CIILOUIDK.K. 403 



extending; into a alpiidcr iiwii or rarely awnlcss. Tlio 1 to sovi'ral 

 eni[ity iriiiincs towiinlrt tlio aju-x of tlie rjicliilla short, liroad and 

 lriincat(! or narrow, often awned or bristle-pointcil, rarely awnlcsa; 

 palea scarcely shorter than its f;;liiine, folded, nerves prominent. 

 Stamens ;{. Styii-s ('istinet, sti^'nias feathery. (Jraiii included hy 

 the <,dnme, but not adherent, ohlonj^-lanccolate or almost linear, 

 subterete or nearly :J-sided, rarely grooved. I'ericarp very thin 

 and loose as in Spnrolmlns. Mostly perennials, eulina compressed, 

 bhuU'8 Hat, often with cross-veins. Spikes solitary or in pairs, erect, 

 or many and digitate at the apox of the terminal peduncle. Tlie 

 iloral glume often clothed with hairs. 



It is a natural though somewhat polymorphous genus. In u 

 number of rij)ccies the upper empty glumes are broad and truncate 

 at the apex. 



There are forty species, widely dispersed in tho warmer regions 

 of the world. 



A. Floral glume with liairs 2-2.5 mm. long 1, 3 



B. No conspicuous hairs on the floral glume (a) 



a. Awns prominent, si)ikelets rather remote, no spikelets on 



rootstocks 3 



a. Awns prominent. S|)ikelets of the panicle rather remote; 



spikelets on the rootstocks also 4 



a. Awns very short, spikelets crowded (b) 



b. Empty glumes longer than the floral glumes. . . 5 



b. Empty glumes as long as the Iloral glumes. . . . G 



b. Empty glumes shorter than the Iloral glumes. . . (c) 



c. Spikes about li cm. long, light-colored. ... 7 



c. Spikes over 5 cm. long, brown when mature. . (d) 



d. Spikes 1-3 S 



d. Spikes ;5-8 !> 



(1. Spikes 8-30 10 



1. C. elegans H. W. K. Nov. Gen. et Sp. I : IGO, (1815). C. alba 

 Presl. Kel. lla'nk. 1 : 289 (18:]0). 



Culms 30-00 cm. high. Sheatlis sliglitly intlatetl ; blades lan- 

 ceolate, 3-15 cm. long, slightly scabrous. Spikes 8-13, umbellate, 

 4-G cm. long, sometimes included, with internodes 1 nnn. long. 



