Atriplex argentea var. longitrichoma - (Stutz, G.L. Chu & S.C. Sand.) Welsh
Pahrump Orach
Synonym(s): Atriplex longitrichoma Stutz, Chu, & Sanderson
Taxonomic Status: Provisionally accepted
Unique Identifier: ELEMENT_GLOBAL.2.638276
Element Code: PDCHE04056
Informal Taxonomy: Plants, Vascular - Flowering Plants - Goosefoot Family
 
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Dicotyledoneae Caryophyllales Chenopodiaceae Atriplex
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Concept Reference
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Concept Reference: Welsh, S. L. 2000. Nomenclatural proposals in Atriplex (Chenopodiaceae). Rhodora 102: 415-427.
Concept Reference Code: A00WEL01HQUS
Name Used in Concept Reference: Atriplex argentea var. longitrichoma
Taxonomic Comments: The newly (2001) described Atriplex argentea var. longtrichoma may have been included in Kartesz's (1994) A. argentea var. hillmanii.
Conservation Status
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NatureServe Status

Global Status: G5T2
Global Status Last Reviewed: 07Aug2012
Global Status Last Changed: 20Aug2013
Ranking Methodology Used: Ranked by calculator
Rounded Global Status: T2 - Imperiled
Reasons: An annual species which does well in moderately disturbed areas in a common habitat, but with a very limited occurrences and geographic range actively being reduced by urban and residential expansion.
Nation: United States
National Status: N2

U.S. & Canada State/Province Status
United States California (S2), Nevada (S1)

Other Statuses

NatureServe Global Conservation Status Factors

Range Extent Comments: Known only from Pahrump and Stewart valleys in southern Nye County, Nevada, and adjacent southeastern Inyo County, California.

Number of Occurrences: 1 - 20
Number of Occurrences Comments: "Abundant in and around Pahrump, NV, occurring in open desert communities, alongside roadways, and in agricultural fields" (Stutz et al 1999). The cited specimens currently resolve to only one EO each in Nevada and California, but may be more common than currently documented.

Overall Threat Impact Comments: Urban and residential expansion in the Pahrump Valley area constitute the biggest threat to the taxon, and may already have extirpated undocumented populations.

Short-term Trend: Decline of 10-30%
Short-term Trend Comments: Habitat loss in the Pahrump urban area may be somewhat offset by increased abundance in adjacent disturbed habitat.

Intrinsic Vulnerability Comments: Appears to increase with moderate disturbance within its limited geographic range and soil type.

Other NatureServe Conservation Status Information

Distribution
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Global Range: Known only from Pahrump and Stewart valleys in southern Nye County, Nevada, and adjacent southeastern Inyo County, California.

U.S. States and Canadian Provinces
Color legend for Distribution Map

U.S. & Canada State/Province Distribution
United States CA, NV

Range Map
No map available.


U.S. Distribution by County Help
State County Name (FIPS Code)
CA Inyo (06027)
NV Nye (32023)
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
16 Ivanpah-Pahrump Valleys (16060015)+
18 Upper Amargosa (18090202)+
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History Not yet assessed
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Basic Description: Annual to 20 cm tall, covered with long deciduous club-shaped hairs, lower branches spreading, to 30 cm long, round in cross section, leaves sessile and alternate above, shortly stalked and opposite below, 25-35 x 10-13 mm, always entire, fruiting bracts 5-6 mm long and wide with large curved marginal teeth and flat to conical appendages; tetraploid (2n=36).
Economic Attributes Not yet assessed
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Management Summary Not yet assessed
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Population/Occurrence Delineation Not yet assessed
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Population/Occurrence Viability
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U.S. Invasive Species Impact Rank (I-Rank) Not yet assessed
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Authors/Contributors
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NatureServe Conservation Status Factors Edition Date: 22May2002
NatureServe Conservation Status Factors Author: J. Morefield (NVHP)

Botanical data developed by NatureServe and its network of natural heritage programs (see Local Programs), The North Carolina Botanical Garden, and other contributors and cooperators (see Sources).

References
Help
  • Flora of North America Editorial Committee. 2003b. Flora of North America North of Mexico. Vol. 4, Magnoliophyta: Caryophyllidae, part 1. Oxford University Press, New York. 559 pp.

  • Kartesz, J.T. 1999. A synonymized checklist and atlas with biological attributes for the vascular flora of the United States, Canada, and Greenland. First edition. In: Kartesz, J.T., and C.A. Meacham. Synthesis of the North American Flora, Version 1.0. North Carolina Botanical Garden, Chapel Hill, N.C.

  • Stutz, H. C., G.-L. Chu, and S. C. Sanderson. 1998 [1999]. Atriplex longitrichoma (Chenopodiaceae), a new species from southwestern Nevada and east-central California. Madrono 45: 128-130.

  • Welsh, S. L. 2000. Nomenclatural proposals in Atriplex (Chenopodiaceae). Rhodora 102: 415-427.

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