Flat-seeded Spurge [Chamaesyce platysperma (S. Watson.) Shinners]

Flat-seeded Spurge [Chamaesyce platysperma (S. Watson.) Shinners]

Listing CNPS List 3 R-E-D Code 3-2-2

State/Federal. Status -- /C2 EUPHORBIACEAE Feb.-Sep.

Global Rank G3 State Rank S1.2?

Distribution: Imperial County, Riverside County; Arizona; reported San Diego County

Habitat: This small prostrate annual is found associated with desert dune systems.

Known Sites: Flat-seeded Spurge is reported from near Thousand Palms in the Coachella Valley (not seen since 1914) and from the vicinity of Yuma, Arizona. A report from Imperial County is in the Superstition Mountains.

Status: This present status of this rare species of the deserts of Southern California is poorly known; it is presumed stable. However, little collection information is available, and the dune systems in the Coachella Valley have been heavily impacted in recent years. The status of this inconspicuous annual in San Diego County is unknown. A report of this species there cannot be confirmed; potential habitat is found in the dune system near Clark Dry Lake and several other similar, but smaller dune systems in the Anza-Borrego Desert. This annual has a glabrous ovary and capsules with radially elongate glands that are unappendaged. It may be under-reported due to superficial similarities with several other common spurges found on the southern deserts. Given the dearth of extant sites known from the region, all native populations should be protected.

Copyright May 1994 Craig H. Reiser.

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