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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.
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.
The name was originally used by Theophrastus for another plant, and Linnaeus reused it for Ceanothus. [ 4 ] The Latin specific epithet thyrsiflorus is derived from the Ancient Greek thyrsos ( θύρσος ; meaning a 'contracted panicle, wreath, or thyrsos ') and the Latin florum ( gen. 'flower'), and so, thyrsiflorus means approximately 'with ...
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.
Ceanothus cordulatus is a species of shrub in the family Rhamnaceae known by the common names mountain whitethorn and whitethorn ceanothus. It is native to California and adjacent sections of Oregon, Nevada, and Baja California, where it grows on mountain ridges and other forested areas. This is a spreading shrub growing usually wider than tall ...
Ceanothus perplexans is an evergreen shrub that typically grows 1 to 3 meters tall with spreading, intricately branched stems. Its leaves are a defining characteristic: small, thick, leathery, and oppositely arranged, with distinct cupped leaves that give the plant its common name. In spring, it produces clusters of white or pale blue flowers. [2]