| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| HYCAM2 | Hypericum canadense L. var. majus Gray | Hypericum majus | Clusiaceae
|
| HYCA7 | Hypericum canadense L. | lesser Canadian St. Johnswort | Clusiaceae
|
| HYCA11 | Hypericum canariense L. | Canary Island St. Johnswort | Clusiaceae
|
| HYCH2 | Hypericum chapmanii P. Adams | Apalachicola St. Johnswort | Clusiaceae
|
| HYCI | Hypericum cistifolium Lam. | roundpod St. Johnswort | Clusiaceae
|
| HYCO3 | Hypericum concinnum Benth. | goldwire | Clusiaceae
|
| HYCR3 | Hypericum crux-andreae (L.) Crantz | St. Peterswort | Clusiaceae
|
| HYCU | Hypericum cumulicola (Small) P. Adams | highlands scrub St. Johnswort | Clusiaceae
|
| HYDE4 | Hypericum degeneri Fosberg | Hypericum parvulum | Clusiaceae
|
| HYDEL | Hypericum densiflorum Pursh var. lobocarpum (Gattinger) Svens. | Hypericum lobocarpum | Clusiaceae
|
| HYDE | Hypericum densiflorum Pursh | bushy St. Johnswort | Clusiaceae
|
| HYDEA | Hypericum denticulatum Walt. var. acutifolium (Ell.) Blake | Hypericum acutifolium | Clusiaceae
|
| HYDEO | Hypericum denticulatum Walt. var. ovalifolium (Britt.) Blake | Hypericum denticulatum | Clusiaceae
|
| HYDER | Hypericum denticulatum Walt. var. recognitum Fern. & Schub. | Hypericum acutifolium | Clusiaceae
|
| HYDE2 | Hypericum denticulatum Walt. | coppery St. Johnswort | Clusiaceae
|
| HYDI | Hypericum diosmoides Griseb. | Puerto Rico St. Johnswort | Clusiaceae
|
| HYDI2 | Hypericum dissimulatum Bickn. | disguised St. Johnswort | Clusiaceae
|
| HYDO | Hypericum dolabriforme Vent. | straggling St. Johnswort | Clusiaceae
|
| HYDR | Hypericum drummondii (Grev. & Hook.) Torr. & Gray | nits and lice | Clusiaceae
|
| HYED | Hypericum edisonianum (Small) P. Adams & Robson | Arcadian St. Johnswort | Clusiaceae
|
| HYEL | Hypericum ellipticum Hook. | pale St. Johnswort | Clusiaceae
|
| HYEX | Hypericum exile P. Adams | Florida Sands St. Johnswort | Clusiaceae
|
| HYFA | Hypericum fasciculatum Lam. | peelbark St. Johnswort | Clusiaceae
|
| HYFOS2 | Hypericum formosum Kunth ssp. scouleri (Hook.) C.L. Hitchc. | Hypericum scouleri ssp. scouleri | Clusiaceae
|
| HYFON | Hypericum formosum Kunth var. nortoniae (M.E. Jones) C.L. Hitchc. | Hypericum scouleri ssp. nortoniae | Clusiaceae
|
| HYFOS | Hypericum formosum Kunth var. scouleri (Hook.) Coult. | Hypericum scouleri ssp. scouleri | Clusiaceae
|
| HYFR | Hypericum frondosum Michx. | cedarglade St. Johnswort | Clusiaceae
|
| HYGAP | Hypericum galioides Lam. var. pallidum C. Mohr | Hypericum galioides | Clusiaceae
|
| HYGA | Hypericum galioides Lam. | bedstraw St. Johnswort | Clusiaceae
|
| HYGE | Hypericum gentianoides (L.) B.S.P. | orangegrass | Clusiaceae
|
| HYGL3 | Hypericum glomeratum Small | Hypericum densiflorum | Clusiaceae
|
| HYGR2 | Hypericum gramineum G. Forst. | grassy St. Johnswort | Clusiaceae
|
