Ceanothus prostratus is a species of shrub in the buckthorn family Rhamnaceae known by the common names prostrate ceanothus and mahala mat. It is native to the Pacific Northwest of the United States, into northern California and Nevada, where it grows in coniferous forest and open plateau.
This is a flat, mat-forming shrub growing up to about 2.5 meters wide. The evergreen leaves are oppositely arranged, oval in shape with several large, sharp teeth along the edges. The upper surface is green and hairless, and the underside is paler in color and feltlike in texture. The inflorescence is a small cluster of deep blue or purple flowers. The fruit is a wrinkled capsule one half to one centimeter long.
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