CPC Plant Profile: Fish Slough Milkvetch
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Plant Profile

Fish Slough Milkvetch (Astragalus lentiginosus var. piscinensis)

Photo Credit: ©2011 Steve Matson
Description
  • Global Rank: T1 - Critically Imperiled
  • Legal Status: Federally Threatened
  • Family: Fabaceae
  • State: CA
  • Nature Serve ID: 140533
  • Date Inducted in National Collection: 09/18/2021

Astragalus lentiginosus var. piscinensis is a threatened variation of the milk-vetch whose geographic distribution is today reduced to a 10-mile stretch along the Fish Slough in Mono County, CA. Named after said slough, the Fish Slough Milk-vetch is restricted to the alkali flats that naturally occur along the slough. For a brief period during the summer months, A. l. var. piscinensis produces clusters of lavender flowers. In their region, they are especially threatened by local herbivores that graze there (cattle, rodents, insects, rabbits, etc.).

Participating Institutions
Updates
  • 09/01/2020
  • Orthodox Seed Banking

Based on an September 2020 extract of the California Plant Rescue Database, California Botanic Garden holds 2 accessions of Astragalus lentiginosus var. piscinensis in orthodox seed collection. There are as many as 2989 seeds of this species in their collection - although some may have been used for curation testing or sent to back up.

  • 01/01/2010

military exercises recreational activities off-road vehicles cattle grazing competition with alien plants urbanization stochastic extinction agriculture predation by rabbits possibly groundwater pumping

  • 01/01/2010

8 populations totaling ca. 700 plants in Fish Slough in Inyo and Mono Counties, CA

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Photos
Nomenclature
Taxon Astragalus lentiginosus var. piscinensis
Authority Barneby
Family Fabaceae
CPC Number 431
ITIS 192582
USDA ASLEP3
Common Names Fish Slough Milk-vetch | Fish Slough milkvetch
Associated Scientific Names Astragalus lentiginosus var. piscinensis
Distribution A. l. var. piscinensis is endemic to Mono County, California
State Rank
State State Rank
California S1
Habitat

This variation of A. lentiginosus prefers wetlands with alkali flats that are seasonally moist. In the springtime, they are supported by the seasonal rainfall and can be found growing alongside species of cord grass. After the rain, an ideal habitat would dry out to form alkali crusts at the surface.

Ecological Relationships

Pollinators
Common Name Name in Text Association Type Source InteractionID

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