| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| HYPY2 | Hymenocallis pygmaea Traub | Hymenocallis palmeri | Liliaceae
|
| HYRO2 | Hymenocallis rotata (Ker-Gawl.) Herbert | streambank spiderlily | Liliaceae
|
| HYSP10 | Hymenocallis speciosa (Salisb.) Salisb. | | Liliaceae
|
| HYTR5 | Hymenocallis traubii Moldenke | Hymenocallis rotata | Liliaceae
|
| HYTR4 | Hymenocallis tridentata Small | Hymenocallis floridana | Liliaceae
|
| HYMEN2 | Hymenocallis Salisb. | spiderlily | Liliaceae
|
| HYTR3 | Hymenochaeta triqueter (L.) Nakai | Schoenoplectus triqueter | Cyperaceae
|
| HYFA2 | Hymenoclea fasciculata A. Nels. | Hymenoclea salsola var. fasciculata | Asteraceae
|
| HYMO | Hymenoclea monogyra Torr. & Gray ex Gray | singlewhorl burrobrush | Asteraceae
|
| HYPE4 | Hymenoclea pentalepis Rydb. | Hymenoclea salsola var. pentalepis | Asteraceae
|
| HYSAF | Hymenoclea salsola Torr. & Gray ex Gray var. fasciculata (A. Nels.) K.M. Peterson & Payne | burrobrush | Asteraceae
|
| HYSAP2 | Hymenoclea salsola Torr. & Gray ex Gray var. patula (A. Nels.) K.M. Peterson & Payne | Hymenoclea salsola var. fasciculata | Asteraceae
|
| HYSAP | Hymenoclea salsola Torr. & Gray ex Gray var. pentalepis (Rydb.) L. Benson | burrobrush | Asteraceae
|
| HYSAS | Hymenoclea salsola Torr. & Gray ex Gray var. salsola | burrobrush | Asteraceae
|
| HYSA | Hymenoclea salsola Torr. & Gray ex Gray | burrobrush | Asteraceae
|
| HYSA2 | Hymenoclea sandersonii (Welsh) N. Holmgren | Sanderson's burrobrush | Asteraceae
|
| HYMEN3 | Hymenoclea Torr. & Gray ex Gray | burrobrush | Asteraceae
|
| HYCR4 | Hymenodium crinitum (L.) F�e | Elaphoglossum crinitum | Dryopteridaceae
|
| HYPR3 | Hymenolobus procumbens (L.) Nutt. ex Schinz & Thellung | Hutchinsia procumbens | Brassicaceae
|
| HYAR6 | Hymenopappus arenosus Heller | Hymenopappus filifolius var. cinereus | Asteraceae
|
| HYARA | Hymenopappus artemisiifolius DC. var. artemisiifolius | oldplainsman | Asteraceae
|
| HYARR2 | Hymenopappus artemisiifolius DC. var. riograndensis B.L. Turner | oldplainsman | Asteraceae
|
| HYAR3 | Hymenopappus artemisiifolius DC. | oldplainsman | Asteraceae
|
| HYBI | Hymenopappus biennis B.L. Turner | biennial woollywhite | Asteraceae
|
| HYCA14 | Hymenopappus carolinensis (Lam.) Porter | Hymenopappus scabiosaeus var. scabiosaeus | Asteraceae
|
| HYCA18 | Hymenopappus carrizoanus B.L. Turner | Carrizo Sands woollywhite | Asteraceae
|
| HYCI4 | Hymenopappus cinereus Rydb. | Hymenopappus filifolius var. cinereus | Asteraceae
|
| HYCO10 | Hymenopappus corymbosus Torr. & Gray | Hymenopappus scabiosaeus var. corymbosus | Asteraceae
|
| HYER | Hymenopappus eriopodus A. Nels. | Hymenopappus filifolius var. eriopodus | Asteraceae
|
| HYFIA | Hymenopappus filifolius Hook. var. alpestris (Maguire) Shinners | Hymenopappus filifolius var. nudipes | Asteraceae
|
| HYFIC | Hymenopappus filifolius Hook. var. cinereus (Rydb.) I.M. Johnston | fineleaf hymenopappus | Asteraceae
|
| HYFIE | Hymenopappus filifolius Hook. var. eriopodus (A. Nels.) B.L. Turner | fineleaf hymenopappus | Asteraceae
|
| HYFIF | Hymenopappus filifolius Hook. var. filifolius | fineleaf hymenopappus | Asteraceae
|
