652 POACE^. 



Plant rather soft, 25-60 cm. liigli. Leaves of the culms 3, 

 sheaths covering the intemodes, ligule broad, decurrent, toothed, 

 3 mm. long; blades of the sterile shoots thin, flat or irregularly- 

 involute, 5-10 cm. long, 2 mm. wide, abruptly pointed, those of 

 the culm 4-15 cm. long. Panicle exserted, oval or pyramidal, 8-12 

 cm. long, rays in twos and threes, 1.5 cm. distant, tlie longest 4-6 

 cm. long, bearing 3-4 spikelets on the outer three-fifths. Spike- 

 lets lax, oval, 8 mm. long, 3-flowered with a minute rudiment of a 

 fourth, joint of rachilla slender, 1.5 mm. long; emj^ty glumes thin, 

 elliptical, 3-nerved, first 4.5 mm. long, second 5 mm. long; floral 

 glume thinly pubescent on the lower half of the nerves, oval, 5 

 mm. long; palea thinly pubescent on the keels, nearly as long as its 

 glume. 



Unalaska, Turner. 



Its nearest affinities are P. hisjjidida Yasey and P. gracUlima. 



37. P. nemoralis L. Sp. PI. 69 (1753). P. ccBsia Am. authors 

 in part. P. hryophila Triu. Bull. Sc. Acad. St. Petersb. 1:69 

 (1836). There are at least 35 other synonyms. 



A loosely tufted erect perennial, 40-70 cm. high, with no creep- 

 ing rootstocks; culms compressed or subterete, smooth. Sheaths 

 smooth; ligule 0.5 mm. long; blades of culm 4 in number, scabrous, 

 erect, flat or conduplicate, pungent-acuminate, 7-12 cm. long, 2.5-3 

 mm. wide. Panicle linear, ovoid or pyramidal, erect or nodding, 

 5-12 cm. long, rays scabrous, in half-whorls of 4-7, distant 3-3.5 cm., 

 the longest 5-6 cm. long, bearing spikelets almost clustered on the 

 outer half or third, some with pedicels 0.7 mm. long. Spikelets 

 often tinged with violet, elliptical or linear-lanceolate, 3-6-flowered, 

 5-6 mm. long, a long joint of rachilla 0.8 mm. long; empty 

 glumes acuminate, 3-nerved, first ovate-lanceolate, 2.7-3 mm. long, 

 second oval-lanceolate, 3.5 mm. long; floral glume sparingly webbed 

 at base, 3-3.2 mm. long, pubescent (not thinly) on the lateral nerves 

 and lower half of the keel, apex tinged witli yellowish brown, ellip- 

 tical or subacute when spread, obscurely nerved; pulea linear, 

 scabrid oti the keels, 2.7 mm. long. 



Tlie above is a description of well-grown typical plants intro- 

 duced from Europe into Micliigan. 



