50 



produced beyond the flower in a short bristle ; outer glumes per- 

 sistent, unequal, thinly membranaceous, keeled, acute, not awned, 

 upper one larger, three-nerved ; flowering glume somewhat shorter, 

 membranaceous, apex shortly two-toothed, with a slender awn from 

 the back below the apex; palet thin, rather shorter than its glume, 

 two-keeled and two-toothed. 



1. A. spica venti, Beauv. (Agrostis spica-venti, JL.) Introduced on 

 ballast. 



Deyeuxia, Clarion, (Calamagrostis of American authors.) 



Spikelets one-flowered, in a contracted or open panicle, usually 

 with a bristle-like or penicillate hairy rudiment opposite the palet, 

 (a continuation of the rhachilla ;) outer glumes about equal, keeled, 

 awnless, membranaceous, or scariose ; flowering glume usually with 

 a ring of hairs surrounding its base, entire or two to four toothed, 

 usually bearing an awn on the back ; palet narrow, thin, two-nerved, 

 two-keeled. 



1. D. Aleutica, Vasey. (C. Aleutica, Trin.) California to Alaska. 



2. D. Bolanderi, Vasey. (C. Bolauderi, Thurb.) California. 



3. D. Breweri, Vasey. (C. Breweri, Thurb.) California. 



4. D. Canadensis, Beauv. Blue joint. 



A stout, erect, tall, perennial grass, growing chiefly in wet, boggy 

 ground or in low, moist meadows. Its favorite situation is in cool, 

 elevated regions. It prevails in all the northern portions of the 

 United States, in the Rocky Mountains, and in British America. 

 In those districts it is one of the best and most productive of the 

 indigenous grasses. It varies much in luxuriance of foliage and 

 size of panicle, according to the location. The culms are from 3 

 to 5 feet high, stout and hollow, hence in some places it is called 

 the small reed-grass. The leaves are a foot or more long, flat, from 

 a quarter to nearly half an inch wide, and roughish ; the stem and 

 sheaths smooth. 



5. D. confinis, Kth. New York to the Rocky Mountains. 



6. D. crassiglumis, Vasey. (C. crassiglumis, Thurb.) California. 



7. D. Cnsickii, Vasey. Oregon and Washington. 



8. D.? deschampsioides, (C. deschampsioides, Trin.) California to 



Alaska. 



9. D.? Halleriana. (2 C. Halleriana, D. C.) Washington Territory. 



