210 PRACTICAL BOTANY. 



elongated style. A rudiment of a second flower, in the form 

 of a pedicel, close to the upper pale. 



Cynodon Dactylon, Pers. 



Gr. III. 20. 

 W. V. bQ, 



A pair of spikes at the summit of the peduncle. 

 Glumes not keeled, membranaceous, rounded (one of them, 

 by theory, a pale !). Styles 2. No pedicel-like rudiment. 



Faspalum (in two spec). 



Gr. Yll. 58. 



W. II. 15. 



574. Flower surrounded at the base by a tuft of copi- 

 ous, white, bristly hairs, their length at least one third of their 

 own. Spikelcts lanceolate, acute. Glumes keeled or boat- 

 shaped. Pales naked ; lower one either awnless, or with a 

 dorsal or almost terminal awn. Flower often with a pedicel 

 at the base (a nidimentary flower). ( Calamagrostis.) ... 575 



Flower without, or with scarcely perceptible hairs 

 at the base. Pales naked or hairy. Glumes sometimes 

 awned, or bristle-pointed 576 



575. Lower glume shorter than the upper, and shorter 

 than the pales. Lower pale 1-nerved and entirely awnless, 

 tlie upper strongly 2-kceled. Panicle open, pyramidal. 

 Rudiment none. § Calamovilfa, Gray. 



{^Calamagrostis brevipilis, Torr., and 



Calamagrostis longifolia, Hook.) 



Lower glume longer than, or about as long as the 



upper; both glumes commonly longer than the pales. 



Panicle open, or spiked-contracted. A rudimentary 2d 



flower, in the form of a plumose pedicel, sometimes present. 



§ Calamagrostis. 

 (§ Calamagrostis Proper^ Gray, and 

 %Ammophila, Host.) 

 Gr. n: 12. 

 W. L 9. 



576. Glumes both, rarely only one of them, with an awn 

 or an awn-like bristle 577 



Glumes awnless, or merely sharp-pointed 580 



577. Glumes awn-pointed, or altogether bristle-form, 6 

 in number, placed side by side, in front of the 3 spikelets 



