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wirestem muhly

Photo is of parent taxon

wirestem muhly

Habit Plants perennial, 30–90 cm tall; rhizomatous.
Culms

0.5–2 mm thick; much branched above the base, not nodulose;

internodes dull, puberulent or glabrous for most of their length, sometimes strigose immediately below the nodes.

Leaves

blades 2–20 cm × 2–6 mm; flat, scabrous or smooth, those of the secondary branches similar in length and width to those of the main branches.

Inflorescences

terminal and axillary, 2–21 × 0.3–3 cm; dense, appressed or diverging up to 30° from the inflorescence axis;

primary branches 0.3–5.5 cm × over 0.1 mm.

Spikelets

1.5–3.8 mm, often purple-tinged.

Glumes

subequal, 1.5–3.7 mm, approximately as long as or slightly shorter than the lemmas, 1-veined, tapering from the bases to the acuminate tips; awnless or awned; awns; if present; to 2 mm.

Lemmas

1.5–3.8 mm, lanceolate, pubescent on calluses and lower portion of the midveins and margins;

hairs shorter than the florets; less than 1.5 mm long;

tips minutely scabrous, acuminate; awnless or awned;

lemma awns 0–10 mm.

awnless or nearly so;

lemma awns (if present) less than 3 mm.

Anthers

0.3–0.5 mm; yellowish to purplish.

2n

=40.

Muhlenbergia mexicana

Muhlenbergia mexicana var. mexicana

Distribution
[WildflowerSearch map]
[BONAP county map]
Discussion

Throughout North America. 2 varieties.

Muhlenbergia mexicana flowers relatively late in summer after river levels drop. It is seldom collected. The similar M. andina has lemma hairs about as long as the lemma body.

Cranberry bogs, stream banks, moist meadows. 300–700 m. Col, Est. CA, ID, NV, WA; throughout most of North America. Exotic.

Muhlenbergia mexicana var. mexicana has been collected in the Columbia Gorge and in a cranberry bog in Coos County. The Coos County specimen may have been introduced with cranberry stock from Wisconsin.

Source Flora of Oregon, volume 1, page 435
Barbara Wilson, Richard Brainerd, Nick Otting
Flora of Oregon, volume 1, page 436
Barbara Wilson, Richard Brainerd, Nick Otting
Sibling taxa
M. andina, M. asperifolia, M. filiformis, M. mexicana, M. minutissima, M. richardsonis, M. uniflora
M. mexicana var. filiformis
Subordinate taxa
M. mexicana var. filiformis, M. mexicana var. mexicana
Synonyms Muhlenbergia glomerata, Muhlenbergia racemosa
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