Oil Neststraw [Stylocline citroleum Morefield]

Oil Neststraw [Stylocline citroleum Morefield]

Listing CNPS List 1B R-E-D Code 3-3-3

Stat/Fed. Status -- /C2 ASTERACEAE April

Global Rank G1 State Rank S1.1?

Distribution: San Diego County, Kern County

Habitat: This annual is reported from coastal scrub and clay soils in the vicinity of oilfields.

Known Sites: Oil Neststraw is reported from the San Joaquin Valley in Kern County, with only one collection since 1935.

Status: Given the paucity of collected specimens, all populations of this small annual should be protected. The old specimen identified from San Diego County may represent a variant of Stylocline gnaphalalioides which shares similarities with the Kern species. Similar oilfield habitat is largely absent in San Diego County and the substantial disjunction is suspect. Nevertheless, unusual specimens of Stylocline should be closely examined under a microscope for comparison with the recently published description by Morefield in Madrono 39 (2): 123 (1992).

Copyright May 1994 Craig H. Reiser.

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