334 POACE^. 



and with much shorter and erect branches, and a firmer culm." 

 Vasey. 



Oregon, IIoivcIl in 1881; Washington, SuJcsdorf. 



24. A. attenuata Vasey, Coult. Bot. Gaz. 11:337 (1886). 

 Perennial; culms smooth, slender, 00-90 cm. high. Sheaths 



smooth, shorter than the internodes; ligule 3-5 mm. long; blades 

 scabrous, about 2 mm. wide, tlie lower ones 5-10 cm. long, those 

 above, 3 in number, 8-18 cm. long. Panicle sometimes exserted, 

 25 cm. long, pyramidal or narrower, thin, 10-20 cm. long; rays 

 capillary, rough, bearing few spikelets above the middle, the lowest 

 ones on long pedicels 10-12 cm. long, and 10-15 in a cluster, on 

 smaller panicles in threes, fives, or sevens. Spikelets purplish, 2.5-3 

 mm. long, oblong-lanceolate, scabrous on the keels, first glume a 

 little longer than the second, both 1-nerved; floral glume broadly 

 oval, obtuse, 5-nerved, 1.5-2.3 mm. long, a few very short hairs on 

 the callus at the base, unawned ; palea 0. Very variable as received 

 from collectors. 



Washington, Henderson 1611, collected near the ocean in moist 

 fields; Oregon, Hoioell^ springy places along the Applegate, also 

 near Mt. Hood. 



25. A. altissima (Walt.) Tuckerm. Am, Journ. Sci. 45:44 

 (1843). Cornueopm altissimun Walt. Fl. Car. 74 (1788). Trichodium 

 elatum Pursh, Fl. Am. Sept. 1:61 (1814). 



Perennial; culms erect, stout, 00-90 cm. high. Sheaths 

 scarcely smooth, mostly longer than the internodes; the upper lig- 

 ule acute, 5-9 mm. long; blades of sterile shoots narrow and mostly 

 involute, the upper flat, scabrous, 10-15 cm. long, 3-6 mm, wide. 

 Panicle exserted, spreading, green or purple, 15-25 cm. long, rays 

 scabrous in rather remote clusters of 5-10 below, branching above 

 the middle, flower-bearing in dense clusters along the upper third 

 of the branches. Spikelets crowded, 3.5-3 mm, long; empty glumes 

 acuminate, scabrous on the keels, first a little the longer; floral 

 glume rather firm, broad, awnless, a little shorter than the second 

 empty glume ; palea 0. 



New Jersey, Scrihner for U. S. Dept. Agricul. 300; Mississippi, 

 Tracy ; California, Bolander Q103. 



