- $46 GRAMINEZ. (GRASS FAMILY.) 
æ * Glumes distinct, concave or keeled. Pales membranaceous, Grain free. Spikelets in 
open or contracted panicles. 
5. SPOROBOLUS. Flowers awnless. Seed loose in the globose or obovoid pericarp. d 
6. VILFA. Flowers awnless. Seed adhering to the closely investing pericarp. 
7. AGROSTIS. Pales shorter than the nearly equal glumes, the lower awned on the back, 
the upper sometimes wanting. 
POLYPOGON. Pales much shorter than the long-awned glumes, the lower one truncated 
and toothed. Stamens 3. Panicle spike-like. 
9. CINNA. Pales 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 ohe. Palez bearded at the 
base, the Jower one mucronate or awn-pointed. Stamens 3. : 
11. BRACHYELYTRUM. Lower glume obsolete. Lower palea long-awned. A pedicel of a 
second flower at the back of the upper pales. Stamens Z. 
12. CALAMAGROSTIS. Palez surrounded with a tuft of long hairs, the lower awned on the 
back. 
> * + Palez raised 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. STREPTACHNE. Lower palea with a T straight or curved awn contintous with its 
apex. Panicle elongated. 
15. ARISTIDA. Lower palea triple-awned. Panicle elongated. 
eo 
Tre II. CHLORIDE. — Spikelets 2- several-flowered (in No. 16 one-flowered), in 
l-sided spikes. Rachis jointless. Upper flowers imperfect. Glumes and pales 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. GYMNOPOGON. Spikelets linear, scattered. Lower palea and rudiment awned. Spikes 
racemed. i 
18. EUSTACHYS. Spikelets roundish, crowded. Lower palea mucronate. Spikes digitate. 
19. CYNODON. 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. 
* * * x Spikelets mostly several-flowered, the lower flowers perfect- 
21. DACTYLOCTENIUM. Spikes digitate. Upper glume awned. Pales pointed. 
22. ELEUSINE. Spikes digitate. Glumes and pales awnless. 
23. LEPTOCHLOA. Spikes racemed, long and slender. Glumes awnless. 
Teme IV. FESTUCACEJE. — Spikelets panicled, few -many-flowered ; tho upper and. 
- (in No. 36 and 37) the lower flowers also imperfect. Glumes 2. Pales 2, membranaceous 
~ Or rarely indurated, awnless, or the lower one with a straight awn st or nest O4 SPS s 
Ms mrt 
.. * Grain smooth, free from the paleg. Lower flowers perfect. 
