346 POACEiE. 



Spikelets with empty glumes subequal, about 5 mm. long, lanceo- 

 late, acute when spread, appearing keeled, first 1-nerved, second 

 obscurely 3-nerved, rudiment 1.5 mm. long Avitli a pencil-tuft still 

 longer; hairs in 2 tufts, 1 mm. long; floral glume scabrid, oval, 

 acute, 4 mm. long, the rather slender twisted and bent awn attached 

 Just below the middle and exceeding the empty glumes about 2 mm; 

 palea lanceolate, nearly as long as its glume. 



Mexico, Pringle 1422 in 1887, 9000 feet altitude. 



15. C. lactea (Suksdorf). Deyeuxia ladea Suksdorlf in herb. 

 (1890). 



Perennial; culms stout, scabrous, 90 cm. high. Sterile shoots 

 few. Leaves scabrous; sheaths of the culm half or two- thirds as 

 long as the internodes; ligule 2-3 mm. long, decurrent; blades 

 20-30 cm. long, 5-7 mm. wide. Panicle slightly exserted, silvery 

 green, rather thin, pyi'amidal, 8-12 cm. long, rays in half-whorls of 

 4-6, the longest 3-5 cm. long, flower-bearing on the upper half. 

 Spikelets with empty glumes subequal, 5-6 mm. long, lanceolate 

 when spread, first 1-nerved, second 3-nerved; hairs surrounding 

 the base of the floret numerous, 3.5 mm. long, rudiment 0.5 mm. 

 long, pencil-tufted: floral glume oval, acute, 4.3 mm. long, the 

 slender awn attached 1 mm. above the base and extending to the 

 tips of the empty glumes; palea 2.5-3 mm. long. Anthers 2 mm. 

 long. Nearly allied to D. Pi-mglei Scribner. 



Washington, Svksdorf 1022; banks of the North Fork of 

 Nooksack Elver, near Mount Baker. 



16. C. Aleutica Bong. Veg. Ins. Sitcha 171 (1831). Deyeuxia 

 Aleutica Munro. Hook. Trans. Linn. Soc. 23: 345 (1862). 



Perennial; culms stout, erect, 60-150 cm. high. Sheaths loose, 

 shorter than the long internodes; ligule ovate or truncate, 4-7 mm. 

 long; blades of the culm ratlier firm, scabrous, flat or involute, 

 20-40 cm. long, those of sterile shoots longer, 5-8 mm. wide. 

 Panicle much or little exserted on a scabrous peduncle, rather loose, 

 slightly interrupted, nearly acute, erect, 12-25 cm. long, 2-3 cm. 

 broad ; rays in crowded clusters, 4-8 cm. long, the branches bearing 

 spikelets for nearly their whole length. Spikelets pale or brownish 

 purple, elliptical-lanceolate, 5-6 mm. long, usually longer than their 



