POACEAE. 19 



Flowering scales entire or acutely 2-toothe(l at the apex, usually awned or awn- 

 tipped. 1. D. fascicularis. 

 Flowering scales with 2 broad rounded teeth, usually awnless. 2. D. dubia. 



1. D. fascicularis (Lam.) Beauv. Stems 3-8 dm. tall: leaf-blades 1-2 dm. 

 long, 3 mm. wide or less: inflorescence usually partially included at the base, 

 its 8 or more racemes erect or erect-ascending, the larger ones 4-8 cm. long: 

 scales 10-12, the flowering scales 3-4 mm. long, the nerves pilose below the 

 middle. — Hammocks and cultivated grounds, L. keys. — (Bah., Cuba, Ant.) 



2. D. dubia (H.B.K.) Benth. Stems 3-10 dm. tall: leaf -blades 2-8 mm. wide: 

 inflorescence usually finally exserted, 1-2 dm. long, the 5-20 racemes erect to 

 spreading: spikelets 5-9 mm. long: scales 5-10, the flowering scales about 

 4.5 mm. long, oblong, the lateral nerves vanishing considerably below the apex 

 of the lobes, the midnerve at the cleft or rarely extending into a short awn, the 

 margin of the scale ijilose below the middle. — Hammocks and cultivated 

 grounds, U. keys, L. keys. 



33. ERAGEOSTIS Beauv. Erect or diffuse plants, the stems sometimes 

 prostrate or creeping, with open or contracted panicles. Spikelets numerous, 

 arranged singly or in fascicles, 2-many-flowered, the flowers perfect or uni- 

 sexual. Scales 4-many, membranous, compressed, keeled, the flowering scales 

 3-nerved, obtuse or acute at the apex: palet often incurved and persistent on 

 the rachilla after the fall of the scale. 



Palet of the spikelets glabrous on the keels or merely hispidulous : plants perennial. 



1. E.ElliottU. 

 Palet of the spikelets conspicuously and beautifully ciliate : plants 

 annual. 

 Panicle contracted, spike-like, the branches short and appressed. 2. E. ciliaris. 

 Panicle open, its branches spreading. 3. E. plumosa. 



1. E. Elliottii S. Wats. Stems firm, 4-10 dm. tall: leaf -blades 4 dm. long or 

 less, 3-5 mm. wide : panicle diffuse, 2-5 dm. long, its long slender branches 

 finally widely spreading or ascending; spikelets 6-13-flowered, 5-10 mm. long, 

 the flowering scales 1.75-2 mm. long. — Pinelands, L. keys. — [E. K.] — (Bah., 

 Cuba, Ant.) 



2. E. ciliaris (L.) Link. Stems 1.5-4 dm. tall: leaf -sheaths usually ciliate on 

 the margin and with a tuft of long hairs at the apex ; blades 2-8 cm. long : panicle 

 often interrupted ■ below, 3-10 cm. long: spikelets 6-16-flowered, the hairs of 

 the palet exceeding 0.5 mm. long. — Hammocks and cultivated grounds, U. keys, 

 L. keys. — [E. K.] — (Ber., Bah., Cuba, Ant.) 



3. E. plumosa Link. Stems 1-4 dm. tall: leaf -sheaths usually ciliate on the 

 margin and with a tuft of hairs at the apex; blades 2-10 cm. long: panicle 

 oblong, 4-16 cm. long: spikelets 4-8'-flowered, the nerves of the palet ciliate 

 with hairs about 0.2 mm. long. — Hammocks and cultivated grounds, U. keys, 

 L. keys.— [E. K.]—(Bah., Cuba.) 



34. UNIOLA L. Erect or reclining plants with contracted or open 

 panicles. Spikelets laterally compressed, 2-edged, 3-many-flowered. Scales 

 6-many, compressed-keeled, sometimes winged, the flowering scales many- 

 nerved. 



1. U. paniculata L. Stems 1-2.5 m. tall: leaf -blades 3 dm. long or more: 

 panicle 2-3 dm. long or more: spikelets many-flowered, ovate to oval, 12-25 

 mm. long, the flowering scales 8-10 mm. long. — Coastal sand-dunes, U. S. keys, 

 U. keys, L. keys, L. S. keys. — [E. K] — (Bah., Cuba.) — Sea-oats. 



35. DISTICHLIS Eaf. Tufted, dioecious plants with rigid creeping or 

 decumbent stems concealed by the overlapping sheaths, and contracted panicles. 



