(JKAMINE.E. (GKASS FAMILY.) 545 



{V. bii'.lata, Jilt.) — Pine-barren swamps, Florida, and northward. — Culms 

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

 sionally nearly smooth. 



= = Periyijma smooth. 



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

 3, oblong cylindrical, sterile at the summit (H'-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 (.V) 

 smoothish and glaucous leaves and bracts. 



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

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

 gynia globose-ovate, much inflated, strongly nerved, smooth and siiining, 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. GRAMIi\E^. (Grass Family.) 



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

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

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

 appendage (Uc/ula) at the base of the blade. Flowers in sjjiked or 

 panicled spikelets, consisting of 2-ranked imbricated bracts or scales; 

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

 arc called fjlumes^ and the two inner ones, enclosing the 1-celled 1-ovuled 

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

 Perianth none, or composed of I - 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. 



Synopsis. 



Tribe I. OR YZE^:. — Spikelets 1 flowered, mostly imperfect. Glumes none. Pale»2. 

 Stamens 1 - 11. 

 1 LEEHSIA. Flowers perfect, compressed, panicled. Pale's unequal, ciliate. 



2. ZIZAXIA. Flowers monoecious : the pistillate and staniinate one.s in the same panicle. 



59. LUZIOIiA Flowers monoecious; the pistillate and staniinate ones in fcparate panicles 



3. IIYDHOrilLOA. Flowers monoecious ; the pistillate and staniinate ones in separate spikes. 



60. MOXANTIIOCHLOE Flowers dioecious, in terminal spikes. 



Tritie II. A GROSTIDEjE. — Spikelets 1-fiowered, or with the pedicel of a second 

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

 Spikelets in open or closely spiked panicles 



* Glumes united at the ba.'se, strongly compressed -keeled. 



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



46* 



