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Montana Field Guide

Montana Field Guides

Cusick's Bluegrass - Poa cusickii
Other Names:  Poa epilis


Global Rank: G5
State Rank: S4

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value:

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General Description
Cespitose (sometimes densely so) perennials, infrequently short rhizomatous or stoloniferous. Culms 10-60(-70) cm tall, terete or weakly compressed, nodes terete and exserted above subtending sheath. (Leaf sheaths, ligules, and blades vary between basal, innovation, and cauline leaves.) Cauline leaves: sheaths closed lower 1/4-3/4; collars smooth or scabrous; ligules 1-3(-6) mm long; blades 0.5-3 mm wide, usually thin and withering, lower surface smooth of scabrous, uppermost ("flag") blade 0.5-6 cm long. Panicles 2-10(-12) cm, usually erect, contracted or loosely contracted; branches 1-3 per node, 0.5-4(-5) cm, smooth or scabrous, spikelets 1-15 per branch. Spikelets (3-)4-10 mm, laterally compressed; florets 2-6. Glumes lanceolate, distinctly keeled; lower glumes 3-veined, distinctly shorter than lowest lemmas; lemmas (3-)4-7 mm, distinctly keeled, smooth to densely scabrous, apices acute; palea keels scabrous, intercostal regions glabrous; anthers vestigal (0.1-0.2 mm) and aborting late in development (adapted from: Soreng, 2007, in Flora N. America, Vol. 24).

Lavin (2012) includes this species in synonymy of Poa fendleriana, in contrast to some other authors (e.g., Soreng, op. cit.; Shaw, 2008, Grasses of Colorado). According to Kartesz (in prep. 2012), we have subspecies cusickii, epilis, and pallida.

Species Range
Present
 


Range Comments
YK to MB and ND south to CA and CO (Kartesz in prep. 2012).

Summary of Observations Submitted for Montana
Number of Observations: 27

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density

Recency

 

(Observations spanning multiple months or years are excluded from time charts)



Habitat
Meadows in sagebrush scrub to rocky alpine slopes (Soreng, 2007, in Flora of N. America, Vol. 24).

References
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Citation for data on this website:
Cusick's Bluegrass — Poa cusickii.  Montana Field Guide.  .  Retrieved on , from