V 



Cyperus. triandiiia monogynia. 203 



slender leaves, and scanty involucre, immediately distinguish 11 frc in 

 all the other Lidian sptcies I have )t;t met v^iih. 



26. C. iuberosiis Linn. Sp. PL ed. Jl Hid. I. 2Sl. Rottb. gram. 

 28. t. 7-/. 1- f''ah/. Lnua.. JtL £. J40. 



Hoot tuberous. Leaves iineai-, length of the culms. Umbels com- 

 pound, or decompound. Livolucre three-leaved, longer than the um- 

 bel. S'/j/Ze ihree-cleft. i'^tJii oblong, three-sided. 



This seems to me to be only a luxuriant variety, if so much, of 

 C. rotundas. It grows in the same places, the roots are tuberous, 

 &c. in short, I can scarcely perceive any difference. 



27. C. temdforus. Uiin.Sp. PI. ed. JVilld. 1. 284. Rot th. gram. 

 SO. t. 14./. 1. Vahl. Enum. PL 2. 374. 



Culm from two to lour feet high, sharp angled. Involucre three or 

 four-leaved, much longer than the decompound umbel. Spikeleta 

 alternate. ^Vc/t's obtuse; setc/s obcordate, three-sided. 



Telins:. Gelleba-tjmga. 



Grows in standing sweet water. 



Root creeping, with ramous tibres. — Calm erect, from four to six 

 feet high, naked, three-sided, smooth ; a^g/es sharp.— Lsaies most- 

 ly radical, shorter tlian the culm, deeply channelled, smooth.— 

 Umbel terminal, decompound, from four to eight inches each way. 

 —All the nmbellets peduncled, oblong, spreading, composed of 

 alternate, sessile, lanceolate, from twenty to thirty-liowered spikes. 

 ^Involucre three or four-leaved, very unequal, the largest being 

 from one to two feet long, and the shortest about one or two in- 

 ches. — Siafes obtuse, apex often emarginatc and uiembrauaceous. 

 — Seeds ihree-sided; obovaie. 



28. C. strictus. R. 



Culms about tweKe iuHies high, stiff and straight, shorter than the 

 leaves; cng/es shar,). UjihA decompound, straight, Jiowers dian- 

 drous. 6ee s obovatt^, compressed, without angles. 



Delights iu a moist uiicuilivated soil. 



