510 GKAMINK.K, (gUASS lAMILV.) 



t • Glumes dl.»tinot, conciivo or kcclpil. Pnlnse mcmhmnnrpous. Ornln free. Spikeli-U In 

 opuu or coDtracteii paDiclutt- 



6. SPOKOBOLUS. Flowers awnless. Seed loasc in the globose or obovoid |iericarp. 



6. TILFA. Flowers awnless. Seed adherio); to the closely investing pericarp. 



7. AOUOSTl.S. I'aleiu shorter than the nearly equal glumes, the lower uwned oil the bark, 



the upper sometimes wanting. 



8. I'OLYPOGON. Palcte much 8hort<"r than the long-awncd glumes, the lower one truncated 



and toothed. Stamens 3. Panicle spike-like. 



9. OINNA. PaleoB rather longer than the acute glumes, the lower one awned under the apex. 



Stamen 1. Panicle loose. 



10. MUHLENBERGIA Lower glume smaller than the upper one. Paloco bearded at the 



ba.se. the lower one muoronato or awn pointed. Stamens 3. 



11. BKACIIYEIiYTRUM. Lower glume obsolete Lower palea lor.g-awncd. A pedicel of a 



second tlower at the back of the upper palea?. Stamens '2. 



12. CAL.\MAGKOSTIS. Paleoe surrounded with a tuft of long hairs, the lower awued on the 



back. 



» * • Palete rai.scd 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. STKEPTACIINE. Lower palea with a single straight or curved awn continuous with its 



apex. Panicle elongated. 



15. AKISTIDA. Lower palea triple-awned. Panicle elongated. 



TninE ITT. CHCORIDE^E. — Spikelets 2 -several-flowered (in No. 16 one-flowered), in 

 1-sided spikes. Kachis jointless. Upper tlowers imperfect- Glumes and paleuc 2. Spikes 

 racemed or digitate, rarely single. 



* Spikelets strictly 1 flowered. (See Paspalum.) 



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



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



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



raoenied. 



18. EUSTACUYS. Spikelets roundi.sh, crowded. Lower palea mncronate. Spikes digitate. 



19. CY'NODON. Lower palea awnless. Culms creeping. Spikes digitate. 



* * • Spikelets 4 -• 5-flowered, one of the middle ones only perfect. 



20. CTENIUM. Lower palea stout-awned on the back. Spike solitary. 



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



21. DACTYLOCTENIUM. Spikes digitate. Upper glume awned. Palese pointed. 



22. ELEUSINE. Spike.s digitate. Glumes and paleoD awnless. 



23. LEPTOCIILOA. Spikes racemed, long and slender. Glumes awnless. 



Tride IV. FESTUCACEjE. — Spikelets panicled, few -many flowered : thouppernnd 

 (in No. .30 and 37) the lower flowers also imperfect. Glumes 2. Palea; 2, membranaceous 

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

 Stamens 1-3 



• Grain smooth, free from tlie palefc. Lower flowers perfect. 

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



24. TIITCUSPIS. Spikelets 5-7 tlowered. Lower palea slightly 2-cleft, the 3 hairy nerves 



percurrent. 



25. TRTPLASIS. Spikelets 3-flowered, the lower pa.ea deeply 2-cleff, and with a plumose 



awn between the teeth. 



