26 POACEAE. 



Calamagrostis albescens Buckl. Stems tufted, 60-100 cm. tall; stem 



■r 4, 2-4 mm. wide; panicle usually narrow and dense, 8-12 cm. long, 



mi, ran ly purple, the branches short and flower-bearing to the 



\ mm. long; lemma shorter than the glumes, obtuse, 4-toothed 



bearing a stout, nearly basal, geniculate awn, as long as or longer 



than itself. The most abundant grass in pine forests. Includes C. suksdorfii 



Sc ribn . 



Calamagrostis macouniana Yascy. Stems 60-120 cm. high, erect, slender; 



lades narrow, Bat, long-attenuate, 15-25 cm. long; panicle 10-12 cm. 



purple, narrow or pyramidal, loose, the branches in fives, slender, naked 



a ; spikelets small, 2-2.5 mm. long; lemma equalling the glumes, 2-lobed 



ai a|H \, bearing a very short straight awn from above the middle of the back. 



banks of the Palouse at Pullman, not common. 



Calamagrostis canadensis (Michx.) Beauv. Similar to C. macouniana, but 

 usually stouter; panicle looser; spikelets larger. In wet meadows and along 



.ins. 



Calamagrostis canadensis acuminata Vasey. Spikelets larger, 4-5 mm. 

 long. With the species in wet meadows and along streams. 



Calamagrostis neglecta (Ehrh.) G., M. & S. Rootstock slender; stems 

 slender, 40-65 cm. high; leaves soft, 1-3 cm. long, smooth; panicle narrow, 

 glomerate and lobed, 5-10 cm. long; spikelets about 4 mm. long; glumes 

 acute; call us- hairs a little shorter than the floret and as long as those of the 

 rudiment ; awn from the middle of the thin lemma or lower, scarcely exceeding 

 it. Spokane County, Suksdorf. 



Calamagrostis hyperborea Lange. Stems tufted, 40-90 cm. high, stiffly 

 leaves stiff, erect, scabrous, somewhat involute; panicle erect, narrow, 

 densely (lowered, 8-12 cm. long; glumes scabrous, acute, 4-4.5 mm. long. 

 In wet meadows, Spokane County. 



43. AGROSTIS. 



Annual or usually perennial grasses with small 1-flowered 

 spikelets, usually in diffuse panicles; glumes membranous, keeled, 

 acute; lemma shorter, obtuse, hyaline, sometimes bearing a dorsal 

 awn; palea shorter than the lemma, sometimes minute or want- 

 ing: grain free, enclosed in the lemma. 



Plants with rootstocks. 



Palea present; panicle usually large. A. alba. 



Palea absent; panicle small. A. pallens 



\ lants tufted, without rootstocks. 



Panicle loose, open. 



J" 1 )' very diffuse; herbage scabrous. A. hyemalis. 



Inflorescence not diffuse; herbage smooth. A. idahoensis. 



l amele narrow, close. 



2.5-3.5 mm. long; panicle 5-30 cm. long; tall 

 ""' I''' inr - A exarata 



Glumes 2 nun. long; panicle 3-6 cm. long; low alpine 



f ,Unt - A. rossae. 



tt ^n?»° StiS f 1 ?. 8 . L ' c ^' d i° p - a Percnnial w 'th creeping rootstocks; stems erect, 

 ,i ' 1,llll -' s flat, usually scabrous, the sheaths smooth; panicle 



muong, open at first, then contracted, greenish or purple; palea present, 

 "••half the length of the lemma. Abundantly introduced. 



