546 GRAMINEJC. (grass FAMILY.) 



t • Glumes distinct, conciiTe or koi'leJ. Palepo membranaceous. Grain free. Spikelets in 

 open or contracted panicles- 



5. SPOROBOLt'S. Flowers awnless. Seed loose in the globose or obovoid jiericarp. 



6. VII.FA. Flowers awnless. Seed adhcrinf; to the closely investing pericarp. 



7. AGKOSTIS. Taleae shorter than the ucurly equal plumes, the lower awned on the bacrf; 



the upper sometimes wanting. 



8. POLYPOGON. Palete much shorter than the long-awned glumes, the lower one truncated 



and toothed. St.amens 3. Panicle spike-like. 



9. CINN A. Pulete rather longer thau the acute glumes, the lower one awned under the apex. 



Stamen 1. Panicle loose. 



10. ML'IILKXIJEHGIA. Lower glume smaller than the upper one. Paleaj bearded at the 



base, tlie lower one mucronate or awn pointed. Stamens 3. 



11. Bl!.\CIlYELyTr{l'M. Lower glume obsolete Lower palea locg-awned. A pedicel of a 



second flower at the back of the upper paleaB. Stamens 2. 



12. C.\L.\MAGUOSTIS. Paleoe surrounded with a tuft of long hairs, the lower awned on the 



back. 



• • • PalesB raised on a hairy stalk ; the lower one awned, indurated, and involute, closely 

 investing the grain. 



13. STIPA Lower palea with a single contorted awn jointed with its apex Panicle short. 



14. STliEPTAClINE. Lower palea with a single straight or curved awn continuous with its 



apex. Panicle elonpiteJ. 



15. ARISTIDA. Lower palea triplc-awued. Panicle elongated. 



Tribe ITT. CHLiORIDK^E. — Spikclets 2 ■ several-flowered (in No. 10 one-flowered), in 

 1-sided spikes. Kuchis jointless. Upper liowers imperfect- Glumes and paleie 2. Spike* 

 racemcd or digitate, rarely single. 



» Spikelets strictly l-flowcred. (See Paspalum.) 



16. SPARTINA. Spikelets flat, imbricated in alternate spikes. 



« « Spikelets 2 -3-flowered, only the lowest flower perfect. 



17. GYMNOPOGON. Spikelets linear, scattered. Lower palea and rudiment awned. Spikes 



racemed. 



18. EUSTACIIYS. Spikelets roundish, crowded. Lower palea mucronnte. Spikes digitate. 



19. CYXODOX. Lower palea awnless. Culms creeping. Spike-s digitiitc. 



« * » Spikelets 4"5-flowered, one of the middle ones only perfect. 



20. CrENlUM. Lower palea stout-awncd on the back. Spike soliUiry. 



» * » * Spikelets mostly several-flowered, the lower flowers perfect. 



21. DACTYLOCTENIUM. Spikes diL'it.Mte. Upper glume awned. Palea) pointed. 



22. ELEUSINE. Spikes digitate. Glumes and palcjo awnless. 



23. LEPTOCIII.OA. Spikes racemed, long and slender. Glumes awnle.ss. 



TaiDE IV. FESTUCACEVE. — Spikelets panicled, few -many flowered : the upper Hnd 

 (in No. 3'! and .37) thw lower flowers also imperfect. Glumes 2. Palc.i> 2, membraiiaroous 

 or rarely indurated, awnless, or the lower one with a straight awn ut or near the apex. 

 Stamens 1-3 



» Grain smooth, free from the palc.T. Lower flowers perfect. 

 *- Lower palea 3 - 5-toothed or awned. 



24. TRICUSPIS. Spikelets 5 - 7 flowered. Lower palea slightly 2-ilirt. tlie ,T hairy norvM 



percurrcnt. 

 2.0. TUII'L.^SIS. Spikelet.s a-flowered, tUo iont-r (m.eu deeply 2 cleft, and with a plumOM 

 awn between the teeth. 



