San Joaquin Spearscale
The location database for San Joaquin spearscale (Atriplex joaquiniana) includes 50 data records dated from 1891 to 2003 (California Natural Diversity Database 2005). All of the occurrences are presumed to be extant, but 5 occurrences are historic and have not been surveyed to determine whether the populations are still present. Most of the occurrences are of high precision and may be accurately located, including those in the inventory area.
Very little information is available on the ecology of San Joaquin spearscale. The literature on the species pertains primarily to its taxonomy. The main sources of general information on this species are the Jepson Manual (Hickman 1993) and the California Native Plant Society (2005). Specific observations on habitat and plant associates, threats, and other factors are summarized in the California Natural Diversity Database (2005).
Status
It is included by the California Native Plant Society on list 1B.2 (rare, threatened, or endangered in CA and elsewhere)