MACLOSKIE: GRAMINE^E. 199 



5's, few-spiculate. Glumes ovate-lanceolate, subequal, not as long as the 

 awnless flowers ; Jhrfll glume woolly-ciliate. One flower usually vivipa- 

 rous, colored amethyst. 

 Magellan. 



5. A. VESTITA Steud. 



Cespitose, fertile and sterile intermixed with dry sheaths. Fertile culms 

 30 cm. tall. Radical leaves narrow-convolute, half as high as the culm. 

 Panicle contracted, 5 cm. long, its rays naked at their base, 2-3 times 

 forking. Spikelets silvery to yellow ; glumes ovate, nearly equalling the 

 flowers ; these surrounded by basal cilia. Floral glume awned at base, 

 the awn not twisted. 



Magellan. 



28. DESCHAMPSIA Beauv. 



Panicle contracted or lax, the spikelets usually 2-flowered, and with the 

 rachilla hairy-prolonged or bearing an additional staminate flower. The 

 2 empty glumes keeled, subacute ; the floral glumes truncate, toothed, 

 dorsally awned about the middle ; palea narrow. Awns mostly keeled 

 (straight in sect. Campelld]. 



Species 20, in cold and temperate regions. Like Aira, but distin- 

 guished by the produced rachilla, or floral rudiment, by longer spikelets, 

 and somewhat stouter habit. 



KEY TO THE SPECIES. 

 A. Panicle lax. 



b. Cespitose. Floriglumes awned. 



c. Low, 5 cm., leafy, the leaves subulate, linear, involute. Straight basal awn. Extra 



rudiment. an'arctica. 



C2. Leaves convolute-setaceous. Spikelets 5 mm., violaceous. Awn protruding. 

 d. Culm 20 cm. Panicle dense. Awn 3 mm. martini. 



d,2. Culm 50 cm., nearly naked. Awn basal. No rudiment. Rays in 2's. 



flexuosa. 

 bz. Erect, 60 cm. Leaves linear, with long ligules. Rays fasciculate. Spikelets 6 mm.; 



mid-dorsal awn as long as floriglume. grandiflora. 



A2. Panicle depauperate. 



b. Awnless. Rays in 2's to 5's. Culm erect, 75 .cm. Leaves short, scabrid. Glumes 



purple and gold. Long infrafloral stipe. pulchra. 



b2. Awned. Rays in 2's. Glumes violet. 



c. Culm slender, naked upwards ; its one leaf convolute-filiform. Floriglume 4 mm., with 



long jointed awn. tenella. 



c2. Culm 30 cm. Leaves few, flat, short. Spikelets 4 mm. Floriglume and its dorsal 

 awn only. 2 mm. brachyphylla. 



