Genus
Ceanothus
Ceanothus velutinus laevigatus. Photo: (c) Alex Abair, some rights reserved (CC BY-NC)
Ceanothus is a genus of about 50–60 species of nitrogen-fixing shrubs and small trees in the buckthorn family (Rhamnaceae). Common names for members of this genus are buckbrush, California lilac, soap bush, or just ceanothus. “Ceanothus” comes from Ancient Greek: κεάνωθος (keanōthos), which was applied by Theophrastus (371–287 BC) to an Old World plant believed to be Cirsium arvense.
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