Difference between revisions of "Muhlenbergia rigida"

(Kunth) Trin.
Common names: Purple muhly
Synonyms: Muhlenbergia metcalfei
Treatment appears in FNA Volume 25. Treatment on page 190.
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|synonyms={{Treatment/ID/Synonym
 
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|name=Muhlenbergia metcalfei
 
|name=Muhlenbergia metcalfei
|authority=unknown
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|authority=
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|rank=species
 
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|hierarchy=Poaceae;Poaceae subfam. Chloridoideae;Poaceae tribe Cynodonteae;Muhlenbergia;Muhlenbergia rigida
 
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name=Muhlenbergia rigida
 
name=Muhlenbergia rigida
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|authority=(Kunth) Trin.
 
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|basionyms=
 
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|family=Poaceae
 
|family=Poaceae
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|illustrator=Linda A. Vorobik;Annaliese Miller
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|illustration copyright=Utah State University
 
|distribution=Ariz.;N.Mex.;Tex.
 
|distribution=Ariz.;N.Mex.;Tex.
 
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|subfamily=Poaceae subfam. Chloridoideae
 
|subfamily=Poaceae subfam. Chloridoideae
 
|tribe=Poaceae tribe Cynodonteae
 
|tribe=Poaceae tribe Cynodonteae

Latest revision as of 17:58, 11 May 2021

Plants perennial; cespitose, not rhizomatous. Culms 40-100 cm, erect, not conspicuously branched; internodes mostly smooth, sometimes scabridulous below the nodes. Sheaths longer than the internodes, smooth or scabridulous, basal sheaths rounded, not becoming spirally coiled when old; ligules (1)3-12(15) mm, firmer basally than distally, obtuse to acute, often lacerate; blades 12-35 cm long, 1-3 mm wide, flat or involute, smooth or scabridulous abaxially, scabridulous or hirtellous adaxially. Panicles 10-35 cm long, 2-5(12) cm wide, loosely contracted to open, purplish; primary branches 0.4-10 cm, lax, capillary, usually appressed to ascending, occasionally diverging up to 80° from the rachises, naked basally; pedicels 1-10 mm. Spikelets 3.5-5 mm, purplish. Glumes equal, 1-1.7(2) mm, exceeded by the florets, usually glabrous, sometimes mostly hirtellous but glabrous distally, 1-veined, obtuse to subacute, unawned; lemmas 3.5-5 mm, narrowly lanceolate, purplish, calluses hairy, hairs to 0.5 mm, lemma bodies scabridulous to scabrous, apices acuminate, awned, awns 10-22 mm, clearly demarcated from the lemma bodies, flexuous; paleas 3.5-5 mm, narrowly lanceolate, scabridulous, acuminate; anthers 1.7-2.3 mm, purplish. Caryopses 2-3.5 mm, fusiform, brownish. 2n = 40, 44.

Discussion

Muhlenbergia rigida grows on rocky slopes, ravines, and sandy, gravelly slopes derived from granitic and calcareous substrates, at elevations of 1200-2200 m. It is often a common upland bunchgrass, and is also grown as an ornamental plant.

Muhlenbergia rigida grows in two disjunct areas: the southwestern United States south to Chiapas, Mexico, and in Ecuador, Peru, Bolivia, and Argentina. It differs from M. setifolia and M. reverchonii in its purplish, scabridulous to scabrous lemmas.

Selected References

None.

Lower Taxa

None.