Difference between revisions of "Elymus sierrae"
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| − | |discussion=<p | + | |discussion=<p>Elymus sierrae is best known from rocky slopes and ridgetops in the Sierra Nevada, at 2100-3400 m, and is also found in Washington and Oregon. It resembles E. scribneri (see previous), differing in its non-disarticulating rachises, longer rachis internodes, and longer anthers. Hybrids with E. elymoides (p. 318) have glumes with awns 15+ mm long, and some spikelets with narrower glume bases and shorter anthers. Specimens with wide-margined glumes suggest hybridization with E. violaceus (p. 324).</p> |
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|basionyms= | |basionyms= | ||
|family=Poaceae | |family=Poaceae | ||
| + | |illustrator=Cindy Roché and Annaliese Miller | ||
|reference=None | |reference=None | ||
|publication title= | |publication title= | ||
|publication year= | |publication year= | ||
|special status= | |special status= | ||
| − | |source xml=https:// | + | |source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-data-curation.git/src/314eb390f968962f596ae85f506b4b3db8683b1b/coarse_grained_fna_xml/V24/V24_471.xml |
|subfamily=Poaceae subfam. Pooideae | |subfamily=Poaceae subfam. Pooideae | ||
|tribe=Poaceae tribe Triticeae | |tribe=Poaceae tribe Triticeae | ||
Revision as of 16:07, 30 October 2019
Plants cespitose, not rhizomatous. Culms 20-50 cm, prostrate or decumbent and geniculate; nodes 1-2, exposed, glabrous. Leaves basally concentrated; sheaths glabrous; auricles usually present, to 1 mm on the lower leaves; ligules 0.2-0.5 mm, erose; blades 1-5 mm wide, flat, abaxial surfaces smooth, glabrous, adaxial surfaces prominently ridged over the veins, with scattered hairs, hairs to 0.2 mm, veins closely spaced. Spikes 5-15 cm long, 1.5-2.5 cm wide including the awns, 0.7-1.2 cm wide excluding the awns, flexuous, erect to nodding distally, with 1 spikelet at most nodes, occasionally some of the lower nodes with 2 spikelets; internodes 5-15 mm long, 0.2-0.5 mm wide, both surfaces glabrous, edges ciliate, not scabrous. Spikelets 15-20 mm, ascending to divergent, with 3-7 florets; rachillas glabrous; disarticulation above the glumes, beneath each floret. Glumes subequal, 6-9 mm long, 0.7-1 mm wide, lanceolate, glabrous, the bases evidently veined, apices entire, tapering into a 3-10 mm awn; lemmas 12-16 mm, glabrous, sometimes scabridulous, apices bidentate, awned, awns 15-30 mm, arcuately diverging to strongly recurved; paleas subequal to the lemmas, apices about 0.4 mm wide; anthers 2-3.5 mm. 2n = 28.
Discussion
Elymus sierrae is best known from rocky slopes and ridgetops in the Sierra Nevada, at 2100-3400 m, and is also found in Washington and Oregon. It resembles E. scribneri (see previous), differing in its non-disarticulating rachises, longer rachis internodes, and longer anthers. Hybrids with E. elymoides (p. 318) have glumes with awns 15+ mm long, and some spikelets with narrower glume bases and shorter anthers. Specimens with wide-margined glumes suggest hybridization with E. violaceus (p. 324).
Selected References
None.