362 POACE.E. 



A. Panicle loosely spreading, almost trichotomous. ... 1 



B. Panicle narrow and dense, spikelike 2 



1. A. CARYOPHYLLEA L. Sp. PI. 66 (1753). A. cajnllaris 

 Salzm. Steud. Norn. Ed. 2, 1:44 (1840-41). There are at least 

 17 other synonyms. 



A slender and elegant tufted annual, 10-20 cm. high. Ligule 

 2-4 mm. long; blades 1-3 cm. long, soft, narrow, soon involute 

 and twisted. Panicle loose and spreading, rays in pairs or threes. 

 Spikelets erect, silver-shining; emj^ty glumes about 2.3 mm. long, 

 ovate, acute, sub-scarious, 1-nerved; floral glume shorter, 2 mm. 

 long, dorsal awn projecting over 1 mm. above. 



Generally distributed over the area of the genus. Introduced 

 and naturalized in various portions of the United States from Del- 

 aware to California. 



2. A. PR.ECOX L. Sp. PI. 65 (1753). A. pusilla Schur, Enum. 

 PI. Transs. 754 (1866). 



A slender annual, 4-12 cm. or rarely more in height. Ligule 

 about 2 mm. long; blades 5 in number, 0.5-2 cm. long, soft, 

 narrow, soon involute and twisted. Panicle contracted, 1-2 cm. 

 long. Spikelets erect, seldom over 10-20 in number; empty glumes 

 scarious, shining, ovate, acute, 2.5 mm. long, 1-nerved; floral 

 glume 2 mm. long. 



A west European and Mediterranean grass, introduced into 

 Delaware, Pennsylvania, and elsewhere. 



75. (153). Weingaertneria Bernh. Syst. Verz. Erf. 23:51 

 (1800). Xame used earlier. Corynepliorus Beauv. Agrost. 90, t. 

 18, f. 2 (1812). 



Spikelets 2-flowered, in a loose panicle, rachilla articulate below 

 the floral glumes and produced beyond them. Glumes thinly 

 scarious, 2 empty ones subequal, acute, awnless; floral glume 

 shorter, hyaline, entire, with a fine awn dorsally attached below the 

 middle, articulate near the middle, where there is a tuft of short 

 hairs, lower ]iart firm and twisted, the upper part more slender with 

 a clavate apex; palea shorter than its glume, narrow, 2- toothed. 

 Stamens 3. Styles short, distinct. Grain included, more or less 

 adherent to the glume and palea. 



