POACEAE. 15 



from the involucre. Hammocks, U. keys, L. keys, L. S. keys. (Ber., Bah., 

 Cuba, Ant.) 



3. C. viridis Spreng. Similar to C. eckinatus in habit, but brighter-green: 

 spikes mostly 3-10 cm. long: involucres crowded, with slender basal spines, the 

 bristles very slender. Hammocks, U. keys. (Bah., Cuba, Ant.) 



4. C. incertus M. A. Curtis. Stems 3-6 dm. tall: blades 4-15 cm. long, 3-5 

 mm. wide: spikes 3-6 cm. long: involucres 8-20, containing 2 spikelets, pubes- 

 cent, ovoid, glabrous at the base, the spines about 3 mm. long, very broad at 

 the base, ciliate: spikelets 5 mm. long, exserted from the involucre. Open 

 sandy places, L. S. keys. 



16. STENOTAPHRUM Trin. Creeping, much-branched plants, with ter- 

 minal spikes or spike-like panicles. Spikelets 2- (rarely 1-) flowered, in 2's-4's 

 in short spikes. Scales 4. 



1. S. secundatum (Walt.) Kuntze. Stems compressed: leaf -blades rounded at 

 the apex, usually less than 1 dm. long, 4-10 mm. wide: spikelets 3.5-5 mm. 

 long. Coastal sand-dunes, U. S. keys, U. keys, L. keys. [E. K.] (Ber., BaJi., 

 Cuba, Ant.) SHORE-GRASS. 



17. HOMALOCENCHRUS Mieg. Grasses of wet situations. Spikelets 

 1-flowered. Scales 2, somewhat rigid, awnless, the first scale usually ciliate on 

 the keel, broader than the second. Stamens 1-6. 



1. H. monandrus (Sw.) Kuntze. Stems 4-6 dm. tall: leaf -blades erect, 4-15 

 cm. long, 2-5 mm. wide, roughish : panicle 7-13 cm. long : spikelets about 1 mm. 

 broad, smooth and glabrous. Low hammocks and limesinks, U. keys, L. keys. 

 (Cuba, Ant.) 



18. ARISTIDA L. Tufted plants with contracted or open panicles, which 

 are sometimes nearly racemose. Spikelets narrow. Scales 3, the outer 2 mem- 

 branous, the third scale narrow, rigid, strongly convolute, often with a promi- 

 nent callus at the base, the generally spreading awns glabrous to plumose. 



1. A. purpurascens Poir. Stems 3-8 dm. tall: leaf -blades 5-20 cm. long: 

 panicle 1.5-3 dm. long: spikelets 9-12 mm. long, the flowering scale 6-8 mm. 

 long, the awns more or less spreading, especially the central one which is 1.5- 

 2.5 cm. long, the lateral awns from two-thirds as long to nearly equalling it. 

 Pinelands, L. keys. [E. K.] (Bah.) POVERTY-GRASS. WIRE-GRASS. 



19. MUHLENBERGIA Schreb. Tufted or diffuse plants with terminal 

 contracted or open panicles. Spikelets small. Scales 3 (or rarely 4), the outer 

 2 persistent, membranous or hyaline, from minute to almost equalling the third 

 scale, keeled, acute, mucronate or rarely short-awned, the second occasionally 

 3-toothed, the third scale somewhat rigid, convolute at the apex, entire or 

 rarely 2-toothed, obtuse, acute, mucronate to long-awned, the awn very often 

 capillary, a fourth awned scale very rarely present. 



1. M. capillaris (Lam.) Trin. Stems wiry, 5-12 dm. tall: leaf -blades long and 

 narrow, often involute when dry, 1-3 mm. wide: panicle 1.5-4 dm. long, its 

 branches spreading or ascending: spikelets, exclusive of the awn, 3.5-4 mm. 

 long, lanceolate, acuminate, the empty scales usually one-half as long as the 

 spikelet or less, commonly bearing a short awn. Pinelands and coastal sand- 

 dunes, U. S. keys, L. keys. [E. K.] (Bah., Cuba.) 



20. SPOROBOLUS E. Br. Erect or diffuse plants with terminal panicles, 

 which are contracted or open and diffuse. Spikelets small. Scales 3, mem- 



