blue oak

Quercus douglasii

Member of white oaks (section Quercus)
high-latitude oaks (subgenus Quercus)
oaks (genus Quercus)
beech family (family Fagaceae)
dicots (class Magnoliopsida)
other colors in flowering plants

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• leaf:
• adaxially dull, blue-green
• abaxially puberulent, pale blue-green
• tip generally rounded
• margin ± entire, wavy, or ± shallowly lobed (sinuses < 50% to midrib), without spines
• acorn cap less deep than wide
• common

Toxicity of acorn, oak (Quercus spp.):
1 – Skin contact with these plants can cause symptoms ranging from redness, itching, and rash to painful blisters like skin burns.
3 – Ingestion of these plants is expected to cause nausea, vomiting, diarrhea and other symptoms that may cause illness but is not life-threatening.

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Chris’s observations: 3 (2 are research grade)

Locations:

• Almaden Quicksilver CP
• Fremont Older OSP
• Mt. Diablo SP

Months:

• Apr.: 1
• May: 0
• Jun.: 0
• Jul.: 0
• Aug.: 0
• Sep.: 1
• Oct.: 0
• Nov.: 1

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Taxon info: iNaturalist – Calflora – CalPhotos – Jepson eFlora – FNA

Bay Area species: iNaturalist – Calflora