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Mexican muhly, muhlenbergie du mexique, muhlenbergie mexicaine, wire-stem muhly, wood satin grass

curlyleaf muhly

Habit Plants perennial; rhizomatous, not cespitose. Plants perennial; cespitose, not rhizomatous.
Culms

30-90 cm tall, 0.5-2 mm thick, erect, much branched above the base;

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

30-80 cm, slightly decumbent basally, erect above, not conspicuously branched, branches, when present, not geniculate and widely divergent;

internodes mostly glabrous, sometimes hirtellous below the nodes.

Sheaths

smooth or scabridulous, somewhat keeled;

ligules 0.4-1 mm, membranous, truncate, lacerate-ciliolate;

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

shorter than the internodes, glabrous, margins whitish, rounded towards the base, not becoming spirally coiled when old;

ligules 4-7(10) mm, acuminate, lacerate;

blades 5-20(25) cm long, 0.2-1.2 mm wide, tightly involute, arcuate, scabrous abaxially, scabrous or hirtellous adaxially.

Panicles

terminal and axillary, 2-21 cm long, 0.3-3 cm wide, dense;

primary branches 0.3-5.5 cm, appressed or diverging up to 30° from rachises;

pedicels to 2 mm, strigose;

axillary panicles exserted on long peduncles.

8-20(25) cm long, 2-5 cm wide, loosely contracted;

primary branches 0.5-7 cm, capillary, diverging up to 70° from the rachises, naked basally;

pedicels 3-20 mm.

Spikelets

1.5-3.8 mm, often purple-tinged.

3.5-5 mm, stramineous to brown or purplish.

Glumes

subequal, 1.5-3.7 mm, equaling or slightly shorter than the lemmas, 1-veined, tapering from the bases to the acuminate apices, unawned or awned, awns to 2 mm;

lemmas 1.5-3.8 mm, lanceolate, pubescent on the calluses, lower portion of the mid-veins, and margins, hairs shorter than 0.7 mm, apices scabridulous, acuminate, unawned or awned, awns to 10 mm;

paleas 1.5-3.8 mm, narrowly lanceolate, apices acuminate;

anthers 0.3-0.5 mm, yellow to purplish.

subequal, 1.5-2.5 mm, shorter than the florets, thin, hyaline, glabrous;

lower glumes veinless, truncate or obtuse, often toothed or notched;

upper glumes 1-veined or veinless, obtuse to acute, often mucronate, mucros shorter than 0.7 mm;

lemmas 3.5-5 mm, narrowly lanceolate, calluses hairy, hairs to 0.6 mm, lemma bodies glabrous, smooth, shiny, apices acuminate, awned, awns 10-30 mm, clearly demarcated from the lemma bodies, flexuous;

paleas 3.5-5 mm, narrowly lanceolate, glabrous, acuminate;

anthers 2-2.6 mm, greenish.

Caryopses

1.1-1.6 mm, fusiform, brown.

2.4-3.2 mm, fusiform, brownish.

2n

= 40.

= 40.

Muhlenbergia mexicana

Muhlenbergia setifolia

Distribution
from FNA
AL; AR; AZ; CA; CO; CT; DE; IA; ID; IL; IN; KS; KY; MA; MD; ME; MI; MN; MO; MT; NC; ND; NE; NH; NJ; NM; NV; NY; OH; OK; OR; PA; RI; SD; TN; TX; UT; VA; VT; WA; WI; WV; WY; HI; BC; MB; NB; NS; ON; QC; SK; YT
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ; NM; TX
[BONAP county map]
Discussion

Muhlenbergia mexicana usually grows in mesic to wet areas such as moist prairies and woodlands, stream banks, roadsides, ditch banks, lake margins, swamps, bogs, and hot springs, at elevations 50-3300 m, and is found in many different plant communities. Despite its name, M. mexicana grows only in Canada and the United States.

Plants with awns 3-10 mm long belong to Muhlenbergia mexicana var. filiformis (Torr.) Scribn., and those without an awn or with awns less than 3 mm long to Muhlenbergia mexicana (L.) Trin. var. mexicana. Early in the flowering season, M. mexicana may be confused with plants of M. bushii in which the axillary panicles are poorly developed, but they differ in their dull internodes and the fact that the blades on the secondary branches are usually similar in length and width to those of the main branches.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Muhlenbergia setifolia grows on calcareous rocky slopes, rock outcrops, and in desert grasslands, at elevations of 1000-2250 m. Its range extends from the southwestern United States into northern Mexico. It is similar to M. reverchonii, but differs in its narrower panicles, less widespread panicle branches, truncate to obtuse glumes, and longer lemma awns.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 25, p. 154. FNA vol. 25.
Parent taxa Poaceae > subfam. Chloridoideae > tribe Cynodonteae > Muhlenbergia Poaceae > subfam. Chloridoideae > tribe Cynodonteae > Muhlenbergia
Sibling taxa
M. andina, M. appressa, M. arenacea, M. arenicola, M. arizonica, M. arsenei, M. asperifolia, M. brevis, M. bushii, M. californica, M. capillaris, M. crispiseta, M. curtifolia, M. cuspidata, M. depauperata, M. diversiglumis, M. dubia, M. dumosa, M. elongata, M. eludens, M. emersleyi, M. expansa, M. filiculmis, M. filiformis, M. fragilis, M. frondosa, M. glabrifloris, M. glauca, M. glomerata, M. jonesii, M. lindheimeri, M. longiligula, M. microsperma, M. minutissima, M. montana, M. palmeri, M. pauciflora, M. pectinata, M. peruviana, M. polycaulis, M. porteri, M. pungens, M. racemosa, M. ramulosa, M. repens, M. reverchonii, M. richardsonis, M. rigens, M. rigida, M. schreberi, M. sericea, M. setifolia, M. sinuosa, M. sobolifera, M. spiciformis, M. straminea, M. sylvatica, M. tenuiflora, M. tenuifolia, M. texana, M. thurberi, M. torreyana, M. torreyi, M. uniflora, M. utilis, M. villiflora, M. wrightii, M. ×curtisetosa, M. ×involuta
M. andina, M. appressa, M. arenacea, M. arenicola, M. arizonica, M. arsenei, M. asperifolia, M. brevis, M. bushii, M. californica, M. capillaris, M. crispiseta, M. curtifolia, M. cuspidata, M. depauperata, M. diversiglumis, M. dubia, M. dumosa, M. elongata, M. eludens, M. emersleyi, M. expansa, M. filiculmis, M. filiformis, M. fragilis, M. frondosa, M. glabrifloris, M. glauca, M. glomerata, M. jonesii, M. lindheimeri, M. longiligula, M. mexicana, M. microsperma, M. minutissima, M. montana, M. palmeri, M. pauciflora, M. pectinata, M. peruviana, M. polycaulis, M. porteri, M. pungens, M. racemosa, M. ramulosa, M. repens, M. reverchonii, M. richardsonis, M. rigens, M. rigida, M. schreberi, M. sericea, M. sinuosa, M. sobolifera, M. spiciformis, M. straminea, M. sylvatica, M. tenuiflora, M. tenuifolia, M. texana, M. thurberi, M. torreyana, M. torreyi, M. uniflora, M. utilis, M. villiflora, M. wrightii, M. ×curtisetosa, M. ×involuta
Name authority (L.) Trin. Vasey
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