Based on an September 2020 extract of the California Plant Rescue Database, California Botanic Garden holds 1 accessions of Eryngium constancei in orthodox seed collection. There are as many as 346 seeds of this species in their collection - although some may have been used for curation testing or sent to back up.
Endemic to California, Eryngium constancei is known only from three occurrences in two vernal lakes in Lake County and two pools in Sonoma County. Threats are development, ORVs, foot traffic, trash dumping, and logging. This plant is very fragile; its only relatively protected site is threatened by timber harvest, ORVs and proximity to a major road.
Erosion caused by logging
(CDFG 2002; USFWS 1993)
It is known only from three populations in two vernal lakes in Lake County and two pools in Sonoma County. As with any annual species, the number of plants in each population varies from year to year. During good years there may be thousands of plants in each population (CDFG 2002).
A berm has been built to prevent runoff into the pools from increased sedimentation due to logging in the area at the Sonoma County location. The Lake County population was threatened by soil erosion into its pool habitat due to vegetation removal along the edges; it is also at risk from planned reservoir construction.
survey for additional populations
protection from runoff
Additional seed collection for long-term storage is desirable.
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