- Hairy ceanothus
- Hairy tridens
- Hare's tail grass
- Harvest brodiaea
- Hayfield tarweed
- Picture 1
- Picture 2
- Hearst's ceanothus
- Picture 1 (Rare)
- Picture 2
- Picture 3
- Picture 4
- Heart-leaved penstemon
- Picture 1
- Picture 2
- Hedge nettle
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Picture 6
- Heliotrope
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Henbit
- High mallow
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Hill morning glory
- Picture 1
- Picture 2
- Himalayan blackberry
- Picture 1
- Picture 2
- Picture 3
- Hoary cress
- Hoary-leaved ceanothus
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Picture 6
- Picture 7
- Picture 8
- Picture 9
- Picture 10
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- Holly-leaf redberry
- Picture 1
- Picture 2
- Picture 3 (fruits)
- Holly-leafed cherry
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Hooker's evening primrose
- Picture 1
- Picture 2
- Picture 3
- Horehound
- Horkelia
- Picture 1
- Picture 2
- Picture 3
- Horsetail
- Picture 1
- Picture 2 (vegetative)
- Picture 3
- Hottentot fig
- Picture 1
- Picture 2
- Picture 3
- Hound's tongue
- Humboldt lily
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
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