Ariz. (Apache, Navajo, Coconino, Yavapai, Greenlee and Cochise cos.), summer; 

 widespread in temp. N. A., introd. from Euras. 



7. Agrostis palustris Huds. Creeping bentgrass. 



Perennial; culms decumbent, often long-stoloniferous, the aerial ones erect, 

 3-5 dm. long, 1-2 mm. thick, leafy; ligule a thin scale 2-4 mm. long; blades 4-10 

 cm. long, 1-3.5 mm. broad, flat; panicles 5-15 cm. long, 1-2 cm. thick, the short 

 branches ascending; glumes 2-3 mm. long; lemma about two thirds as long as the 

 glumes, not awned; palea about two thirds as long as the lemma. 



Fresh-water shores of lakes and ponds, along streams and ditches, in wet 

 meadows and marshes in s.e. Tex., N.M. (Taos Co.) and Ariz. (Coconino, 

 Yavapai, Gila and Pinal cos.), scattered or rare, summer; widely introd. in temp. 

 N. A. from Euras. 



8. Agrostis exarata Trin. Spike bentgrass. Fig. 109. 



Tufted perennial; culms 3-9 dm. long, 1-2 mm. thick (in ours; more robust else- 

 where), leafy, mostly erect or the lower internodes reclining and substoloniferous; 

 ligule a scale 3-5 mm. long; blades 4-20 cm. long. 2-8 mm. broad, flat; 

 panicle 1-3 dm. long, 10-25 mm. thick, rather lax and often somewhat interrupted 

 toward the base, the branches many-flowered, appressed; glumes 2.5-3 mm. long, 

 narrowly acuminate; lemma 1.7-2.3 mm. long, not awned (in ours; elsewhere 

 apically awned); palea absent. 



Wet places such as marshes, wet meadows, flowing water and along streams, at 

 high elev. in Tex. Trans-Pecos mts., rare, in N. M. (Union, Guadalupe and 

 Otero cos.) and Ariz. (Apache to Coconino, s. to Cochise and Pima cos.), late 

 summer; w. Can. and w. U. S. (including Alas.), e. to S. D., Neb. and in the mts. 

 to w. Max. 



28. Cinna L. Woodreed 



Tall perennials with flat blades and close or open panicles; spikelets 1 -flowered, 

 disarticulating below the glumes, the rachilla forming a stipe below the floret 

 and produced behind the galea as a minute bristle; glumes equal or subequal, 

 1- to 3-nerved; lemma similar to the glumes, nearly as long, 3-nerved, bearing a 

 minute short straight awn just below the apex or rarely awnless; palea 1 -keeled. 



A genus of 4 species in Eurasia, North America and South America. 



1. Spikelets 5 mm. long; panicle rather dense, the branches ascending 



1. C. arundinacea. 



1. Spikelets 3.5-4 mm. long; panicle loose, the branches spreading or drooping 

 2. C. latifoUa. 



1. Cinna arundinacea L. Stout woodreed. Fig. 110. 



Clumped perennial with short thick rhizomes; aerial culms erect, 7-15 dm. tall, 

 2-5 mm. thick, leafy; ligule a stramineous scale 2-3 mm. long centrally and with 

 long auricles laterally; blades 15-37 cm. long, 7-14 mm. broad near the middle, 

 tapering to both ends, flat; panicles 15-32 cm. long, ellipsoidal, the numerous 

 branches ascending or rarely spreading, densely-flowered; zone of abscission just 

 below the glumes; spikelets one-flowered, falling as a unit, strongly laterally 

 compressed, with keeled scales; first glume 4-4.5 long; second glume 5-5.5 mm. 

 long; lemma 5.5-6 mm. long, bearing dorsally just below the tip a minute awn 

 equaling the tip of the lemma (use lens). 



Moist usually sandy soil, floodplains and stream banks in forests, in wet 

 meadows and along sluggish streams, in Okla. (Sequoyah Co.) and e. Tex., infre- 

 quent, Aug.-Sept.; all of e. U. S. w. to S. D., Neb., Kan., Okla. and Tex. 



234 



