244 



POACEAE 



12. Agropyron spicatum (Pursh). 

 Scribn. & Smith. 



Blue Bunch Wheat-grass. Fig. 578. 



Festnca spicata Pursh, Fl. Am. Sept. 1: 83. 1814. 



Agropyron divcrgens Nees; Steud. Syn. PI. Glum. 1: 2A7 . 

 1854. 



Agropxron divcrgens tcnuispiciim Scribn.' & Smith, U. S. 



Dept. Agr. Div. Agrost. Bull. 4: 27. 1897. 

 Agropxron vase\i Scribn. & Smith, U. S. Dent. Agr. Div. 



Agrost. Bull. 4: 27. 1897. 



Agropxron spicatum Scribn. & .Smith, U. S. Dept. Agr. Div. 

 Agrost. Bull. 4: 33. 1897. 



Culms erect, tufted, smooth, 60-120 cm. tall ; 

 sheaths smooth; blades rather short; spike 10-20 

 cm. long, the spikelets distant, often shorter than 

 the internodes of the rachis ; glumes acute, nol 

 awned, 8-10 irini. long; lemmas smooth, 12-15 mm. 

 long, the awn 1-2 cm. long, becoming divergent. 



Plains and dry hills in the Arid Transition arid Upper 

 Sonoran Zones; Yukon Territory to eastern Washington and 

 northeastern California, east to Colorado. June-July. Tyjie 

 locality: Idaho. 



Agropyron spicatum pubescens Elmer, Bot. Gaz. 36: 52. 1903. A. spicatum puberulcntum Piper, Contr. 

 U. S. Nat. Herb. 11: 147. 1906. Culms and foliage puberulent. Mount Stewart, Kittitas County, Wash 

 ington, the type locality. 



13. Agropyron saxicola (Scribn. & Smith) 



Piper. 



Rock Wheat-grass. 



Fig. 579. 



Elxmus sa.yicoIus Scribn. & Smith, U. S. Dept. Agr. Div. 

 Agrost. Bull. 11: 56. pi. 15. 1898. 



Sitanion flc.ruosum Piper, Erythea 7: 99. 1899. 



Agropyron fle.Yuosum Piper, Proc. Biol. Soc. Washington 18: 

 149. 1905. 



Agropxron sa.ricola Piper, Contr. U. S. Nat. Herb. 11: 

 1906. 



148. 



Culms 60-100 cm. tall, slender, without rhizomes ; 

 sheaths smooth ; blades short, flat or loosely involute, 

 puberulent or glabrous ; spike 7-10 cm. long, flexuous, 

 long-exserted, the rachis disarticulating; spikelets 

 sometimes m pairs ; glumes subulate or narrowly 

 lanceolate, mostly 2-nerved, narrowed into a slender 

 spreading awn 1.5-2.5 cm. long; lemmas 8 mm. long, 

 smooth and rounded below, 5-nerved and somewhat 

 scabrous above, tipped with a slender spreading awn 

 about 2.5 cm. long. 



Mountain slopes in the Arid Transition Zone; eastern Washington to northeastern California, east to 

 Idaho. July-Aug. Type locality: Okanogan County, Washington. 



14. Agropyron pringlei (Scribn. & Smith) 



Hitchc. 



Pringle's Wheat-grass. Fig. 580. 



Agropxron gmelini pringlei Scribn. & Smith, U. S. Dept. 

 Agr. Div. Agrost. Bull. 4: 31. 1897. 



Agropxron pringlei Hitchc. in Jepson, Fl. Calif. 1: 183. 

 1912. 



Culms 30-40 cm. tall ; blades usually flat, short ; 

 spikes S-10 cm. long, not disarticulating, the florets 

 falling; glumes lanceolate, 3-5-nerved, ending in a 

 short straight awn ; lemmas ending in stout hori- 

 zontally spreading awns about 2 cm. long. 



Gravelly slides and rocky slopes, in the Boreal Zone; 

 Sierra Nevada Mountains. August. Tyi)e locality: above 

 Summit Valley. 



Agropyron glaiicum (Desf.) Roem. & Schult., A. jun- 

 ceum (L. ) Beauv. and A. pungens ( Pers.) Roem. & .Schult. 

 have been found on ballast at l^innton, Oregon (Nelson). 



