MANUAL OF THE GRASSES OF THE UNITED STATES 



237 



\ 



It. 



Figure 454.— Ag- 

 ropyron vulpi- 

 n u m , X 1 . 

 (Type.) 



tapering into an awn; lemmas obscurely 5-nerved, the nerves becoming 

 prominent toward the tip, the awn straight or nearly so, usually 1 to 

 3 cm long. % — Moist meadows and 

 open woods, Newfoundland to Alaska, 

 south to the mountains of Maryland, to 

 Indiana, Nebraska, New Mexico, Arizona, 

 and California (fig. 456). Said by Malte 

 to be self -pollinated. This is the species 

 which has generally been called by Am- 

 erican botanists A. caninum (L.) Beauv., 

 which is a European species, differing in 

 having 3-nerved glumes. 



AGROPYRON SUBSECUNDUM Var. ANDf- 



num (Scribn. and Smith) Hitchc. Culms 

 mostly not more than 50 cm tall, loosely 

 tufted, usually geniculate at base; lower 

 sheaths pale, usually papery; spike short; 

 awns mostly 5 to 10 mm long, often curved. 

 An alpine form of mountain meadows. 

 Ql — Montana to Washington, south to 

 Colorado and Nevada. 



Agropyron caninum (L.) Beauv. Glumes 

 3-nerved. % — Ballast near Portland, 

 Oreg. ; adventive from Europe. 



13. Agropyron pauciflorum (Schwein.) 

 Hitchc. Slender wheatgrass. (Fig. 457.) 

 Resembling A. subsecundum; sheaths glabrous 

 or rarely pubescent ; blades mostly 2 to 4 mm 

 wide; spike usually more slender, 10 to 25 cm 

 long, sometimes unilateral; spikelets from 

 rather remote to closely imbricate; glumes 

 and lemmas awnless or nearly so. % {A. 

 tenerum Vasey.) — Labrador to Alaska, south 

 to the mountains of West Virginia, Missouri, 

 New Mexico, and California; northwestern 

 Mexico (fig. 458). Alpine plants lower, 

 with shorter denser commonly purplish 

 spikes, resemble A. subsecundum var. 

 andinum but are awnless. They have been FlGURE 4 55 , 

 referred to A. violaceum (Hornem.) Lange, 

 an arctic species, and to A. biflorum 

 (Brignoli) Roem. and Schult. 



Agropyron pseudorepens 

 Scribn. and Smith. Appears to 

 be distinct, differing in the 

 slender creeping rhizomes and 

 villous rachilla joints. A. pseu- 

 dorepens var. magnum Scribn. and Smith may 

 be a large form. 01 — Open ground, thick- 

 ets, and open woods, South Dakota to 

 Washington, south to New Mexico, and northern Arizona; Michigan 

 (Grand Island). 



14. Agropyron latiglume (Scribn. and Smith) Rydb. (Fig. 459.) 

 Culms loosely tufted, curved or geniculate below, 20 to 50 cm tall; 



Agropyron sub- 

 secundum, X 1. 

 (Shear 452, 

 Mont.) 



Figure 453.— 

 Agropyron 

 griffithsii, X 1. 

 (Williams and 

 Griffiths 16 4, 

 Wyo.) 



Figure 456.— Distribution of 

 Agropyron subsecundum. 