| HYFII | Hymenopappus filifolius Hook. var. idahoensis B.L. Turner | fineleaf hymenopappus | Asteraceae
|
| HYFIL | Hymenopappus filifolius Hook. var. lugens (Greene) Jepson | Idaho hymenopappus | Asteraceae
|
| HYFIL2 | Hymenopappus filifolius Hook. var. luteus (Nutt.) B.L. Turner | fineleaf hymenopappus | Asteraceae
|
| HYFIM | Hymenopappus filifolius Hook. var. megacephalus B.L. Turner | fineleaf hymenopappus | Asteraceae
|
| HYFIN | Hymenopappus filifolius Hook. var. nanus (Rydb.) B.L. Turner | fineleaf hymenopappus | Asteraceae
|
| HYFIN2 | Hymenopappus filifolius Hook. var. nudipes (Maguire) B.L. Turner | alpine hymenopappus | Asteraceae
|
| HYFIP2 | Hymenopappus filifolius Hook. var. parvulus (Greene) B.L. Turner | fineleaf hymenopappus | Asteraceae
|
| HYFIP | Hymenopappus filifolius Hook. var. pauciflorus (I.M. Johnston) B.L. Turner | fineleaf hymenopappus | Asteraceae
|
| HYFIP3 | Hymenopappus filifolius Hook. var. polycephalus (Osterhout) B.L. Turner | manyhead hymenopappus | Asteraceae
|
| HYFIT | Hymenopappus filifolius Hook. var. tomentosus (Rydb.) B.L. Turner | finehair hymenopappus | Asteraceae
|
| HYFI | Hymenopappus filifolius Hook. | fineleaf hymenopappus | Asteraceae
|
| HYFLC | Hymenopappus flavescens Gray var. canotomentosus Gray | collegeflower | Asteraceae
|
| HYFLF | Hymenopappus flavescens Gray var. flavescens | collegeflower | Asteraceae
|
| HYFL | Hymenopappus flavescens Gray | collegeflower | Asteraceae
|
| HYGL4 | Hymenopappus gloriosus Heller | Hymenopappus filifolius var. lugens | Asteraceae
|
| HYLU3 | Hymenopappus lugens Greene | Hymenopappus filifolius var. lugens | Asteraceae
|
| HYLU2 | Hymenopappus luteus Nutt. | Hymenopappus filifolius var. luteus | Asteraceae
|
| HYME | Hymenopappus mexicanus Gray | Mexican woollywhite | Asteraceae
|
| HYNE | Hymenopappus newberryi (Gray) I.M. Johnston | Newberry's hymenopappus | Asteraceae
|
| HYPA7 | Hymenopappus pauciflorus I.M. Johnston | Hymenopappus filifolius var. pauciflorus | Asteraceae
|
| HYPO5 | Hymenopappus polycephalus Osterhout | Hymenopappus filifolius var. polycephalus | Asteraceae
|
| HYRA2 | Hymenopappus radiatus Rose | ray hymenopappus | Asteraceae
|
| HYRO5 | Hymenopappus robustus Greene | Hymenopappus flavescens var. canotomentosus | Asteraceae
|
| HYSCA2 | Hymenopappus scabiosaeus L'H�r. var. artemisiifolius (DC.) Gandhi & Thomas | Hymenopappus artemisiifolius var. artemisiifolius | Asteraceae
|
| HYSCC | Hymenopappus scabiosaeus L'H�r. var. corymbosus (Torr. & Gray) B.L. Turner | Carolina woollywhite | Asteraceae
|
| HYSCR | Hymenopappus scabiosaeus L'H�r. var. riograndensis (B.L. Turner) Gandhi | Hymenopappus artemisiifolius var. riograndensis | Asteraceae
|
| HYSCS | Hymenopappus scabiosaeus L'H�r. var. scabiosaeus | Carolina woollywhite | Asteraceae
|
| HYSC | Hymenopappus scabiosaeus L'H�r. | Carolina woollywhite | Asteraceae
|
| HYTE2 | Hymenopappus tenuifolius Pursh | Chalk Hill hymenopappus | Asteraceae
|
| HYMEN4 | Hymenopappus L'H�r. | hymenopappus | Asteraceae
|
| HYAS | Hymenophyllum asplenioides (Sw.) Sw. | Caribbean filmy fern | Hymenophyllaceae
|
| HYAX | Hymenophyllum axillare Sw. | axillary filmy fern | Hymenophyllaceae
