STANDLEY — ^FLORA OF GLACIER PARK. 293 



8. Bromus richardsonii Link. Common at low and middle altitudes, in woods or 

 meadows. B. C. to N. Mex. and Sask.— Plants rather robust, 1 meter or more tall; 

 blades elongate, glabrous or nearly so; panicles drooping, the slender flexuous 

 branches fascicled; spikelets 2 to 3 cm. long, on flexuous pedicels. 



26. AGROPYRON Gaertn. Wheatgrass. 

 Erect perennials with simple culms and slender, mostly erect spikes. 

 Plants with creeping rootstocks, forming a tough sod. 



Lemmas pubescent 1. A. dasystachyum. 



Lemmas glabrous 2. A. smithii. 



Plants without rootstocks; bunchgrasses. 

 Blades, or most of them, involute. 



Lemmas awned 3. A. spicatum. 



Lemmas awnless 4. A. inerme. 



Blades flat or involute-pointed only. 



Spikelets awned 5. A. caninum. 



Spikelets awnless. 



Spikes slender, the spikelets rather distant, green 6. A. tenerum. 



Spikes relatively short and thick, the spikelets closely overlapping, usually 

 \dolet-tinged 7. A. violaceum. 



1. Agropyron dasystachyum (Hook.) Scribn. Collected at Summit by Griffiths. 

 Idaho to Sask. and Wis.— Culms 50 to 100 cm. tall, with narrow, commonly somewhat 

 involute blades, and grayish spikes 8 to 15 cm. long; lemmas awnless. 



2. Agropyron smithii Rydb. Colorado bluestem. Frequent on the east slope 

 at low or middle altitudes, on prairie or open hillsides. B. C. to Ariz., Tex., and 

 Mo.— Culms 40 to 100 cm. tall, rather wiry; blades fii-m, more or less involute; 

 spikes 10 to 15 cm. long, the spikelets overlapping, the lemmas firm, sharp-pointed. 



3. Agropyron spicatum (Pursh) Scribn. & Smith. Frequent at low and middle 

 altitudes, on open slopes or praiiie. Yukon to Calif., N. Mex., and Mich.— Culms in 

 dense tufts, slender, wiry; blades usually elongate; spike slender, the axis some- 

 times flexuous; lemmas with a divergent awn 1.5 to 3 cm. long. 



4. Agropyron Inerme (Scribn. & Smith) Rydb. Granite Park, on open rocky 

 slopes. B. C. to Utah and Wyo.— Plants resembling the preceding, but the lemmas 

 blunt or with an occasional one awned. 



5. Agropyron caninum (L.) Beauv. Frequent at nearly all altitudes, on prairie or 

 open slopes or in woods. Calif, to N. Mex., Mich., and N. S.; also in Eur.— Culms 

 60 to 100 cm. tall, often rather robust; blades 3 to 8 mm. wide; spike sometimes 

 elongate, usually dense, often somewhat 1-sided because of the twisting of the axis; 

 awns slender, 10 to 25 cm. long. 



6. Agropyron tenerum Vasey. At low and middle altitudes, on open slopes or in 

 woods. B. C. to Calif., N. Mex., and Minn.— Plants commonly in large clumps, GO 

 to 100 cm. tall; blades 3 to 6 mm. wide; spike slender, mostly 15 to 20 cm. long, often 

 nodding at the summit. 



7. Agropyron violaceum (Hornem.) Lange. Frequent, chiefly above timber line, 

 but also in exposed places at middle altitudes. Alaska to N. Mex., Nebr., N. Y., and 

 Greenl.— Culms mostly less than 60 cm. tall, often geniculate at base; blades rela- 

 tively thin; spike mostly short and thick, with crowded, rather soft spikelets. 



27. TRITICUM L. 



1. Triticum aestivum L. Wheat. East entrance, along the railroad, both the 

 bearded and beardless forms collected. Native of the Old World; cultivated and 

 sometimes escaping.— An erect annual, forming stools, 50 to 100 cm. tall, with flat 

 blades and thick stiff spikes, the broad plump spikelets awned or awnless. 



