38 Order POALES 
Flowers dicecious, spikelets almost sessile. 8. Distichlis. 
Upper scales of the spikelet empty, broad and enclosing each 
others. 10. Melica 
Flowering scales 1-3 nerved, or sometimes with faint intermedi- 
ate nerves. 
Lateral nerves of the flowering scales glabrous. 
Flowering scales without long hairs at the base. 
Growing in water or wet soil; flowering scales erose- 
truncate. 11. Catabrosa. 
Growing in wet or dry soil, not aquatic. 
Flowering scales leathery; seed exserted; growing in 
woods. 9. Korycarpus. 
Flowering scales not leathery; seed not exserted. 
Inflorescence a contracted spike-like panicle. 
Second empty scale narrow, acute. 12. Koeleria. 
Second empty scale broad, rounded or obtuse at the 
apex, broader than the flowering scales. 
13. Sphenopholis. 
Inflorescence an open panicle. 14. Eragrostis. 
Flowering scales with long hairs at the base. 16. Redfieldia. 
Lateral nerves of the flowering scales hairy. 
Spikelets sessile or nearly so on the primary branches of 
the inflorescence. 15. Diplachne. 
Spikelets on pedicels on the primary branches of the in- 
florescence. 
Flowering scales with short teeth, the midrib excurrent 
as a short point. 17. Tridens. 
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, spikelets in the 
axils of clustered leaves; a low xerophytic grass. 20. Munroa. 
1. Bromus. 148. 
Flowering scales with compressed keels. 1. B. breviaristatus. 
Flowering scales rounded on the back, at least below. 
Second empty scale 5—7-nerved, the first 3-nerved. 
Flowering scales nearly as wide as long. 2. B. brizeformis. 
Flowering scales much longer than wide. 
Flowering scales glabrous or nearly so. 
Awn straight. 
Sheath glabrous. 3. B. secalinus. 
Sheath pubescent. 4. B. racemosus. 
Awns bent at the base. 5. B. squarrosus. 
Flowering scales pubescent. 
Awns 2-3 mm. long. 6. B. kalmii. 
Awns 10 mm. long. 7. B. hordeaceus. 
Second empty scale 3-nerved. 
First empty scale 3-nerved. 8. B. porteri 
First empty scale 1-nerved. 
Awns shorter than the flowering scales. 
Inflorescence drooping, scales awned. 5. B. eihatus, 
