POACEAE. 37 



back, 2-toothed, deciduous; the awn arising from be- 

 tween the acute or awned teeth, flat and twisted at base, 

 bent. Palea hyaHne, 2-keeled near the margins, obtuse 

 or 2-toothed. Stamens 3. Styles distinct. Grain free, 

 enclosed in the glume. 



1. D. calif ornica Boland. Perennial, tufted; culms 4-8 dm. 

 high, erect or somewhat decumbent at base; sheaths smooth, villous 

 or bearded at the summit; blades flat or convolute, 10-15 cm. long, 

 3-5 mm. wide, scabrous; spikelets 1-5, terminal, 15-25 mm. long, 

 usually purplish; pedicels slender, spreading, minutely hirsute; 

 empty glumes equaling the spikelet; flowers usually 7; flowering 

 glume about 8 mm. long, hairy on the callus and margins below the 

 middle, teeth about 2 mm, long; awn about equaling the glume, 

 scabrous. 



In dry, usually stony ground, Newhall, Davidson. 



Tribe 6. CHLORIDEAE. Finger-grass Tribe. 



Spikelets 1- several-flowered in 1 -sided spikes or 

 racemes; the racemes digitate or fasciculate, rarely soli- 

 tary; flowering glumes usually keeled, entire and un- 

 armed or toothed and with 1-3 straight awns. 



Spikes 2-6, digitate. 23. Cynodon. 



Spikes not digitate. 



Spikelets imbricated in 2 rows, forming unilat- 

 eral spikes, which are scattered along a 

 commonrachis, 24, Spartina. 



Spikes slender, alternating and more or less 

 remote along a common axis. 25, Leptochloa. 



23, CYNODON Pers. Bermuda-grass. 



Perennial mostly from running rootstocks, with short 

 flat leaves and spicate inflorescence. Spikes digitate, 

 slender. Spikelets 1-flowered, secund. Glumes 3; the 2 

 outer empty, keeled; the third broader membranous, 

 compressed. Palea a little shorter than the flowering 

 glume, hyaline 2-keeled. Stamens 3. Styles distinct. 

 Grain free. 



1. C. dactylon (L.) Pers, Culms 1-3 dm. high, erect, from long 

 creeping and branching stolons, smooth; sheaths glabrous or some- 

 what hairy, crowded at the bases of the culms and along the stolons; 

 ligule pilose; leaves 25-50 mm. long, 4-8 mm, wide, flat, rigid, 

 smooth beneath, scabrous above; spikes 4-5, 12-25 mm, long, digi- 

 tate; rachis flat; spikelets 2 mm, long; empty glumes hispid on the 



