HITCHCOCK AND CHASE—GRASSES OF THE WEST INDIES. 271 
11. FESTUCEAE, 
Lemmas cleft at the summit into numerous awns; panicle contracted, elongate. 
88. Pappophorum (p. 385). 
Lemmas with a single awn or awnless. 
Spikelets (at least the pistillate) with copious long silky hairs on the 
lemmas or the rachilla; tall reeds with large plumy panicles. 
Spikelets unisexual; pistillate spikelets hairy, the staminate glabrous; 
plants dicecious__________-____-_-______ 90. Gynerium (p. 385). 
Spikelets perfect. 
Lemmas hairy; rachilla glabrous___.-_______ 91. Arundo (p. 386). 
Lemmas glabrous; rachilla hairy________ 92. Phragmites (p. 486), 
Spikelets not long-hairy, the hairs if present much shorter than the lemma. 
Glumes leaflike; spikelets concealed in the upper sheaths; plants 
dicecious _____-______ ----- 89. Monanthochloé (p. 385). 
Glumes not leaflike; spikelets exposed. 
Stigmas elongate, wiry, coiled, tendril-like; spikelets in a long 
1-sided raceme____. -------_. ~~ ~-___ 96. Streptogyne (p. 393). 
Stigmas not elongate nor wiry. 
Blades broad, ovate to elliptic, showing transverse veins between 
the nerves. 
Spikelets 3 to 5-flowered; glumes broad, truncate; panicles 
small - ------- 94, Senites (p. 392). 
Spikelets 1 or 2-flowered, the second floret commonly obsolete, 
the elongate rachilla only present; glumes acuminate; 
panicles large, diffuse__...._____ 95, Orthoclada (p. 393). 
Blades linear, no transverse veins showing. 
Spikelets in 1-sided dense clusters, these at the ends of the few 
stiff panicle branches____________ 100. Dactylis (p. 394). 
Spikelets not in 1-sided clusters. 
Lemmas 3 nerved________-_-_-_/_-_-- 93. Eragrostis (p. 387). 
Lemmas 5 or more nerved. 
Lowest 1 to 4 lemmas empty; spikelets firm, strongly com- 
pressed. 
Plants hermaphrodite, usually more than 50 ecm. tall. 
97. Uniola (p. 393). 
Plants dicecious, usually less than 30 cm. tall. 
98. Distichlis (p. 394). 
Lowest lemmas fertile. 
Florets horizontally spreading; lemmas cordate at base. 
99. Briza (p. 394). 
Florets ascending; lemmas not cordate, 
Lemmas awnless; spikelets small. 
Spikelets ovate or elliptic, few-flowered; lemmas 
keeled_ - -101. Poa (p. 395). 
Spikelets linear, many-flowered ; lemmas rounded on 
the back ____--_______ 103. Scleropoa (p. 396). 
Lemmas awned or mucronate (if awnless the spikelets 
large). 
Awn from the tip_-_-_______ 102. Festuca (p. 395). 
Awn from a bifid apex or wanting. 
104. Bromus (p. 396), 
47877° —17-2 
