High Quality Content by WIKIPEDIA articles! Ceanothus integerrimus is a woody shrub in the family Rhamnaceae, native to the western United States, in Arizona, New Mexico, California, Oregon, and Washington. It grows in chaparral mountain shrub regions, in hardwood forests of the west, and in fir, spruce, and Ponderosa Pine communities, being most abundant in chaparral in California. It is a deciduous shrub from 1-4 m tall with an open ascending to erect branch habit. It is a drought-tolerant phanerophyte. Nitrogen fixing actinomycete bacteria form root nodules on Ceanothus roots. Its stems are round yellow to a pale green in color with either small soft to straight stiff sharp hairs parallel to or in contact with the surface of the stem.

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