39G 



MISC. PUBLICATION 200, U. S. DEPT. OF AGRICULTURE 



bling M. frondosa, freely branching; 

 culms scaberulous below the nodes as 

 in M. sylvatica; blades numerous, 

 short, narrow, appressed; panicles on 

 the average .shorter and narrower 

 than in M. frondosa; spikelets about 

 as in M. frondosa but the lemma gla- 

 brous. % —Low woods, Maryland 

 to North Carolina; Indiana to Mis- 

 souri, Arkansas, and Texas. 



Figure 558. — Muhlenbergia glabriflora. 

 Glumes and floret, X 10. (Type.) 



40. Muhlenbergia sylvatica (Torr.) 

 Torr. (Fig. 559.) Perennial with creep- 

 ing scaly rhizomes, culms slender, re- 

 trorsely scaberulous below the nodes, 

 rather sparingly branching from the 

 middle and upper nodes, finally lean- 

 ing, the subfiliform branches often 

 elongate, drooping, the plant 40 to 

 100 cm. tall; blades flat, lax, ascend- 

 ing to spreading, 0.5 to 18, commonly 

 8 to 15 cm., long, 2 to 8 mm. wide; 

 panicles slender, nodding, the slender 

 branches appressed, slightly overlap- 

 ping; glumes lanceolate, acuminate or 

 awn-tipped, 2 to 3 mm. long; lemma 

 slightly exceeding the glumes, pilose 

 below, tapering into a slender awn 5 

 to 10 mm. long. 91 (M. umbrosa 

 Scribn.) — Moist woods and thickets, 

 Quebec and Maine to South Dakota, 

 south to Alabama and Texas; Ari- 

 zona. 



Muhlenbergia sylvatica forma 

 attenuata (Scribn.) Palmer and 

 Steyermark. Lemmas short-awned 

 or nearly awnless. % — Ontario, 

 Maine, Connecticut, Indiana, Illinois, 

 Michigan, South Dakota, Missouri, 

 District of Columbia, and Oklahoma. 



Muhlenbergia sylvatica var. 

 robust a Fernald. Culm stiff er, blades 

 somewhat firmer, some of them 7 to 



10 mm. wide; panicles with more 

 densely flowered branches; glumes 

 slightly broader. 21 — Maine, Con- 

 necticut, Xew York, New Jersey, and 

 Indiana. 



41. Muhlenbergia mexicana (L.) 

 Trin. (Fig. 560.) Resembling M. 

 frondosa, the culms erect or ascend- 

 ing, usually simple below, less freely 

 branching, scaberulous below the 

 nodes; blades lax, often 10 to 20 cm. 

 long, mostly 2 to 4 mm. wide; pan- 

 icles mostly long-exserted, narrow, 

 the upper often 10 to 15 cm. long, of 

 numerous short appressed densely 

 flowered somewhat aggregate 

 branches; spikelets 2 to 3 mm. long, 

 glumes narrow, attenuate, awn- 



Figtjre 559. — Muhlenbergia 

 glumes and floret, X 10 



sylvatica. 

 (Conant 



Plant, 

 Mass. 



X 1; 



