.;'.._> 



Figure 551. — Muhlenbergia glomerata. Plant, X 1; 

 glumes and floret, X 8. (Macoun 26241, Ontario.) 



MIS< ■ PUBLICATION 200, U. S. DEPT. OF AGRICULTURE 



open ground, at medium altitudes, 

 Montana to eastern Washington, 

 south to Kansas, New Mexico, and 

 central California. 



32. Muhlenbergia glomerata 

 (Willd.) Trin. (Fig. 551.) Perennial 

 from creeping branching scaly rhi- 

 zomes; culms slender, erect or sub- 

 erect, 30 to 90 cm. tall, simple or 

 with a few erect branches at base, 

 the internodes minutely puberulent; 

 sheaths rounded on the back; ligule 

 minute; blades flat, 5 to 15 cm. long, 

 lax, 2 to 5 mm. wide, ascending; 

 panicle narrow, compact, lobed, most- 

 ly interrupted at base, often pur- 

 plish, 3 to 10 cm. long; spikelets 5 

 to 6 mm. long, the narrow, attenuate 

 subequal glumes stiffly awn-tipped; 

 lemma about 3 mm. long, pointed, 

 pilose on the lower part. 01 — 

 Sphagnum bogs, swamps, and moist 

 ground, Newfoundland to British 

 Columbia, Maine to Wisconsin, Vir- 

 ginia, and Indiana; Nebraska. Has 

 been confused with M. racemosa; 

 occasionally difficult to distinguish. 

 Internodes are sometimes glabrous, 

 but are roughish to the fingernail. 



33. Muhlenbergia racemosa 

 (Michx.) B. S. P. (Fig. 552.) Peren- 

 nial from creeping scaly branching 

 rhizomes, these and culms usually 

 somewhat stouter than in the pre- 

 ceding; culms erect or ascending, 

 subcompressed, 30 to 100 cm. tall, 

 usually finally branching from the 

 middle nodes, the branches mostly 

 erect, the internodes smooth and 

 shining except toward the summit; 

 sheaths loose, keeled; ligule 1 to 1.5 

 mm. long; blades flat, 4 to 18 cm. 

 long, 2 to 7 mm. wide, commonly 

 somewhat firmer than those of M. 

 glomerata, erect to ascending; panicle 

 3 to 14 cm. long, narrow, compact, 

 often lobed, less commonly purple 

 and thicker than in M. glomerata; 

 spikelets 5 (rarely 4.5) to 7 mm. long, 

 the narrow attenuate subequal glumes 

 stiffly awn-tipped; lemma 2.5 to 3.5 

 mm. long, acuminate, rarely with a 

 short awn, pilose on the lower part. 

 % — Meadows, prairies, alluvial soil 



Fioube 552. — Muhlenbergia racemosa. Panicle, X 1; 

 glumea and floret, X 10. (V. H. Chase 940, 111.) 



of floret copious, nearly as long as 

 the body of the lemma. % (M. 

 comata Bentli.) — Meadows, moist 

 thickets, gravelly river beds, and 



