146. Gramineak 341 



1 1 . Spikelets 2-2.5 mm long; srlumes subulate-lanceolate, 

 somewhat shorter than or nearly equallint;' the 

 lemma; anthers 0.3-0.6 mm long; moist woods. Auu^.- 



Oct M. sylvatica Torr. 



4. Plants without scaly rhizomes; glumes lanceolate, shorter than 

 the awnless lemma; anthers 1-1.5 mm long; di"y ground, n. 



Til. July-Sept. [S poroholus hrevijoliiis (Nutt.) Scribn.] 



M. cuspidata (Torr.) Rydb. 



1. Panicles open, the .slender branches widely spreading. 



12. Spikelets 3-4 nun long, the awns 5-15 mm long; stems 60-100 

 cm tall, tufted; rhizomes none; sandy soil, s. 111. Sept. -Oct. 



- M. capillaris (Lam.) Trin. 



12. Spikelets 1.5-2 mm long, awnless; stems 10-40 cm tall; plants 

 with creeping scaly rhizomes; sandy soil, n. 111. June-Sept. 



[Sporobolus asperijolius Nees & Mey.] 



M. asperifolia (Nees & Mey.) Parodi 



43. Sporobolus R.Br. — Dropseed 

 1. Plants perennial; leaf-blades much longer than the sheaths. 



2. Spikelets 1.5-2.5 mm long; panicle either free and spreading at 

 maturity or remaining partly or wholly included in the 

 sheath; leaf-sheaths with a conspicuous tuft of whitish hairs 



at summit; sandy soil. Aug. -Sept. Sand Dropseed 



- -..i5'. cryptandrus (Torr.) A.Gray 



2. Spikelets 4-8 mm long. 



3. Second glume shorter than the lemma; panicle contracted, 

 more or less included in the sheath. 

 4. Lemma glabrous, glossy; spikelets 5-6 mm long; dry sandy 



soil. Sept. -Oct S. asper (Michx.) Kunth 



4. Lemma pubescent at base; spikelets 6-8 mm long; sandy 



soil, local. Aug.-Sept. {S. canovirens Nash] 



- - - S. clandcstinus (Bieler) Hitchc. 



3. Second glume slightly longer than the glabrous lemma; spike- 

 lets 4-6 mm long; panicle long-exserted at maturity; dry 



soil. Aug.-Sept. Prairie Dropseed S. hcterolepi.s A.Gray 



1. Plants annual; sheaths enclosing the lateral panicles; leaf-blades 

 short, scarcely longer than the sheaths. 

 5. Lemma pubescent; spikelets 3.5-6 mm long; diy sandy soil. 



Sept. -Oct S. vaginifiorus (Torr.) Wood 



5. Lemma glabrous; spikelets 2-3 mm long; dry sandy soil. Sept.- 

 Oct S. neglectus Nash 



44. Heleochloa Host 



H. schoenoides (L.) Host. Waste places, occasional; introd. from 

 Eur.; Cook Co., Moffatt in 1893: St. Clair Co.. /. Ncill in 1947. 



45. Brachyelytrum Beau v. 



B. ircctum (Schreb.) Beauv. Woods, locally throughout 111. 

 June-Aug. 



