GRAMINE^. (grass FAMILY.) 545 



|C buUata, PJll.) — Pine-barren swamps, Florida, and northward. — Culms 

 lio_20 liigh. Leaves narrowly linear, keeled, rather rigid. Perigynia occa- 

 lionally nearly smooth. 



= =: Perujyma smooth. 



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

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

 perigynia ovate-oblong, obscurely nei-ved, 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-pcduncled ; fertile spikes 

 1 - 2, oblong or oval ( 1 ' long), sessile, or on very short exserted 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. GRAMINE^. (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 {lif/ula) at the base of the blade. Flowers in spiked or 

 panicled spikelets, 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. 



Synopsis. 



Tribe I. OR VZE^E. — Spikelets 1 flowered, mostly imperfect. Glumes none. Pale8e2. 



Stamens 1-11. 

 1 LEERSIA. Flowers perfect, compressed, panicled. Palese unequal, ciliate. 



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



59. LUZIOLA. Flowers monoecious ; the pistillate and staminate ones in separate panicles 



3. HYDROCHLOA. Flowers monoecious ; the pistillate and staminate ones in separate spikes, 



60. MONANTHOCHLOE Flowers dioecious, in terminal spikes. 



Tribe IT. A GROSTIDE^E. — Spikelets 1-flowered, or with the pedicel of a second 

 flower above. Glumes 2. Palese 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. 

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



46* 



