gkaminejE. (guass family.) 545 



(T. biiUata, h'tl.) — Pine-barren swamps, Florida, and northward. — Culms 

 l^°-2° high. Leaves narrowly linear, keeled, rather rigid. Perigynia occa- 

 lionally nearly smooth. 



= ^ Pmgyma smooth. 



73. C. riparia, Curtis. Sterile spikes 4-6, dark brown; fertile spikes 2 - 

 3, oblong cylindrical, sterile at the summit (I ^'-2' long), on erect peduncles, 

 perigynia ovate-oblong, obscurely nerved, tapering into a smooth 2-cleft beak, 

 longer than the oblong brown awned scale. — Deep marshes, Florida to South 

 Carolina, ^ Culms stout, 2°-3° high, rough above, shorter than the broad (|') 

 smoothish and glaucous leaves and bracts. 



74. C. buUata, Schk. Sterile spikes 2-3, long-ped uncled; fertile spikes 

 1 -2, oblong or oval (1' long), sessile, or on very short cxserted peduncles; peri- 

 gynia globose-ovate, much inflated, strongly nerved, smooth and shining, slender- 

 beaked, longer than the oblong acute scale. — Swamps, South Carolina, and 

 northward. — Culms 1° - 1^° high, shorter than the linear leaves and bracts. 



Order 160. GRAMliVEiE. (Grass Family.) 



Chiefly herbs. Stem (culm) mostly hollow and with closed joints. 

 Leaves alternate, 2-ranked, narrow and entire. Sheaths open or split 

 on one side, and usually prolonged into a membranaceous or fringed 

 appendage (ligula) at the base of the blade. Flowers in spiked or 

 panieled spilcelets, consisting of 2-ranked imbricated bracts or scales; 

 of which the exterior or lower ones, subtending one or more flowers, 

 are called glumes, and the two inner ones, enclosing the 1-celled 1-ovuled 

 ovary, and 1-11 (commonly 3) hypogynous stamens, are called palece. 

 Perianth none, or composed of 1 - 3 minute hypogynous scales (squamu- 

 Ice). Anthers versatile, 2-celled. Styles 2-3, with hairy or plumose, 

 stigmas. Fruit a caryopsis (grain). Embryo placed on the outside and 

 near the base of mealy albumen. — Root fibrous. 



Synopsisi 



Tribe I. ORYZE.aB. — Spikelets 1 flowered, mostly imperfect. Glumes none. Paleae2. 

 Stamens 1-11. 



1 LEERSIA. Flowers perfect, compressed, panieled. Paleae unequal, ciliate. 



2. ZIZANIA. Flowers monoecious ; the pistillate and staminate ones in the same panicle. 



59. LUZIOI.A. Flowers monoecious ; the pistillate and staminate ones in Feparate panicles 



3. HYDUOCHLO.A. Flowers monoecious ; the pistillate and staminate ones in separate spiites. 



60. MONANTHOCHLOB Flowers dicecjous, in terminal spikes. 



TanjE 11. AGROSTIDEjE.— Spikelets 1-flowered, or with the pedicel of a second 

 flower above. Glumes 2. Paleae mostly 2, the lower one often awned. Stamens 1-3. 

 Spikelets in open or closely spiked panicles. 



. * Glumes united at the base, strongly compressed-keeled. 



4. ALOPECTJRUS. Lower palea awned on the back, the upper wanting. Flowers spiked. 



46* 



