Phenology of Threecorner Milkvetch, Astragalus geyeri var. triquetrus, at Sandy Cove, Lake Mead NRA
Powell E. 1998. Phenology of Threecorner Milkvetch, Astragalus geyeri var. triquetrus, at Sandy Cove, Lake Mead NRA. Lake Mead NRA. Boulder City, NV
Astragalus geyeri var. triquetrus, threecorner milkvetch, is a rare annual plant endemic to southern Nevada and northwest Arizona. The species is listed as critically endangered by the State of Nevada and is only found in sandy habitats along the Virgin and Muddy River basins to slightly west of the confluence of the Virgin and Colorado Rivers at Sandy Cove just east of Callville Bay on Lake Mead. Niles recorded 18 occurrences of the species in Clark County, Nevada and 1 occurrence in Mohave County, Arizona (Niles et al., 1995). The largest population recorded by Niles was of 1,500 plants located on sand dunes at Sandy Cove and Hamblin Bay in Lake Mead National Recreation Area. The milkvetch was studied at Sandy Cove in the spring of 1998 (Figure 1). On March 24, 1998, the sand dunes of Sandy Cove were searched for threecorner milkvetch plants. Approximately 50 plants were found in several small sand blowout areas or depressions in large active dunes about 200 meters above the shoreline.
- Type
- Book
- Authors
- Powell, Elizabeth
- Date of Issue
- 1998-08
- Publisher
- Lake Mead NRA
- Units
- LAKE
- Keywords
- Absence (Biodiversity), Arctomecon californica (California Bearpoppy), Distribution (Biodiversity), Papaveraceae (Poppies), Papaverales, Plant Studies, Presence (Biodiversity), Taxa Links To References, Vascular Plant