Figure 325. — Agropyron parishii, X 1. (Type.) 



242 MISC. PUBLICATION 200, U. S. DEPT. OF AGRICULTURE 



awn of lemma nexuous or finally di- 

 vergent, 1.5 to 3 cm. long. % — 

 Ballast near Portland, Oreg. Native 

 of Asia. Cultivated in experiment 

 plots in California, Washington, D. 

 C, and Mississippi in the last century 

 under the unpublished name Agro- 

 pyrum japonicum. Tracy used the 

 name in print in economic notes. (See 

 Synon} T my.) 



21. Agropyron parishii Scribn. and 

 Smith. (Fig. 325.) Culms 70 to 100 

 cm. tall, the nodes retrorsely pubes- 

 cent; blades flat or loosely involute, 

 2 to 4 mm. wide; spike slender, nod- 

 ding, 10 to 25 cm. long, the internodes 

 of the rachis 1.5 to 2.5 cm. long; 

 spikelets 4- to 7-flowered, mostly 

 about 2 cm. long, narrow, appressed, 

 the rachilla joints scaberulous, about 

 2 mm. long; glumes 3- to 5-nerved, 1 

 to 1.5 cm. long, acute; lemmas acute 

 or with a slender awn 1 to 8 mm. long; 

 palea as long as the lemma, obtuse. 

 2[ — Canyons and rocky slopes, 

 California (Monterey and San Benito 

 Counties and San Bernardino Moun- 

 tains) ; rare. Agropyron parishii var. 

 laeve Scribn. and Smith. Nodes 

 glabrous; awns usualty 1 to 2 cm. 

 long. % — California, more wide- 

 spread than the species. 



22. Agropyron saxicola (Scribn. 

 and Smith) Piper. (Fig. 326.) Culms 

 tufted, erect, 30 to 80 cm. tall; 

 sheaths glabrous or sometimes pubes- 

 cent; blades flat to loosely involute, 

 glabrous or sometimes pubescent, 1 to 

 4 mm. wide; spike 5 to 12 cm. long, 

 the rachis tardily disarticulating, the 

 internodes more or less scabrous on 

 the angles, 5 to 10 mm. long; spikelets 

 imbricate, sometimes in pairs, about 

 twice as long as the internodes of the 

 rachis, 4- to 6-flowered, the rachilla 

 minutely scabrous; glumes narrow, 2- 

 nerved, the nerves sometimes ob- 

 scure, sometimes with a third faint 

 nerve, awned, the awn divergent, 5 to 

 20 mm. long, sometimes with a tooth 

 or short awn at the base of the main 

 awn; lemmas about 8 mm. long, the 

 awn divergent, mostly 2 to 5 cm. 

 long, sometimes with 1 or 2 short ad- 



Figure 326. — Agropyron saxicola, X 1. (Type.) 



blades commonly 4 to 6 mm. wide; 

 spike 15 to 30 cm. long, nexuous, the 

 rachis more slender; spikelets distant, 

 mostly 3- to 5-flowered ; glumes short- 

 awned; awns of the lemmas stouter, 

 mostly 2 to 3 cm. long. 01 — Rocky 

 slopes, Avestern Texas, New Mexico, 

 Arizona, Nevada, California (Eel 

 Ridge), and Chihuahua, Mexico. 



Agropyron semicostatum (Steud.) 

 Nees ex Boiss. Blades flat; spike nod- 

 ding, 10 to 20 cm. long; spikelets 

 several-flowered, imbricate; glumes 

 several-nerved, much shorter than the 

 spikelet, acute but scarcely awned, 



