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Ceanothus is a genus of about 50–60 species of nitrogen-fixing shrubs and small trees in the buckthorn family (). [3] [4] [2] [5] Common names for members of this genus are buckbrush, California lilac, soap bush, or just ceanothus.
The flowers are a very distinctive brilliant blue. Compared to other local species like Ceanothus tomentosus, this species has larger leaves and does not have the conspicuous black glands on the teethed edges of the leaf margin. The leaves are also almost glabrous, unlike both Ceanothus tomentosus and Ceanothus oliganthus.
The small, white flowers of C. herbaceus in a dense, rounded cluster are about 0.5 to 0.75 inch wide. It has its disk either dull white or greenish. It has calyces with 5 incurved lobes and 5 petals and sepals. The flower is spoon-shaped and clawed, that consists of 5 stamens. The plant bears a fruit that is 3-4.5 mm wide.
Ceanothus integerrimus var. californicus. [9] Leaves elliptic, lanceolate or oblong to ovate in shape and are three ribbed, from the leaf base. Leaf surfaces have small hairs and the undersides are less hairy than the surface. Flowers generally white or blue. Ceanothus integerrimus var. integerrimus. Ceanothus integerrimus var. macrothyrsus. [10]
The Ceanothus griseus shrub may exceed two meters-6 feet in height when mostly erect, or it can grow wider than tall. The evergreen leaves are ribbed and have slightly serrated edges and fuzzy undersides. The inflorescences are borne on thick stalks a few centimeters long and are dense with small blue or purple flowers.
Ceanothus thyrsiflorus can grow more than 6 metres (20 feet) tall and broad in its native chaparral habitat, with glossy green leaves.The clusters of tiny flowers, borne in spring, vary from different shades of blue to close to white. [2]
Ceanothus cuneatus is a spreading bush, rounded to sprawling, reaching up to 3 meters (9.8 ft) in height. The evergreen leaves are stiff and somewhat tough and may be slightly toothed along the edges. The bush flowers abundantly in short, thick-stalked racemes bearing rounded bunches of tiny flowers, each about half a centimeter wide.
Flowers of Ceanothus crassifolius. Ceanothus crassifolius is a species of flowering shrub known by the common name hoaryleaf ceanothus. This Ceanothus is found throughout the coastal mountain ranges of the southern half of California, and its range extends into Baja California. [2]