Coulter Ringstem [Boerhavia coulteri (Hook.) S. Watson]

Coulter Ringstem [Boerhavia coulteri (Hook.) S. Watson]

Listing CNPS Unlisted R-E-D Code None

State/Federal. Status -- None NYCTAGINACEAE Aug.-Nov.

Global Rank None State Rank None

Distribution: San Diego County; Arizona; Mexico

Habitat: In San Diego County this annual occurs on a sandy floodplain and within adjacent Juniper Woodland on the periphery of the Anza-Borrego Desert. Elsewhere to the east into Arizona it may be a weedy, desert species of disturbed roadsides and agricultural lands.

Known Sites: The Coulter Ringstem is found at the edges of the broad, sandy wash east of Banner. It is also reported from the nearby San Felipe Valley.

Status: Although apparently locally common outside of California in the American southwest, this species is quite uncommon in Southern California. At Banner it grows with both Boerhavia wrightii and Boerhavia coccinea in what may be a natural, rather than introduced circumstance. The population here of Coulter Ringstem relies on sporadic summer thunderstorms to sprout, and can generally only be observed in the mid to late summer months.


Copyright May 1994 Craig H. Reiser.

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