MANUAL OF THE GRASSES OF THE UNITED STATES 



397 



Figure 560. — Muhlenbergia mexicana. Plant, X 1; glumes and floret, X 10. (Deam 19225, Ind.) 



tipped, about equaling the pointed or 

 awn-tipped lemma, the lemma long- 

 pilose below. % (Described under 

 M. foliosa in Manual, ed. 1. The 

 name M. mexicana had long been mis- 

 applied to the recently recognized M. 

 frondosa (Poir.) Fernald.) — Moist 

 thickets, low woods, and low open 

 ground, Quebec and Maine to British 

 Columbia and Washington, south to 

 North Carolina, New Mexico, and 

 California. 



Muhlenbergia mexicana forma 

 ambigua (Torr.) Fernald. Lemmas 

 with an awn 4 to 10 mm. long. Q[ 

 — Range of the species to North Da- 

 kota; intergrading with forma seti- 

 glumis in Indiana and westward. 



Muhlenbergia mexicana forma 

 setiglumis (S. Wats.) Fernald. % 

 — Glumes with an awn 1 to 2 mm. 

 long; lemma awned as in the preced- 

 ing, the two scarcely distinct. % 

 — Iowa and South Dakota to Wash- 

 ington, south to New Mexico and 

 California. 



42. Muhlenbergia schreberi Gmel. 

 Nimble will. (Fig. 561.) Culms slen- 

 der, branching, spreading and de- 

 cumbent at base, usually rooting at 

 the lower nodes, but not forming defi- 

 nite creeping rhizomes, the flowering 

 branches ascending, 10 to 30 cm. long; 

 blades flat, mostly less than 5 cm. 

 long, and 2 to 4 mm. wide; panicles 

 terminal and axillary, slender, loosely 

 flowered, lax, nodding, 5 to 15 cm. 

 long; glumes minute, the first often 



obsolete, the second rounded, 0.1 to 

 0.2 mm. long; lemma narrow, some- 

 what pubescent around the base, the 

 body about 2 mm. long, the slender 

 awn 2 to 5 mm. long. % — Damp 

 shady places, New Hampshire to Wis- 

 consin and eastern Nebraska, south 

 to Florida and Texas; eastern Mex- 

 ico. In spring and early summer the 

 culms are short and erect with spread- 

 ing blades, the plants being very dif- 

 ferent in appearance from the flower- 

 ing phase of fall. Muhlenbergia 

 schreberi var. palustris (Scribn.) 

 Scribn. Glumes developed as much as 

 1 mm. long. % —Washington, 

 D. C; Bull Run Mountains, Va. 



43. Muhlenbergia curtisetosa 

 (Scribn.) Bush. (Fig. 562.) A little- 

 known form, differing from M. 

 schreberi in having stouter culms, 

 coarser panicles, the glumes evident, 

 rarely as much as 2 mm. long, the 

 lemma 2.5 to 3 mm. long, the awn 1 

 to 2 mm. long. % — Delaware 

 County, Pa., Illinois (Clinton), Mis- 

 souri (Eagle Rock). 



44. Muhlenbergia jonesii (Vasey) 

 Hitchc. (Fig. 563.) Perennial, closely 

 tufted; culms erect, 20 to 40 cm. tall; 

 leaves mostly basal, the numerous 

 lower sheaths finally flattened and 

 loose; ligule 2 to 4 mm. long; blades 

 subfiliform, involute, scabrous; pan- 

 icle narrow, 5 to 15 cm. long, the 

 branches ascending, rather loosely 

 flowered; spikelets 3 to 4 mm. long; 

 glumes broad, scabrous-puberulent, 



