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hairy vetch (2)
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hare barley (2)
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Heal All (3)
Heal-all (5)

Healall (3)
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Heart-leaved Keckiella (26)
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heartleaf twistflower (1)
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Hidden Lake Bluecurls (14)
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Hoe A Maui (maui's Paddle) (6)
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Hoffmann's Oreocarya (2)
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Hoffmann's Rockcress (6)
Hoffmann's Sanicle (18)
Hoffmann's Slender-flowered Gilia (2)

Hoffmann's Snakeroot (11)
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Holboell's Rockcress (25)
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Holly Oak (13)
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Holly-leaf Cherry (42)
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Hollyfern (3)
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Hollyleaf Cherry (35)
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Hollyleaf Gilia (47)
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Holm Oak (20)
Holm's Ragwort (8)
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Honohono (10)
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Hooded (2)
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Hooked-fruit Buttercup (5)
hooked-fruit buttercup (1)
Hookedspur Violet (34)
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Hop (4)
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Howell Pogogyne (6)
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Howell's Lewisia (50)
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Huachuca Mountain Lupine (usda) (2)
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Hualtata (2)
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Huasna Bushmallow (67)
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Huata (1)
Hubby's Phacelia (9)
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Huchachago (11)
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Huckleberry Oak (32)
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Humboldt County Fuchsia (8)
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Humboldt County Wyethia (5)
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Humboldt Lily (71)
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Humboldt Milkvetch (3)
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Humboldt River Milkvetch (23)
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Humboldt's Lily (95)
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Hungarian Bear's Breeches (2)
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Hungarian X Great Yellow Gentian (1)
Hunt's Clarkia (3)
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Huon Pine (2)
Hupa Gooseberry (1)
Hupa gooseberry (1)
Hureim (3)
Huron Bog Orchid (5)
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Hutchison's Lewisia (70)
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Hyacinth (5)
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Hyalineherb (9)
Hybrid Between Burnt-tip And Three-toothed Orchid (3)
Hybrid Between Fragrant And Vanillia Orchid (4)
Hybrid Black-poplar (2)
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Hybrid Closed Gentian (6)
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Hybrid Foxglove (3)
Hybrid Holly (5)
Hybrid Iris (5)
Hybrid Iris 'giuseppe Verdi' (2)
Hybrid Iris 'quick Step' (3)
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Hybrid Iris Akademik Korolyov (4)
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Hybrid Iris Margarita (2)
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Hybrid Iris Melody Lane (3)
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Hybrid Iris Supersitution (2)
Hybrid Iris Swassi Princess (3)
Hybrid Iris War Chief (4)
Hybrid Iris Winners Circle (2)
Hybrid Island Bush Monkeyflower (3)
Hybrid Keckiella (26)
Hybrid Knapweed (2)
Hybrid Lily (15)
Hybrid Oak (8)
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Hybrid Paintbrush (2)
Hybrid Phalaenopsis (1)
Hybrid Pincushion (9)
Hybrid Plumeless Thistle (4)
Hybrid Red Sand-verbena (14)
Hybrid Silky Balsamroot (8)
Hybrid Sticky Monkeyflower (1)
Hybrid Sumac (3)
Hybrid Verbena (4)
Hybrid Wildrye (3)

Hydra Blazingstar (1)
Hydra Stick-leaf (2)
Hydrangea (2)
Hydrilla (24)
Hymenopappus (9)
Hypericum (1)
Hypoxis (1)
Hyssop (1)
Hyssop Looseestrife (2)
Hyssop Loosestrife (29)
Hyssop-leaved Loosestrife (1)
Hyssopleaf Thoroughwort (3)