28 POALES 



Flowering scales acute, pointed or usually awned 

 at the apex. 2. Festuca. 



Flowering scales obtuse or hyaline at the apex. 

 Scales obscurely 5 nerved, styles none. 



3. Puccinella. 

 Scales distinctly 7 nerved, styles present. 



4. Panicularia. 

 Flowering scales with tufts of hair at the base. 



5. Scolochloa. 

 Flowering scales more or less keeled. 6. Poa, 



Spikelets collected in dense one-sided clusters. 7. Dactyl is. 

 Flowers dioecious, spikelets almost sessile. 8. Distichlis. 

 Upper scales of the spikelet empty, broad and enclosing each 

 others. 10. Mellca. 



Flowering scales 1-3 nerved, or sometimes with a faint intermed- 

 iate nerves. 

 Lateral nerves of the flowering scales glabrous. 

 Callus of the flowering scales glabrous. 

 Flowering scales leathery, seeds exserted. 9. Korycarpus. 

 Flowering scale membranous, seeds not exserted. 



Plants growing in water or very wet soil. .11. Catabrosia. 

 Plants growing in dry or moist soil. 



Inflorescence a contracted or spike-like panicle. 



Second empty scale narrow, acute. 12. Koeleria. 



Second empty scale broad, rounded or obtuse at the 



apex. 13..Eatonia. 



Inflorescence an open panicle. 14. Eragrostis. 



Callus of the flowering scales pubescent with long hairs. 



16. Redfieldia. 

 Lateral nerves of the flowering scales hairy. 



Spikelets sessile or nearly so on the primary branches of the 

 inflorescence. 15. Diplanche. 



Spikelets on pedicels on the primary branches of the inflor- 

 escence. 

 Flowering scales with short teeth, the midrib excurrent as 

 a short point. 17. Tricuspis. 



Flowering scale deeply 2-toothed, awned, awn longer than 

 the teeth. 18. Triplasis. 



Rachilla hairy, hairs longer than the flowering scales. 



19. Phragmites. 



Styles long, protruding at the end of the scales; stigmas not plumose; 



spikelets clustered in the axil&. 20. IVIunroa. 



1. Bromus. 148. 



Flowering scales with compressed keels. 1. B. breviarlstatus. 



Flowering scales rounded on the back, at least below. 

 Second em.pty scale 5-7 nerved, the first 3 nerved. 

 Flowering scales nearly as wide as long. 2. B. brizaeformls. 



Flowering scales much longer than wide. 

 Flowering scales glabrous or nearly so. 

 Awn straight. 



Sheath glabrous. 3, B. secalinus. 



Sheath pubescent. 4. B. racemosus. 



