Calamagrostis tweedyi - (Scribn.) Scribn. ex Vasey
Cascade Reedgrass
Taxonomic Status: Accepted
Related ITIS Name(s): Calamagrostis tweedyi (Scribn.) Scribn. (TSN 40567)
Unique Identifier: ELEMENT_GLOBAL.2.158107
Element Code: PMPOA17150
Informal Taxonomy: Plants, Vascular - Flowering Plants - Grass Family
 
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Monocotyledoneae Cyperales Poaceae Calamagrostis
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Concept Reference
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Concept Reference: Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.
Concept Reference Code: B94KAR01HQUS
Name Used in Concept Reference: Calamagrostis tweedyi
Conservation Status
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NatureServe Status

Global Status: G3
Global Status Last Reviewed: 25Apr2000
Global Status Last Changed: 25Apr2000
Rounded Global Status: G3 - Vulnerable
Reasons: Restricted, bipartite range; no protected populations. In Montana two of 18 extant popoulations are large and the species occurs in a broad ecological amplitude in many montane settings, as reflected in elevation range and habitat types.
Nation: United States
National Status: N3

U.S. & Canada State/Province Status
United States Idaho (S2), Montana (S3), Oregon (SNR), Washington (S3)

Other Statuses

NatureServe Global Conservation Status Factors

Range Extent Comments: Mineral county, Montana; Idaho county, Idaho; Chelan and Kittitas counties, Washington (Dorn, 1984, lists for Sanders counties, Montana also).

Number of Occurrences: 6 - 20
Number of Occurrences Comments: 18 known occurrences in Montana, 2 in Idaho, lack information from Washington. According to Michael Mancuso (pers. comm., Apr. 2000), the bulk of this species range is in Washington.

Population Size Comments: Often large, but perhaps clonal, populations. In Montana, one of the 18 populations is a vigorous one in an old clearcut and another population has about 100,000 individuals.

Overall Threat Impact Comments: Fire suppression may be detrimental to the species.

Intrinsic Vulnerability Comments: Unknown.

Other NatureServe Conservation Status Information

Distribution
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Global Range: Mineral county, Montana; Idaho county, Idaho; Chelan and Kittitas counties, Washington (Dorn, 1984, lists for Sanders counties, Montana also).

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

U.S. & Canada State/Province Distribution
United States ID, MT, OR, WA

Range Map
No map available.


U.S. Distribution by County Help
State County Name (FIPS Code)
ID Idaho (16049)
MT Mineral (30061), Missoula (30063), Ravalli (30081), Sanders (30089)
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
17 Middle Clark Fork (17010204)+, Bitterroot (17010205)+, Lower Flathead (17010212)+, Lower Clark Fork (17010213)+, Middle Salmon-Chamberlain (17060207)+, South Fork Salmon (17060208)+, Lower Salmon (17060209)+
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
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General Description: Cascade Reedgrass is a glabrous perennial arising from a short rhizome with flowering stems which stand 4-15 dm tall. The blades of the stem leaves are flat, 5-13 mm wide, and up to about 12 cm long; leaves from short vegetative shoots have somewhat narrower and longer blades (up to 30 cm). The leaves have open sheaths and membranous ligules, which are 6-15 mm long, but no auricles. Numerous spikelets are borne in a compact panicle which is 8-16 cm long and about 2 cm wide. The spikelets consist of 2 glumes which enclose a single floret. The glumes are approximately equal in size, 4.5-9 mm long, and slightly longer than the lemma. A sharply bent awn arises from around the middle of the lemma back and exceeds the glumes by about 5 mm. The callus is slightly bearded with hairs less than 1 mm long.
Diagnostic Characteristics: Distinguished from other CALAMAGROSTIS in Montana by the combination of having flat leaves, a long bent awn, and an only slightly bearded callus. Vegetative plants of the species may be identified by the leaf and habit characters given above, but closely resemble CINNA LATIFOLIA, which grows along with the species in Montana.
Habitat Comments: Montane grasslands, open slopes, open coniferous forests; sometimes in burned areas, clearcuts or on ridges at mid-ele
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: 10Jul1987
NatureServe Conservation Status Factors Author: Shelly, J.S., and P. Lesica. M. Martinez (May/98).
Element Ecology & Life History Edition Date: 08Oct1994
Element Ecology & Life History Author(s): JM

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
  • Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.

  • Kratz, A. M. 1989. CALAMAGROSTIS TWEEDYI - summary of 1989 fieldwork for the USFS Region 1.

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