CPC Plant Profile: Missouri Milkvetch
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Plant Profile

Missouri Milkvetch (Astragalus missouriensis var. humistratus)

  • Global Rank: T1 - Critically Imperiled
  • Legal Status: N/A
  • Family: Fabaceae
  • State: CO, NM
  • Nature Serve ID: 140700
  • Date Inducted in National Collection:

Astragalus missouriensis var. humistrata is a perennial purple-flowered legume with pinnate basal leaves. Mature pods are necessary to distinguish this variety from related species A. amphioxys and A. chameleuce, as well as other varieties of A. missouriensis. Plants flower in May and set fruit in June.

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  • 08/27/2020
  • Orthodox Seed Banking

Seed collection and storage

  • 08/27/2020
  • Seed Collection

Seed collection and storage

Nature Serve Biotics
  • 05/02/2017

There are 12 known occurrences from three counties, one county in New Mexico and two counties in Colorado. However, many of the occurrences are historical. Population size is small. Threatened by development.

Isely, Mary VB Goshorn
  • 01/01/2010

The primary threat in Colorado is considered to be roads and housing and urban development in the vicinity of Pagosa Springs. Most of the Colorado occurrences are along roadsides as the plant tends to grow in disturbed soil. Little is known about the effe

Isely, Mary VB Goshorn
  • 01/01/2010

A total of 12 occurrences have been documented, 10 in Colorado and 2 in New Mexico. However many of the occurrences are historical and with sparse information.

Isely, Mary VB Goshorn
  • 01/01/2010


Isely, Mary VB Goshorn
  • 01/01/2010

On the USFS Sensitive Species list

Isely, Mary VB Goshorn
  • 01/01/2010

The primary information need for Astragalus missouriensis var. humistratus is the determination of total population numbers and trends over time for known populations. It would also be useful to survey for additional populations, especially on public lands. Basic life-history information, including pollination dynamics and possible impacts on pollinators, rates of recruitment and survival, dispersal, and metapopulation dynamics would contribute to conservation and restoration efforts. Finally, quantification of the effects of land management practices on the survival and persistence of the species would greatly facilitate management decisions for this species (Decker 2006).

Isely, Mary VB Goshorn
  • 01/01/2010

Seed collection and storage


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Taxon Astragalus missouriensis var. humistratus
Authority Isely
Family Fabaceae
CPC Number 6073
ITIS 192632
Common Names Missouri Milkvetch | Archuleta milkvetch
Associated Scientific Names Astragalus missouriensis var. humistratus
Distribution Known only from New Mexico (Rio Arriba) and Colorado (Archuleta and Hinsdale counties).
State Rank
State State Rank
Colorado S1
New Mexico S1

Occurs in open dry meadows or sparsely vegetated soils within ponderosa pine woodland, Gambel oak-mixed montane shrubland, and upper pinon-juniper woodland (Decker 2006; Heil 2007). Substrate is clay soils derived from Mancos, Lewis, and Mesa Verde shales (Decker 2006).

Ecological Relationships

The dynamics of the broad habitat types where Astragalus missouriensis var. humistratus is found are reasonably well documented. However, the specific position of A. missouriensis var. humistratus within these ecological systems is not well understood. Furthermore, although the species has been casually observed in the field by a variety of workers, there are no multi-year observations that would contribute to an understanding of the species life cycle and population trends (Decker 2006).

Common Name Name in Text Association Type Source InteractionID
Lead Institution State Reintroduction Type Year of First Outplanting

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