383 TKIAKDRIA MOKOGYNrA. I'aUga, 



nearly as long as the ciiim. — Spikes terminal, generaMy three, sessile, 

 oval, imbricated with innumerable small rust-coluured tlowers. — 

 Involucre two-ieaved, the largest is often erect, and looks like a con- 

 tinuation of the culm, it is from two to three inches long ; besides 

 these there are two or more oval, lateral, scales. — Calyx, a scale, 

 single, nearly as in the .scirpi, one-liowered, wedge-shaped, striated. 

 — Cm-ul two-valved, membranaceous, shorter than the sci'e. — 67a- 

 rneiii: three. — Slig/na three-clel't. — Seed oblong, ihiee-jided, with- 

 out bristles. _ 



2. T. Uvkata. R. 



Culms from one to two feet high, three-sided. Spikes several, 

 terminal. Involucre three-leaved. 



A native of moist vallies. 



Moot fibrous. Culms erect, from one to two feet high, nearly 

 naked, three-sided, smooth. — Leares numerous, sheathing, half as 

 long as the culm — Head terminal, generally composed of about se- 

 ven oval, sessile, closely imbricated spikes. — Involucre tuo or three- 

 leaved, very unequal, the largest fromiive to eight inches, the short- 

 est one, or one and a half. — Calyx a^ in T. triceps, only sometimes 

 three-lobed at the apex. — The rest as iu T. triceps. 



3. T. diandraJiR. 



Culms leafy, two or more feet high, three-sided ; corijmhs termi- 

 nal ; involucres alternate. Floiceis diandrous. Style two-cleft. 



A stout, erect, smooth, long-leaved species; a native of Amboyna. 



Culm jointed, thjee.sided, smootii. — Leaves one at each joint, 

 sheathing, rising much higher than the culm, linear, smooth, acute, 

 three-nerved, about three feet long, — Corymbs terminal, decom- 

 pound or more. — Involucres several, the largest at the first 

 division of the corymbs, and like the leaves of the culm, but 

 smaller; spikelefs oval, minute, composed of many small brown 

 imbricated flowers as iu the scirpi. — Calyx, a glume, roundish, 

 smooth, — Corol ; the two valves, small, placed transversely with 