| HYGR3 | Hypericum graveolens Buckl. | mountain St. Johnswort | Clusiaceae
|
| HYGY | Hypericum gymnanthum Engelm. & Gray | claspingleaf St. Johnswort | Clusiaceae
|
| HYHA | Hypericum harperi R. Keller | sharplobe St. Johnswort | Clusiaceae
|
| HYHU2 | Hypericum humifusum L. | trailing St. Johnswort | Clusiaceae
|
| HYHYH | Hypericum hypericoides (L.) Crantz ssp. hypericoides | St. Andrew's cross | Clusiaceae
|
| HYHYM | Hypericum hypericoides (L.) Crantz ssp. multicaule (Michx. ex Willd.) Robson | St. Andrew's cross | Clusiaceae
|
| HYHYM2 | Hypericum hypericoides (L.) Crantz var. multicaule (Michx. ex Willd.) Fosberg | Hypericum hypericoides ssp. multicaule | Clusiaceae
|
| HYHY | Hypericum hypericoides (L.) Crantz | St. Andrew's cross | Clusiaceae
|
| HYKA | Hypericum kalmianum L. | Kalm's St. Johnswort | Clusiaceae
|
| HYLI4 | Hypericum lissophloeus P. Adams | smoothbark St. Johnswort | Clusiaceae
|
| HYLL | Hypericum lloydii (Svens.) P. Adams | sandhill St. Johnswort | Clusiaceae
|
| HYLO2 | Hypericum lobocarpum Gattinger | fivelobe St. Johnswort | Clusiaceae
|
| HYMA2 | Hypericum majus (Gray) Britt. | large St. Johnswort | Clusiaceae
|
| HYMI4 | Hypericum microsepalum (Torr. & Gray) Gray ex S. Wats. | flatwoods St. Johnswort | Clusiaceae
|
| HYMI | Hypericum mitchellianum Rydb. | Blue Ridge St. Johnswort | Clusiaceae
|
| HYMO2 | Hypericum �moserianum Luquet ex Andr� | | Clusiaceae
|
| HYMUB | Hypericum mutilum L. ssp. boreale (Britt.) J. Gillett | Hypericum boreale | Clusiaceae
|
| HYMUL | Hypericum mutilum L. var. latisepalum Fern. | Hypericum mutilum | Clusiaceae
|
| HYMUP | Hypericum mutilum L. var. parviflorum (Willd.) Fern. | Hypericum mutilum | Clusiaceae
|
| HYMU | Hypericum mutilum L. | dwarf St. Johnswort | Clusiaceae
|
| HYMY | Hypericum myrtifolium Lam. | myrtleleaf St. Johnswort | Clusiaceae
|
| HYNI3 | Hypericum nitidum Lam. | Carolina St. Johnswort | Clusiaceae
|
| HYNO2 | Hypericum nortoniae M.E. Jones | Hypericum scouleri ssp. nortoniae | Clusiaceae
|
| HYNU | Hypericum nudiflorum Michx. ex Willd. | early St. Johnswort | Clusiaceae
|
| HYOK | Hypericum oklahomense Palmer | Hypericum lobocarpum | Clusiaceae
|
| HYOP | Hypericum opacum Torr. & Gray | Hypericum cistifolium | Clusiaceae
|
| HYPA6 | Hypericum parvulum Greene | Sierra Madre St. Johnswort | Clusiaceae
|
| HYPA2 | Hypericum pauciflorum Kunth | fewflower St. Johnswort | Clusiaceae
|
| HYPE | Hypericum perforatum L. | common St. Johnswort | Clusiaceae
|
| HYPE6 | Hypericum petiolatum Walt., non L. | Triadenum walteri | Clusiaceae
|
| HYPR | Hypericum prolificum L. | shrubby St. Johnswort | Clusiaceae
|
| HYPS | Hypericum pseudomaculatum Bush | false spotted St. Johnswort | Clusiaceae
|
| HYPUP | Hypericum punctatum Lam. var. pseudomaculatum (Bush) Fern. | Hypericum pseudomaculatum | Clusiaceae
|
| HYPU | Hypericum punctatum Lam. | spotted St. Johnswort | Clusiaceae
