Regularity: Regularly occurring
Global Range: Ceanothus arboreus occurs on Santa Cruz Island and Santa Catalina, of the Channel Islands of California (Junak et al. 1995).
Molecular Biology and Genetics
Barcode data: Ceanothus arboreus
Statistics of barcoding coverage: Ceanothus arboreus
Public Records: 1
Specimens with Barcodes: 1
Species With Barcodes: 1
National NatureServe Conservation Status
Rounded National Status Rank: N3 - Vulnerable
NatureServe Conservation Status
Rounded Global Status Rank: G3 - Vulnerable
Reasons: Ceanothus arboreus is endemic to Santa Cruz island and Santa Catalina (Channel Islands), California. It occurs on rocky slopes, exposed ridgetops, floodplains; chaparrel, pine forest. While it is endemic to the Channel Islands, it is common elsewhere it occurs (Junak et al. 1995).
Ceanothus arboreus is a species of shrub endemic to California, especially to the Channel Islands. It is known commonly as feltleaf ceanothus. It is a species of what are sometimes called California lilacs, and may be referred to as the California mountain lilac or island mountain lilac.
Ceanothus arboreus is a spreading bush growing up to 6 metres (20 ft) in height, bearing glossy dark green leaves which are leathery or felt-like on their undersides. It is sometimes planted as a fast-growing ornamental for its showy bright blue flowers, which grow in plentiful panicles, or bunches, of tiny five-lobed blossoms. Some varieties and cultivars have light, powder blue blooms, and others bear darker blue flowers. The fruits are three-lobed, triangular capsules.
- C. arboreus was first described and published in Bulletin of the California Academy of Sciences, 2(6): 144. 1886. "Plant Name Details for Ceanothus arboreus". IPNI. Retrieved August 22, 2010.
- "RHS Plant Selector - Ceanothus arboreus 'Trewithen Blue'". Retrieved 26 June 2013.
Names and Taxonomy
Comments: Kartesz (1999) does not recognize the existence of varieties, however, USFWS has designated Ceanothus arboreus var. glaber as a candidate for listing (9/93).
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