Muhlenbergia asperifolia |
Muhlenbergia frondosa |
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alkali muhly, or alkali muhly, scratch grass |
common satin grass, leafy satin grass, muhlenbergie feuillée, wire-stem muhly |
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Habit | Plants perennial; rhizomatous, not cespitose, occasionally: stoloniferous. | Plants perennial; rhizomatous, not cespitose. |
Culms | 10-60(100) cm, decumbent-ascending, bases somewhat compressed-keeled; internodes glabrous, shiny below the nodes. |
50-110 cm tall, 0.7-1.8 mm thick, ascending, geniculate, or decumbent, bushy and much branched above; internodes smooth and shiny for most of their length, glabrous throughout. |
Sheaths | glabrous, margins hyaline; ligules 0.2-1 mm, firm, truncate, ciliate, without lateral lobes; blades 2-7(11) cm long, 1-2.8(4) mm wide, flat, occasionally conduplicate, smooth or scabridulous abaxially, scabridulous adaxially, margins and midveins not conspicuously thickened, greenish, apices acute, not sharp. |
glabrous, margins hyaline; ligules 0.7-1.7 mm, membranous, truncate, lacerate-ciliolate; blades 4-18 cm long, 2-7 mm wide, flat, glabrous, smooth or scabridulous, those of the lateral branches similar to those of the primary culms. |
Panicles | 6-21 cm long, 4-16 cm wide, broadly ovoid, open; primary branches 3-12 cm, capillary, lower branches spreading 30-90° from the rachises, never appearing fascicled; pedicels 3-14 mm, longer than the spikelets. |
2-15 cm long, 0.3-2 cm wide, sometimes dense; axillary panicles common, partly included in the sheaths; primary branches 0.3-4.2 cm, ascending, appressed, occasionally diverging up to 30° from the rachises; pedicels 0.4-5 mm, smooth or scabrous. |
Spikelets | 1.2-2.1 mm, occasionally with 2 or 3 florets. |
2.2-4 mm, imbricate along the branches. |
Glumes | equal, 0.6-1.7 mm, purplish, scabridulous, particularly on the veins, 1-veined, apices acute; lemmas 1.2-2.1 mm, lanceolate to oblong-elliptic, somewhat plumbeous, glabrous, usually smooth, occasionally scabridulous near the apices, apices acute, unawned or mucronate, mucros to 0.3 mm; paleas 1.2-2.1 mm, lanceolate, glabrous, acute; anthers 1-1.3 mm, greenish-yellow to purplish at maturity. |
subequal, 2-4 mm, 3/4 as long as to longer than the lemmas, 1-veined, unawned or awned, awns to 2 mm; upper glumes acuminate to acute; lemmas 2.2-4 mm, narrowly lanceolate, hairy on the calluses, lower 1/3 of the midveins, and margins, hairs 0.3-0.8 mm, apices scabridulous, acuminate, unawned or awned, awns 0.1-13 mm; paleas 2.3-4 mm, narrowly lanceolate, acuminate; anthers 0.3-0.6 mm, usually yellow, occasionally purplish. |
Caryopses | 0.8-1 mm, fusiform, brownish. |
1.6-1.9 mm, fusiform, brown. |
2n | = 20, 22, 28. |
= 40. |
Muhlenbergia asperifolia |
Muhlenbergia frondosa |
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Distribution |
AZ; CA; CO; IA; ID; IL; IN; KS; KY; MD; MI; MN; MO; MT; ND; NE; NM; NV; NY; OH; OK; OR; PA; SD; TX; UT; WA; WI; WY; AB; BC; MB; ON; SK
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AR; CT; DC; DE; GA; IA; IL; IN; KS; KY; LA; MA; MD; ME; MI; MN; MO; MS; NC; ND; NE; NH; NJ; NY; OH; OK; PA; RI; SD; TN; TX; VA; VT; WI; WV; NB; ON; QC
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Discussion | Muhlenbergia asperifolia grows in moist, often alkaline meadows, playa margins, and sandy washes, on grassy slopes, and around seeps and hot springs, at elevations of 55-3000 m. Its geographic range includes northern Mexico. Muhlenbergia asperifolia is morphologically similar to the southeastern M. torreyana, but differs in having glabrous, weakly compressed culms and more widely divergent panicle branches. The caryopses of Muhlenbergia asperifolia are frequently infected by a smut, Tilletia asperifolia Ellis & Everhart, which produces a globose body filled with blackish-brown spores. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Muhlenbergia frondosa grows in forest borders, thickets, clearings, alluvial plains, and disturbed sites within deciduous forests, at elevations of 20-1000 m. It grows only in southern Canada and the contiguous United States. The collection from Oregon was made in an artificial cranberry bog and was probably introduced with the plants. Plants with unawned or shortly (less than 4 mm) awned lemmas can be called M. frondosa forma frondosa, and those with lemma awns 4-13 mm long, M. frondosa forma commutata (Scribn.) Fernald. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 25, p. 179. | FNA vol. 25, p. 158. |
Parent taxa | Poaceae > subfam. Chloridoideae > tribe Cynodonteae > Muhlenbergia | Poaceae > subfam. Chloridoideae > tribe Cynodonteae > Muhlenbergia |
Sibling taxa | ||
Synonyms | M. mexicana subsp. commutata, M. frondosa forma commutata | |
Name authority | (Nees & Meyen ex Trin.) Parodi | (Poir.) Fernald |
Web links |
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