POACEAE. 19 



Flowering scales entire or acutely 2-toothed at the apex, usually awned or awn- 

 tipped. 1. D. fascicularis. 

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



7V 1. D. fascicularis (Lam.) Beauv. Steins 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. — {Bali., Cuba, Ant.) 



7ji 2. D. dubia (H.B.K.) Benth. Stems 3-10 dm. tall: leaf -blades 2-8 mm. mde: 

 inflorescence usually flnally 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 pilose below the middle. — Hammocks and cultivated 

 grounds, U. keys, L. keys. 



/ '- 33. ERAGROSTIS 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. Elliottii. 

 Palet of the spikelets conspicuously and beautifully ciliate : plants 

 annual. 

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

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



7*^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.) 



'7^ 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.]— (5er., Bah., Cuba, Ant.) 



7G; 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. 



771. 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. lone. — Coastal sand-dunes, U. S. keys, 

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



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

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



