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188 TRIANDRIA MOXOGYNIA. Tunga 
nearly as long as the culm.—Spikes terminal, generally three, sessile, 
oval, imbricated with innumerable small rust-coloured flowers.— 
Involucre twó-leaved, the largest is often erect, and looks like a cone 
tinuation of the culm, it is from two to three inches long ; besides 
these there are two or more oval, lateral, scales.—Calyz, a scale, 
single, nearly as in the seirpi, one-flowered, wedge-shaped, striated. 
—Corol two-valved, membranaceous, shorter than the scale.—Sta- 
mens three.— Stigma three-cleft.—Seed oblong, three-sided, with- 
-out bristles. 
2. T. laevigata. R. ; 
‘Culms from one to two feet high, three-sided. Spikes several, 
terminal. Jnvolucre three-leaved. a 
A native of moist vallies. | | 
Root fibrous. Culms erect, from one to two feet high, nearly 
naked, three-sided, smooth.— Leaves numerous, sheathing, half as 
long as the culm.— Head terminal, generally composed of about se- 
ven oval, sessile, closely imbricated spikes.— Involucre two or three- 
leaved, very unequal, the largest from five to eight inches, the short- 
est one, or one and a half.—Calyz as in T. triceps, only sometimes 
three-lobed at the apex.— The rest as in T. triceps. | 
3. 'T. diandra. R. Bi 
à Culms leafy, two or more feet high, three-sided ; corymbs termi- 
nal; involucres alternate. Flowers diandrous. Style two-cleft. 
"A stout, erect, smooth, long-leaved species; a native of Amboyna.’ 
Culm jointed, three-sided, smooth.— Leaves one at each joint, 
sheathing, rising much higher than the culm, linear, smooth, acute, 
three-nerved, about three feet long.—Corymbs terminal, decom- 
poutid or more.— luvolucres several, the largest at the first 
division of the corymbs, and like the leaves of the culm, but. 
smaller; spikelets oval, minute, composed. of many small brown 
* 
imbricated flowers as in the scirpi.—Calyz, a glume, roundish, 
w 
sinooth.—Corol ; the two valves, small, placed transversely with 
