1q. Aivenk. Hairgrass. ere e : if 
Annuals or perennials with narrow or open panicles and shinin ; 
or purplish spikelets. Spikelets 2-flowered, disarticulating abovi 
glumes, the rachilla prolonged beyond the upper floret; glumes nea 
equal, membranaceous, acute or lanceolate; lemmas truncate, erose-dent 
awned from or below the middle, the awn straight, twisted or bent. (Ad 
© Plants annual; spikelets more than 5 mm. long : : a5 ee = 2. 
o Plants perennial; spikelets less than 5 mm. long = z 
"2 Panicles narrow, elongate, the branches ap essed; 
6 amns distinctly exserted fram the ¢ 
Panicles open, the branches spreading; 
ra 
6 awns included or only slightly exserted 
4 Lemmas awned from the middle, the awns twisted 
§& below; leaves relatively short and broad ~ 
4 Lemmas awned from near the base, the awns straight; : 
@ leaves narrow, elongate Cee 
i \4 danthonioides (Trin) Mowe. Culms slender, erect or ascending, 10- 
tall; sheaths snooth; ligules acuminate, 3 mm. long; blades smooth or s 
lous, very narrow, loss than 5 om. long; panicles open, 5-15 om. long, thi 
branches distant, stiffly spreading, naked below, the branchlets stiffly : 
spreading, bearing 1-3 appressed spikelets; glumes nearly equal, lanceolate, 
exceeding the florets; S-nerved, 5-8 mm. long; lemmas 2.5 mm. long, the awis — 
twisted below, geniculate, 4-5 mm. long above the bend; prolongation of the 
rachilla prominent, more than half as long as the lemma, long=pilose above, 
the hairs reaching the tip of the lemma. Q@Qrra dantheddesr danthonictes Ten.) 
* 
Meadows and moist sandy river bottoms. 
——? Coeur d'Alene pweee—20$; Thatuna Hills, Spling—end—Herek0602,.0605-> ™ i 
2+ BD elongata Gook) WMhamne, Culms densely tufted, erect, 15-70 cm. tall or a 
sometimes taller; leaves clustered toward the base, the sheaths smooth; ligules 4 
3-6 mne long; blades lax, very narrow or as much as 2 mme wide, smooth or a 
scabrous; panicles narrow, flexuous, loose, as much as 30 cm. long, the 
branches distant, appressed; glumes 4-6 mm. long, exceeding the florets; lemmas 
2mm. long, the callus and prolongation of the rachilla pilose, the awn Slender, 
straight, not twisted below, 4-5 mm. long. 
Moist meadows and hillsides. ‘ 
