H

Hairyleaf ceanothus (Ceanothus oliganthus)
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Hawkweed (Hieracium argutum)
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Heartleaf penstemon (Keckiella cordifolia)
   Picture 1

Hedge mustard* (Sisymbrium officinale)
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Hedge nettle (Stachys bullata)
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Hoaryleaf ceanothus (Ceanothus crassifolius)
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   Picture 2

Hollyleaf cherry (Prunus ilicifolia)
   Picture 1
   Picture 2
   Picture 3

Hollyleaf redberry (Rhamnus ilicifolia)
   Picture 1

Horehound* (Marrubium vulgare)
   Picture 1
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Horseweed (Conyza canadensis)
   Picture 1
   Picture 2

Humboldt lily (Lilium humboldtii)
   Picture 1
   Picture 2

Hummingbird sage [= Crimson pitcher sage] (Salvia spathacea)
   Picture 1
   Picture 2