Plant Database (by name)

honey mesquite - Prosopis glandulosa Torr.

honeycup - Zenobia pulverulenta (Bartr. ex Willd.) Pollard

honeylocust - Gleditsia triacanthos L.

honeysuckle - Lonicera L.

honeyvine - Cynanchum laeve (Michx.) Pers.

honeyweed - Leonurus sibiricus L.

hood canarygrass - Phalaris paradoxa L.

Hood's sedge - Carex hoodii Boott

hooded arrowhead - Sagittaria calycina Engelm. var. calycina

hooded arrowhead - Sagittaria calycina Engelm. var. spongiosa Engelm.

hooded coralroot - Corallorhiza striata Lindl.

hooded coralroot - Corallorhiza striata Lindl. var. striata

hooded ladies'-tresses - Spiranthes romanzoffiana Cham.

hooded pitcherplant - Sarracenia minor Walt.

hooded windmill grass - Chloris cucullata Bisch.

hooked bristlegrass - Setaria verticillata (L.) Beauv.

hooked pincushionplant - Navarretia hamata Greene

hookedspur violet - Viola adunca Sm.

hookedspur violet - Viola adunca Sm. var. adunca

hookedspur violet - Viola adunca Sm. var. oxyceras (S. Wats.) S. Wats. ex Jepson

Hooker inula - Inula hookeri C.B. Clarke

Hooker's balsamroot - Balsamorhiza hookeri Nutt.

Hooker's eryngo - Eryngium hookeri Walp.

Hooker's evening-primrose - Oenothera elata Kunth

Hooker's evening-primrose - Oenothera elata Kunth ssp. hirsutissima (Gray ex S. Wats.) W. Dietr.

Hooker's mountain-avens - Dryas octopetala L. ssp. hookeriana (Juz.) Hultén

Hooker's orchid - Platanthera hookeri (Torr. ex Gray) Lindl.

Hooker's sandwort - Arenaria hookeri Nutt.

Hooker's silene - Silene hookeri Nutt.

Hooker's silene - Silene hookeri Nutt. ssp. hookeri

hookeria moss - Hookeria lucens (Hedw.) Sm.

Hoover's bentgrass - Agrostis hooveri Swallen

hop sedge - Carex lupulina Muhl. ex Willd.

hophornbeam - Ostrya virginiana (P. Mill.) K. Koch

Hopi tea greenthread - Thelesperma megapotamicum (Spreng.) Kuntze

Hoppner's sedge - Carex subspathacea Wormsk. ex Hornem.

hoptree - Ptelea L.

horehound - Marrubium vulgare L.

horn calcareous moss - Mnium hornum Hedw.

horn nut - Trapa bicornis Osbeck

horned bladderwort - Utricularia cornuta Michx.

horned pondweed - Zannichellia palustris L.

horned spurge - Euphorbia brachycera Engelm.

Hornemann's willowherb - Epilobium hornemannii Reichenb.

hornleaf riverweed - Podostemum ceratophyllum Michx.

Hornschuch's pseudocrossidium moss - Pseudocrossidium hornschuchianum (Schultz) Zand.

horse chestnut - Aesculus hippocastanum L.

horse crippler - Echinocactus texensis Hopffer

horseflyweed - Baptisia tinctoria (L.) R. Br. ex Ait. f.

B. Mey. & Scherb. - Armoracia rusticana P.G. Gaertn.