372 
92. GRAMINE.E. 
8. Alopecurus. Glumes membranous, acute (in A. genicu- 
laius blunt). FI. 1. Pale I, scarious, 5-nerved, awned on 
the back, the margins usually connected below. “ Styles 
usually combined.” 
9. Knappia. Inflorescence a somewhat l-sided raceme. Glumes 
not keeled, blunt. FI. 1. Pale 1, scarious, very hairy, ob- 
tuse, not awned. 
Tr. IV. AGROSTIDE.^Itl. Spikelets and glumes as in Tr. III. 
Stigmas sessile or nearly so. Inflorescence panicled. — Glumes 
very unequal in Apera. 
10. Gastridium. Glumes membranous, acute, unarmed, 
ventricose at the base, much longer than the flower. FI. 1. 
Pales 2, membranous ; lower truncate or toothed at the end, 
with or without a dorsal awn. 
11. PoLYPOGON. Glumes scarious, nearly equal, each fur- 
nished with a long seta from just below the emarginate sum- 
mit. Pales shorter than the glumes, outer usually awned 
from below the summit. 
12. Milium. Glumes membranous, nearly equal, unarmed. 
Pales 2, nearly equal, unarmed, about as long as the glumes, 
hardening on the fruit. Spikelets convex on the back, or 
slightly dorsally compressed. 
13. Agrostis. GZwmes membranous acM^e, unarmed, the upper 
one smaller. Pales unequal, scarious, with or without a 
dorsal awn, shorter than the glumes. Seed free. — In A. 
canina the inner pale is wanting. 
14. Apera. Spikelets with the rudiment (pedicel) of a supe- 
rior floret. Lower and lesser glume 1 -nerved; upper and 
larger 3-nerved, about as long as the lower pale. Other- 
wise like Agrostis. 
[Tr. V. STIPACEAE. Spikelets in an equal panicle, 1 -flowered, 
without any rudiment. Outer pale convolute and hardened 
upon but not attached to the fruit, the extremity rolled up 
and jointed to a long avra.] 
[15. Stipa. Florets stalked. Pales coriacous, the inner 
entire. Awn evidently jointed to the pale, kneed and 
twisted.] 
Tr. VI. ARUNDINE./E. Spikelets laterally compressed, 1- 
flowered, or with a superior rudiment, or many-flowered. 
FI. enveloped in long (short in Psamma) silky hairs. Styles 
and stigmas various. “ Ai^ni, when present, not twisted.” 
1C. Arundo. Glumes nearly equal, i/ie /ottJer rather the Zow^er. 
