Ceanothus oliganthus is a species of shrub in the buckthorn family Rhamnaceae known by the common name hairy ceanothus, or hairy-leaf ceanothus. The variety of this species known as jimbrush (var. sorediatus) is sometimes treated as a separate species.

It occurs in California and Baja California, where it occurs through all of the coastal mountain ranges in dry habitat such as chaparral.

This is a large, erect shrub approaching 3 meters in maximum height.

The stipules (small leaf-like structures on the stems at the base of the leaf stem, are thin and fall off early. The evergreen leaves are alternately arranged and may be up to 4 centimeters long. They are dark green on top, paler and hairy on the underside,  and are edged with glandular teeth. 

Leaves have 3 main veins rising from the base. Leaves have a toothed edge. The leaf is covered with short, soft hairs on the top.

Branchlets are flexible, not stiff.

The inflorescence is a cluster or series of clusters of blue or purple flowers.

The fruit is a capsule which may be hairy or not, depending on variety.

The fruit is not horned.

It blooms April to May

Observations Map

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