Ceanothus masonii

Ceanothus masonii is a species of shrub in the buckthorn family, Rhamnaceae, known by the common name Mason's ceanothus. It is endemic to Marin County, California, where it is known only from an area near Bolinas on the Point Reyes National Seashore. It grows in the coastal chaparral on the windblown bluffs..

Mason's ceanothus
Fruits
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Rosales
Family: Rhamnaceae
Genus: Ceanothus
Species:
C. masonii
Binomial name
Ceanothus masonii
McMinn [1]

Description

This rare shrub grows to heights approaching 2 meters. The evergreen leaves are oppositely arranged and less than 2 centimeters long. They are round to oval in shape and have tiny, sharp teeth along the edges, sometimes spine-tipped. The inflorescence is a small cluster of deep blue to purple flowers. The fruit is a capsule just a few millimeters wide, topped with minute horns. This ceanothus is closely related to Ceanothus gloriosus, and may in fact be a variety of that species.[2]

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References
  1. Species was originally described and published in Madroño; Journal of the California Botanical Society. Berkeley. 6: 171. 1942 "Plant Name Details for Ceanothus masonii". IPNI. Retrieved July 17, 2010. Distribution: California (Southwestern U.S.A., Northern America)
  2. California Native Plants Society Rare Plants Inventory


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