|
| HYPY | Hypericum pyramidatum Ait. | Hypericum ascyron | Clusiaceae
|
| HYRE3 | Hypericum reductum (Svens.) P. Adams | Atlantic St. Johnswort | Clusiaceae
|
| HYSCN | Hypericum scouleri Hook. ssp. nortoniae (M.E. Jones) J. Gillett | Norton's St. Johnswort | Clusiaceae
|
| HYSCS2 | Hypericum scouleri Hook. ssp. scouleri | Scouler's St. Johnswort | Clusiaceae
|
| HYSC5 | Hypericum scouleri Hook. | Scouler's St. Johnswort | Clusiaceae
|
| HYSE | Hypericum setosum L. | hairy St. Johnswort | Clusiaceae
|
| HYSP5 | Hypericum spathulatum (Spach) Steud. | Hypericum prolificum | Clusiaceae
|
| HYSPT | Hypericum sphaerocarpum Michx. var. turgidum (Small) Svens. | Hypericum sphaerocarpum | Clusiaceae
|
| HYSP2 | Hypericum sphaerocarpum Michx. | roundseed St. Johnswort | Clusiaceae
|
| HYSP3 | Hypericum splendens Small | Hypericum frondosum | Clusiaceae
|
| HYST3 | Hypericum stans (Michx. ex Willd.) P. Adams & Robson | Hypericum crux-andreae | Clusiaceae
|
| HYST4 | Hypericum stragulum P. Adams & Robson | Hypericum hypericoides ssp. multicaule | Clusiaceae
|
| HYSU4 | Hypericum subpetiolatum Bickn. ex Small | Hypericum punctatum | Clusiaceae
|
| HYSU2 | Hypericum suffruticosum P. Adams & Robson | pineland St. Johnswort | Clusiaceae
|
| HYTE4 | Hypericum tetrapetalum Lam. | fourpetal St. Johnswort | Clusiaceae
|
| HYTUW | Hypericum tubulosum Walt. var. walteri (J.G. Gmel.) Lott | Triadenum walteri | Clusiaceae
|
| HYTU5 | Hypericum tubulosum Walt. | Triadenum tubulosum | Clusiaceae
|
| HYTU4 | Hypericum turgidum Small | Hypericum sphaerocarpum | Clusiaceae
|
| HYVI6 | Hypericum virgatum Lam. | Hypericum denticulatum | Clusiaceae
|
| HYVIF | Hypericum virginicum L. var. fraseri (Spach) Fern. | Triadenum fraseri | Clusiaceae
|
| HYVI4 | Hypericum virginicum L. | Triadenum virginicum | Clusiaceae
|
| HYWA | Hypericum walteri J.G. Gmel. | Triadenum walteri | Clusiaceae
|
| HYPER | Hypericum L. | St. Johnswort | Clusiaceae
|
| HYAD2 | Hyperphyscia adglutinata (Florke) H. Mayrh. & Poelt | | Physciaceae
|
| HYMI7 | Hyperphyscia minor (Fee) D. D. Awasthi | | Physciaceae
|
| HYSY | Hyperphyscia syncolla (Tuck. ex Nyl.) Kalb | | Physciaceae
|
| HYPER3 | Hyperphyscia Mull. Arg. | hyperphyscia | Physciaceae
|
| HYTH2 | Hyphaene thebaica (L.) C. Martius | doum palm | Arecaceae
|
| HYPHA | Hyphaene Gaertner | hyphaene | Arecaceae
|
| HYAB | Hypnum abietinum Hedw. | Abietinella abietina | Thuidiaceae
|
| HYAN5 | Hypnum andoi A. J. E. Sm. | Hypnum mammillatum | Hypnaceae
|
| HYARA2 | Hypnum arcuatum Lindb. var. americanum Ren. & Card. | Hypnum lindbergii | Hypnaceae
|
| HYARD5 | Hypnum arcuatum Lindb. var. demissum Schimp. | Hypnum lindbergii | Hypnaceae
|
| HYARE | Hypnum arcuatum Lindb. var. elatum Schimp. | Hypnum lindbergii | Hypnaceae
|
| HYAR7 | Hypnum arcuatum Lindb. | Hypnum lindbergii | Hypnaceae
|