446 GRAMINEA. 



f Spikelets one-flowered ; glumes three only, awnless, the 

 j outer two equal, and enclosing the rest 



^1 p. 446. PASPALUM. 



[ Spikelets of one or two flow^ers, the upper one male. . d 



, J Glumes without awns. e 



(Glumes awned f 



r Glume i shorter than the others. . . /. 449. panicum. 



e \ Glume i equal to ii or nearly so, spikelet not jointed to its 



[ pedicel below glume i but above ii. . /. 447. isachne. 



f Spikelets in bunches of three to five ; glume i long awned. 



r\ p. 450. OPLISMENUS. 



I Spikelets in spikes or open panicles ; glume iv awned, 



[ glume i not p. 450. arundinella. 



f Both spikelets of a pair with ovary. . /. 453. pollinia. 

 I Both spikelets two-flowered, stalked spikelet male. . . . 



I /. 454. ISCH^MUM. 



g<[ Spikelets one-flowered, sessile one with ovary, stalked one 

 I male. Inflorescence various. /. 451. andropogon, etc. 

 I Spikes bunched in the axils of large bracts. 



I A 459- ANTHISTIRIA. 



B. FOACE.^. 



, r Spikelets producing one grain only : leaves narrow. . i 



(Spikelets with more than one fert'le flower j 



[ Spikelets one-flowered, slender, aw^ned, in open panicles, 

 . J not jointed to their stalks. . p. 456. calamagrostis. 

 ^J Spikelets two-flow^ered, awnless ; a swamp grass. . . . 



I /. 457. CCELACHNE. 



. J Spikelets awned k 



^ (Spikelets not awned m 



r Awns three : spikelets in close spikes, p. 458. tripogon. 

 k -J Awn single, fixed halfway down the glumes. /. 457. avena. 

 [ Awn single, fixed at the end of the glume ..... 1 

 { Spikelets in panicles . glumes round-backed, many-nerved. 



J J />. 462. BROMUS. 



[ Spikelets sessile, in spikes. . . p. 462. brachypodium. 

 \ Flowers eight or more : glumes strongly three-nerved. . . 

 I /. 459. eragrostis. 



^1 Flowers few: glumes five to seven nerved. . /. 461. poa. 

 [ Spikelet triangular with broad base. . . . p 464. briza. 



PASPALUM. F.B.I. 173 I. 



Spikelets one-flowered, flattened against the axis of 

 the spike, jointed to their pedicels. Two outer, empty, 



