Flora of the Palousc Region 2? 



let-bearing to the base: spikelets 8-12 mm. long, 5-8-flowered: flowering 

 glumes minutely scabrous, 4-5 mm. long. A very variable species or aggre- 

 gate, no one of our several forms being typical. 



P. saildbergii Vasey. Perennial, glabrous, not glaucous, tufted: the 

 culms 15-50 cm. tall: basal leaves numerous, the blades 5-10 cm. long, linear; 

 culm leaves two, low down, the blades 1-2 cm. long, the sheaths usually 

 purple: panicle 4-7 cm. long, narrow, the ascending branches in twos or 

 threes, spikelet-bearing near the top: spikelets 2-4-flowered, usually purplish: 

 flowering glumes oblong, 3.5 mm. long, sparsely pubescent above, villous 

 near the base. The commonest native species; flowering early. 



47. GLYCERIA. 



Inflorescence a panicle, spikelets few-inany-flowered, terete, or 

 somewhat flattened: empty glumes obtuse or acute, 1-3-nerved: 

 flowering glumes membranous, obtuse, rounded on the back, 5-9- 

 nerved, the nerves disappearing in the hyaline apex ; palet scarcely 

 shorter than the flowering glume, rarely longer: grain smooth, 

 enclosed in the flowering glume and palet, free, or when dry 

 slightly adhering to the latter. 



Spikelets linear, 1-1.5 cm - long. G. boreaus. 



vSpikelets ovate or oblong, less than 1 cm. long. 



Leaves 6-10 mm. broad: flowering glume 5-nerved. G. pavciflora. 



Leaves less than 5 mm. broad: flowering glume 7-nerved. 



G. XERVATA. 



G. borealis Piper, n. comb. ( Panic ularia borealis Nash.) Culms weak, 

 erect, glabrous, .5-1 m. tall: leaf blades 8-20 cm. long, pale green, nearly 

 smooth; sheaths loose, longer than the internodes: panicle lax, 15-30 cm. 

 long, the branches single or in twos, usually short and erect: spikelets linear, 

 10-15 mm. long: flowering glumes thin, 3.5-4 mm. long, 7-nerved, the 

 nerves minutely hispid. Common in shallow ponds. 



G. paucifiora Presl. Culms .5-1 mm. high, smooth: leafblades io-2ocm. 

 long, nearly 1 cm. broad, acute, scabrous; sheaths nearly equalling the inter- 

 nodes: panicle loose, 15-20 cm. long, usually purplish, its base included in 

 the upper sheath; branches slender, spreading, 2-5 at a node, flower-bearing 

 above the middle: spikelets 4-5 mm. long, 4-6-flowered: flowering glumes 

 prominently 5-nerved, rarely 7-nerved. In moist places or even in water, 

 not rare. 



G. nervata Trin. Culms .5 to 1 m. tall, slender, glabrous: leaf blades 

 15-30 cm. long, 4-5 mm. wide, scabrous above: panicle 6-20 cm. long, long 

 peduncled, its branches in twos and threes, slender and spreading: spikelets 

 2-4 mm. long, 4-7-flowered: flowering glume prominently 7-nerved. In wet 

 places, infrequent. 



48. FESTUCA. 



Inflorescence a panicle: spikelets 2 several-flowered: empty 

 glumes more or less unequal, acute, keeled, 1-3-nerved: flowering 

 glumes membranous, narrow, rounded on the back, 3-5-nerved, 

 acute or awned at the apex; palet scarcely shorter than the flow- 



