596 POACK.IO. 



long, 3-nerve(l ; floral glume 4 nun. long, the awn I 5 nun. long. 

 Anthers 1.5 mm. long. 



Michigan (Benzie, Bay, Crawford, and Macomb countie-s), 

 probably indigenous; also in Europe, 



A pretty careful examination of many j>lants lias been made, 

 all compared with llackel's description. 



Subsp. sulcata Hack. Monog. Fest. Eu. 100 (188;J). F. .siilrafx 

 Hack. Bot. Centralb. 8:405 (1881). 



Culms 70 cm. high, with two nodes, leaf-blades 5-T-nerved, 

 capillary, 0.5-0.6 mm. diam. Panicle 5-10 cm. long. Spikelets 

 8-10 nun. long, 5-flowered. 



Montana, Canby d; Scribner 407. 



Var. MARGINATA Hack. 1. c. 



Densely tufted ; culms slender. 30-40 cm. high, with 2 nodes, the 

 upper one one-fifth to one-third the heiglit of the culm, angled be- 

 low the panicle. Sterile shoots numerous, the leaves half as long 

 as the culm, the blade obtuse, conduplicate, 3-ribbed, the 

 sclerenchyma in three bands (at tlie keel and the margins only), 

 0.6-0.8 mm. diam., rigid, glaucescent; ligule obsolete, ciliate, 

 blades of the culm 3-6 cm. long. I'anicle 3-8 cm. long, ovate, 

 spreading when in flower, rachis and rays scaln'ous. Spikelets ob- 

 long-lanceolate, 6-10 mm. long, a-8 f'.GVvored; empty glumes 

 sliglitly unequal, first oljjong, secoml linear-oblong, subulate, ex- 

 tending two-thirds of the way over the floral glume next above: 

 Horal glume linear-lanceolate; 4.5-5 mm. long, glabrous, smootii, 

 nuicronate or aristate; palea linear-oblong, with ~ short teeth, 

 scabrous on tlie keels. Anthers 2.2 mm. long. 



Michigan, HeaJ 135; Colorado, Clarl- ^O^jS. 



In cultivation on the lawns, Agricultural College, Michigan, 

 and elsewhere, often mistaken for var. (InriuHCulu. 



Subspecies Borderii JIack. Monog. Fest. Eu. 113 (1882), F. 

 Borderi i Ihn^k. Bot. Centralb. 8:406 (1881). 



Culms firm, smooth, J 0-20 (in this case 40) cm. high, with 

 one node, and another among tlie lower leaves, lilades of sterile 

 shoots O.T-0.8 mm. diam., rigid, glabrous, compressed, the 

 sclerenchvnni in 9 bands. Sheaths smooth, entire almost to the 



