liliaceae
|
| HYPA4 | Hymenocallis palmeri S. Wats. | alligatorlily | Liliaceae
|
| HYPA8 | Hymenocallis palusvirensis Traub ex J.E. Laferriere | Hymenocallis caroliniana | Liliaceae
|