328 POACE^. 



Siberia. Wheu mature the panicles break away and are carried for 

 long distances by the wind. 



12. A. perennans (Walt.) Tuckerm. Am. Journ. Sci. (II.)45: 

 44(1843). Thix Grass. Coruiicopice j/erouians ^Xalt. Fl. Carol. 

 73 (1788). Tncliodium decumhens Michx. Fl. Bor. Am. 1 : 42 

 (1803). T. perennans Ell. Bot. S. C. & Ga. 1:99 (1823). 



Culms weak, slender, erect from a decumbent base, 30-60 cm. 

 high. Sheaths smooth, about the length of the internodes; ligule 

 3-4 mm. long; blades flat, thin, scabrid, tlie upper 10-15 cm. 

 long, 2-4 mm. wide. Panicle often included at the base, diffuse, 

 pale green, 10-18 cm. long; rays capillary in clusters of 2-4-10, 

 the clusters 3-4 cm. distant, some rays G cm. long, dividing and 

 flower-bearing from near the middle. Spikelets acuminate, scabrid 

 on the keels, 2-2.5 mm. long; first glume the longer; floral glume 

 thin, awnless or rarely short-awned, 1.7 mm. long, truncate-toothed, 

 5-nerved; palea or minute. Nearly allied to A. Injemalis. 



Damp shade; Jaly, August, New England, Michigan, to Texas. 



13. A. Diegoensis Vasey, Bull. Torr. Club, 13 55 (188G). A 

 foliosa Vasey, Bull. Torr. Club. 10:63 (1883). A. multicidmis 

 Vasey in numerous distributions. 



Culms smooth or scabrid, stout, 60-100 cm. high, sometimes 

 with rootstocks. Ligule acute, 4 mm. long; blades of the culm 

 about 5 in number, erect, scabrid, flat, or involute, 10-18 cm. long, 

 2-4 mm. wide. Panicle lanceolate, 15-20 cm. long, light green; rays 

 erect in clusters of 5-10, the lower clusters 3-5 cm. distant, the 

 longest ray 5 mm. long and flower-bearing above the middle, the 

 shorter bearing spikelets to the base. Spikelets 2.5-3 mm. long; 

 first glume scabrid on the keel, ovate-acute, second smooth, shorter, 

 1-3-nerved ; floral glume broad-oval when spread, obtuse, minutely 

 scabrid, 1.8-2 mm. long, 4-nerved above, awn near the middle, 

 minute or obsolete, hairs at the base very few and short; palea 0. 



"The panicle resembles that of A. alba, but is narrower, 

 shorter, and more closely flowered." Vasey. 



Washington, Hoioell; Oregon, Bolander; California, Orcutt. 



14. A. Scouleri Trin. Mem. Acad. St. Petersb. (VI.) 6:329 

 (1845). -1. rc2)ens Scribn., not Sincl. 



