CPC Plant Profile: Mancos Saltbush
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Plant Profile

Mancos Saltbush (Proatriplex pleiantha)

Description
  • Global Rank: G3 - Vulnerable
  • Legal Status: N/A
  • Family: Amaranthaceae
  • State: CO, NM, NN, UT
  • Nature Serve ID: 135662
  • Date Inducted in National Collection: 03/08/1989

Mancos shadscale, an annual herb that is a member of Goosefoot Family was collected in southwestern Colorado and first described in 1950 by W. A. Weber. Now known from locations in northwestern New Mexico, southeastern Utah, and southwestern Colorado, it is most common on badland landscapes. The fleshy leaves are alternate to subopposite, attached to the stems. The fruiting bracts are triangular ovate and contain 2-6 flowers. The plant blooms from late May to June, producing yellowish flowers that turn red at maturity. It is the only Atriplex species that has male and female flowers on the same plants. Its shining, smooth, and black seed falls at maturity (Spackman 1997, Stutz et al. 1990, and Welsh 2003).

Participating Institutions
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Updates
Nature Serve Biotics
  • 05/02/2017

Range is quite restricted, only two EOs known. EGR (1984) supports GRANK of G1, but reranked 1994 as 'G3' based on newer information.

Akiko Okawado
  • 01/01/2010

Threats include coal mining and gas well operations (NMRPTC 1999).

Akiko Okawado
  • 01/01/2010

Not Available

Akiko Okawado
  • 01/01/2010

None known.

Akiko Okawado
  • 01/01/2010

Not Available

Akiko Okawado
  • 01/01/2010

Research is needed to understand all aspects of the ecology and biology of this species.

Akiko Okawado
  • 01/01/2010

Not Available

MORE

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Photos
Nomenclature
Taxon Proatriplex pleiantha
Authority (W.A. Weber) Stutz & G.L. Chu
Family Amaranthaceae
CPC Number 521
ITIS 20558
USDA PRPL2
Common Names Mancos Saltbrush | saltplant | Mancos shadscale
Associated Scientific Names Atriplex pleiantha | Proatriplex pleiantha
Distribution Mancos shadscale has been found in Montezuma County, Colorado; San Juan County, New Mexico; and San Juan County, Utah (Stutz et al. 1990).
State Rank
State State Rank
Colorado S1
New Mexico S3?
Navajo Nation S3
Utah S1
Habitat

This species is found on barren, saltbush badlands; on highly dissected and eroded gray shale and clay of the Mancos Formation (Spackman 1997). Elev. 1,400-1,500 m. (Welsh 2003).Associated plants include Kochia Americana, Suaeda torreyana, Atriplex obovata, Monolepis nuttalliana, and Distichlis spicata in some areas. However, this species occurs most commonly on badland landscapes which are often completely devoid of other vegetation (Stutz et al. 1990).

Ecological Relationships

None known.

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

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