Cyperus. triandria monogynia. 195 



Obs. The upper flowers of the spike are incomplete. 



18. C. castaneus. Linn. sp. pi. ed. W'dld. 1. 278. 



Culms from two to six inches high, length of the leaves. 

 Umbels generally compound ; length of the involucre. Scales 

 with long recurved points, monandrous. Seed rugose, ob- 

 tusely triangular. 



A most beautiful delicate, small species; delights in moist, 

 sandy, pasture land. 



Root fibrous. Culms erect, from two to six inches high, 

 naked, three-sided, smooth. Leaves sheathing, filiform, 

 scarcely so long as the culm. Umbel terminal, one or one 

 and a half inch, simple, or compound, but in general com- 

 posed of from one to five small peduncled umbellets, and 

 one or two sessile ones. Spikelets linear, many-flowered. 

 Scales three-keeled, with a recurved point, green keel and 

 chesnut-coloured sides. Stamen single, (at least I have not 

 found more.) Style two-cleft. Seed obtusely three-sided, 

 oblong, rugose. 



19. C. difformis. Linn. sp. pi. ed. Willd. 1. 280. Vahl. 

 enum. 2. 337. 



Culm from nine to eighteen inches high, angles sharp. 

 Umbels ; compound umbellets globular ; spikelets crowded. 

 Involucre from two to three-leaved. Scales imbricated. Seed 

 obovate, three-sided. 



Gramen cyperoides, &c. Pluck, aim. 192.y. 3. 



Beny. Behooa. 



Grows equally in either a dry, or wet sandy soil. 



Root fibrous. Culms two-thirds naked, erect, from nine 

 to eighteen inches high, three-sided, smooth, angles sharp. 

 Leaves sheathing, as long as the culm, keeled, smooth. Um- 

 bel compound, small, being only an inch and a half each 

 way. Umbellets from two to four, sub-sessile, and from two 

 to four longer or shorter peduncled, globular, composed of 

 innumerable, very small, oval spikes, Involucre from two to 



Ma 



