Saussurea weberi - Hulten
Weber's Saw-wort
Taxonomic Status: Accepted
Related ITIS Name(s): Saussurea weberi Hultén (TSN 36083)
Unique Identifier: ELEMENT_GLOBAL.2.154379
Element Code: PDAST8B060
Informal Taxonomy: Plants, Vascular - Flowering Plants - Aster Family
 
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Dicotyledoneae Asterales Asteraceae Saussurea
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Concept Reference
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Concept Reference: 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.
Concept Reference Code: B99KAR01HQUS
Name Used in Concept Reference: Saussurea weberi
Taxonomic Comments: Previously treated as synonym of Saussurea densa, Saussurea weberi is now recognized as distinct by Kartesz' Synthesis (Kartesz 1999) and FNA (2006).
Conservation Status
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NatureServe Status

Global Status: G2G3
Global Status Last Reviewed: 07Jul2016
Global Status Last Changed: 26Oct1999
Ranking Methodology Used: Ranked by calculator
Rounded Global Status: G2 - Imperiled
Reasons: Occurs in Colorado, Wyoming, and Montana, where it is confined to small areas of suitable alpine habitat (Kartesz 1999, Fertig 2000). Between 18 and 32 occurrences. Threats include hikers, mining, and grazing by wild animals.
Nation: United States
National Status: N2N3

U.S. & Canada State/Province Status
United States Colorado (S2), Montana (S2), Wyoming (S2)

Other Statuses

NatureServe Global Conservation Status Factors

Range Extent Comments: Occurs in western Montana, northwest Wyoming, and central Colorado.

Area of Occupancy: 26-125 4-km2 grid cells
Area of Occupancy Comments:  

Number of Occurrences: 6 - 80

Population Size Comments: In Wyoming, populations often have thousands to tens of thousands of individuals, but are restricted to small areas of suitable habitat in the alpine (Fertig 2000). Most populations in Colorado are small but at least one has thousands of plants.

Number of Occurrences with Good Viability/Integrity: Few (4-12)

Overall Threat Impact: Medium
Overall Threat Impact Comments: May be threatened by mining, hikers, and alpine grazing.

Short-term Trend: Decline of <30% to relatively stable
Short-term Trend Comments: There are five historic occurrences but many occurrences are thought to be stable (Fertig 2000).

Other NatureServe Conservation Status Information

Distribution
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Global Range: Occurs in western Montana, northwest Wyoming, and central Colorado.

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

U.S. & Canada State/Province Distribution
United States CO, MT, WY

Range Map
No map available.


U.S. Distribution by County Help
State County Name (FIPS Code)
CO Custer (08027), Lake (08065), Park (08093), Summit (08117)
MT Deer Lodge (30023), Granite (30039)
WY Fremont (56013), Sublette (56035), Teton (56039)
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
10 Big Hole (10020004)+, Upper Wind (10080001)+, South Platte Headwaters (10190001)+, Upper South Platte (10190002)+
11 Arkansas Headwaters (11020001)+
14 Blue (14010002)+, Upper Green (14040101)+
17 Flint-Rock (17010202)+, Gros Ventre (17040102)+
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
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General Description: Weber's Saw-wort is a dwarf perennial herb that is 5-20 cm high and arising from a woody rootstock. The lance-shaped leaf blades are coarsely toothed, up to 8 cm long, and have a broad petiole. The alternate leaves are crowded on the stem, reduced, and lacking petioles towards the top. Herbage is covered with long, tangled hairs when young but becomes glabrous with age. The purple flowering heads are borne in a dense cluster subtended by leaves at the top of the stem. The broad involucral bracts of the heads have rounded tips and are 11-15 mm long. All of the flowers are tubular (disk flowers); ray flowers are absent. The achene has a pappus on top.
Diagnostic Characteristics: The clustered, purple, rayless flowering heads, together with the high elevation habitat, are distinctive. The similar S. DENSA, occurring in the northwest mountains, has narrow, pointed involucral bracts.
Palustrine Habitat(s): HERBACEOUS WETLAND
Terrestrial Habitat(s): Alpine, Bare rock/talus/scree, Forest/Woodland, Grassland/herbaceous, Woodland - Conifer
Habitat Comments: Generally occurs on rocky, exposed limestone slopes, talus, and ridges, in high elevation, subalpine to alpine sites. Habitats include gravelly tundra slopes amid scree (often on solifluction lobes on exposed sites, with poorly developed, limestone- and dolomite-derived soils), alpine talus slopes on limestone-derived substrates, and moderately dry alpine meadows and adjacent slopes on northwest aspects, in well-developed, calcareous soils. Also occasionally found on sandstone or granite substrates. Communities include stable tundra associations on solifluction lobes (where co-occurring species include grasses, sedges, and small willows), alpine wetlands (where co-occurring species include Salix brachycarpa, Salix glauca, Betula glandulosa, and mosses), moderately dry to moist alpine meadows, alpine cushion plant communities, and, occasionally, Engelmann spruce woodland to stunted krummholz. However, many sites (e.g. disturbed fell fields) are sparsely vegetated. 2850 - 4350 m.

Economic Attributes Not yet assessed
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Management Summary Not yet assessed
Help
Population/Occurrence Delineation Not yet assessed
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Population/Occurrence Viability
Help
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: 07Jul2016
NatureServe Conservation Status Factors Author: Olivero, A.(2002), rev. Treher (2016)
Element Ecology & Life History Edition Date: 21Nov1994
Element Ecology & Life History Author(s): KAJ

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
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