524 



CVII. GRAMINEiE. 



13. 

 14. 



17. 



18. 



15. 



*♦ 



15. 



26. 



31. 



16. 



33. 



18. 



17. 



27. 



Calamagrostis. Panicle loose. Floret surrounded with long silky 

 hairs. Glumellas membranaceous. 



Agrostis. Panicle loose. Floret glabrous, or with a small tuft of 

 hairs at the base. Glumellas membranaceous. Caryopsis free. 



§§ Glumes shorter than the floret^ unequal, 



MoLiNiA. Panicle somewhat contracted. Glumes acute, lower one 

 1-nei'ved. Glumellas at length cartilaginous and covering the 

 caryopsis. Neuter floret, when present, subulate. 



Melica. Panicle lax. Glumes rounded on the back, several -nerved, 

 Glumellas glabrous, awnless, at length cartilaginous and inclosing 

 the loose caryopsis. Neuter floret club-shaped. 



Catabrosa. Panicle spreading. Glumes obtuse, lower one 1-nerved. 

 Glumellas membranaceous. 



Spikelets 2 — B-flowered; perfect florets 2, or solitary with 1 — 2 harrm 

 (triandrous florets) or a neuter floret as large as the perfect one. 



■f Spikelets compressed laterally or somewhat rounded, 



r 



J Panicle laxy spreading or contracted, 

 § Fertile florets 2. Barren S-androus ones none, 



Catabkosa. Spikelets scarcely compressed, awnless. Glumes obtuse 

 shorter than the iflorets, unequal, 1-nerved. Glumellas 2, nearly, 

 equal, glabrous on the keel and the base, truncate and erose at 

 the summit. 



PoA. Spikelets compressed, awnless, -Glumes shorter than the 

 florets, 2-nerved. Glumellas 2, herbaceous, entire; outer one 

 keeled and hairy on the keel below the middle, scariose and blunt- 

 ish at the end (not acuminated). 



Festuca. Spikelets compressed, awnless on the back. Glumes 

 shorter than the florets, narrow and acute, lower 1-, upper obso- 

 letely 3-nerved. Glumellas 2, herbaceous; outer one rounded on 

 the back below, 3-ribbed, acuminate, not silky on the ribs. 



AiRA. Spikelets compressed. Glumes 2, unequal, lower 1-, upper 

 1 — 3-nerved, about as long as the florets. Glumellas hairy at the 

 base ; outer one awned at the back with or without faint lateral 

 nerves, toothed or entire or bifid, but not setigerous, at the end. 

 Caryopsis glabrous. 



AvENA. Spikelets compressed. Glumes 2, membranaceous, upper 

 one 3 — 7 nerved. Glumellas hairy at the base, at length carti- 

 laginous and firmly inclosingJthe caryopsis; outer one with a 



long twisted geniculate awn, with 2 points or bristles at the 

 summit. 



Melica. Spikelets rounded on the back, awnless. Glumes 2, mem- 

 branaceous, as long as the florets, nearly equal, 5-nerved. Outer 

 glumella rounded on the back, 7-nerved, entire, glabrous, at 



length cartilaginous, and inclosing the loose caryopsis. Neuter 

 floret club-shaped. 



MoLiNiA. Spikelets awnless. Glumes 2, membranaceous, acute, 



much shorter than the florets, unequal, 1-nerved. Outer glumella 



rounded on the back 3—5 nerved, entire, glabrous, at length 



cartilaginous and inclosing the loose caryopsis. Neuter floret 

 subulate. 



Triodia. Spikelets compressed, rounded on the back, awnless. 

 Glumes 2, as long as the florets, 3-nerved. Glumellas sub- 

 coriaceous, hairy at the base; outer one 3-toothed at the end. 



25. 



15. 



33. 