|
| HYBA2 | Hymenophyllum baldwinii D.C. Eat. | Trichomanes bauerianum | Hymenophyllaceae
|
| HYBR6 | Hymenophyllum brevifrons Kunze | Antilles filmy fern | Hymenophyllaceae
|
| HYCI2 | Hymenophyllum ciliatum (Sw.) Sw. | Hymenophyllum hirsutum | Hymenophyllaceae
|
| HYCO4 | Hymenophyllum contortum Bosch | Hymenophyllum fendlerianum | Hymenophyllaceae
|
| HYCR2 | Hymenophyllum crispum auct. non Kunth | Hymenophyllum fendlerianum | Hymenophyllaceae
|
| HYDE6 | Hymenophyllum decurrens (Jacq.) Sw. | Sierra de Luquillo filmy fern | Hymenophyllaceae
|
| HYELP | Hymenophyllum elegantulum Bosch var. petiolulatum Morton | Hymenophyllum tegularis | Hymenophyllaceae
|
| HYEL3 | Hymenophyllum elegantulum Bosch | Hymenophyllum tegularis | Hymenophyllaceae
|
| HYFE2 | Hymenophyllum fendlerianum Sturm | twisted filmy fern | Hymenophyllaceae
|
| HYFR2 | Hymenophyllum fragile (Hedw.) Morton | fragile filmy fern | Hymenophyllaceae
|
| HYFU | Hymenophyllum fucoides (Sw.) Sw. | graceful filmy fern | Hymenophyllaceae
|
| HYHI3 | Hymenophyllum hirsutum (L.) Sw. | hairy filmy fern | Hymenophyllaceae
|
| HYLA3 | Hymenophyllum lanatum F�e | woolly filmy fern | Hymenophyllaceae
|
| HYLA2 | Hymenophyllum lanceolatum Hook. & Arn. | palaihinahina | Hymenophyllaceae
|
| HYLI2 | Hymenophyllum lineare (Sw.) Sw. | longtom filmy fern | Hymenophyllaceae
|
| HYMA3 | Hymenophyllum macrothecum F�e | mountain filmy fern | Hymenophyllaceae
|
| HYMI3 | Hymenophyllum microcarpum Desv. | creeping filmy fern | Hymenophyllaceae
|
| HYOB | Hymenophyllum obtusum Hook. & Arn. | palailaulii | Hymenophyllaceae
|
| HYPA5 | Hymenophyllum paucicarpum Jenman | Jamaican filmy fern | Hymenophyllaceae
|
| HYPOP2 | Hymenophyllum polyanthos (Sw.) Sw. var. protrusum (Hook.) Farw. | Hymenophyllum decurrens | Hymenophyllaceae
|
| HYPO | Hymenophyllum polyanthos (Sw.) Sw. | smooth filmy fern | Hymenophyllaceae
|
| HYPR2 | Hymenophyllum protrusum Hook. | Hymenophyllum decurrens | Hymenophyllaceae
|
| HYRE | Hymenophyllum recurvum Gaud. | ohiaku | Hymenophyllaceae
|
| HYSI2 | Hymenophyllum sieberi (K. Presl) Bosch | Sieber's filmy fern | Hymenophyllaceae
|
| HYTA3 | Hymenophyllum tayloriae Farrar & Raine | Taylor's filmy fern | Hymenophyllaceae
|
| HYTE7 | Hymenophyllum tegularis (Desv.) Proctor & Lourteig | elegant filmy fern | Hymenophyllaceae
|
| HYTU2 | Hymenophyllum tunbrigense (L.) Sm. | Tunbridge filmy fern | Hymenophyllaceae
|
| HYUN2 | Hymenophyllum undulatum (Sw.) Sw. | wavy filmy fern | Hymenophyllaceae
|
| HYWR2 | Hymenophyllum wrightii Bosch | Wright's filmy fern | Hymenophyllaceae
|
| HYMEN5 | Hymenophyllum Sm. | filmy fern | Hymenophyllaceae
|
| HYPU5 | Hymenophysa pubescens C.A. Mey. | Cardaria pubescens | Brassicaceae
|
| HYIN6 | Hymenostomum inoperculatum Crum | Weissia inoperculata | Pottiaceae
|
| HYMI9 | Hymenostomum microstomum (Hedw.) R. Br. | Weissia hedwigii | Pottiaceae
|
| HYRO7 | Hymenostomum rostellatum auct. Amer. | Astomum ludovicianum | Pottiaceae
|
| HYTO3 | Hymenostomum tortile (Schwaegr.) Bruch & Schimp in B.S.G. | Weissia condensa | Pottiaceae
|
| HYCU3 | Hymenostylium curvirostre Mitt. | Hymenostylium recurvirostre | Pottiaceae
|