Monograph of North American RhynchosporcE. 195 
Ch^tospora, Humboldt, Bonplaiid, and Kunth, Synop. PI. 
^quinoc. Orb. Nov. I. p. 158. 
Ord. Nat. CYPERACEiE, R. Brown, Be Cand., Agardh, 
Bartling, etc. Cyperoide^, Juss. CalamarIjE, Lhin. In 
Syst. Sex. Triandria Monogynia. 
Culms mostly simple, triangular or subterete, leafy. Inflo- 
rescence corymbose, paniculate or fasciculate, rarely capitate. 
Corymbs one or several, terminal or lateral, mostly single, 
but sometimes 2 or 3 emerging from the same sheath. 
SpiJccleis ovate or lanceolate, few-flowered. 
Glumes (bractese, Lindl. ; bracteolae, Bartl.; squamae, R. 
Brown,) loosely imbricated on every side, one-nerved, cuspi- 
date ; the inferior ones shorter and empty. 
Perianthium,* {R. Brown, Bartling,) (prolongations of the 
torus, De Cand.f) composed of a definite number of hypogy- 
nous bristles. Bristles 5 — 12, but for the most part 6, in two 
series : the 3 outer ones opposite to, and the 3 inner ones al- 
ternate with, the stamens, plumose or denticulate-hispid ; the 
hispidness directed either upward or downward. 
Stamens 3 ; rarely 2, 6, or 12. Filaments broad and flat. 
Anthers linear, exserted. 
Style 1, bifid (rarely entire), dilated at the base. 
Nut {R. Brown) (seed, Liim.; caryopsis, Spreng.; akenium, 
Kunth,) crustaceous, ovate, obovate or rotund, lenticular or 
subglobose ; often attenuated at the base, crowned and sub- 
articulated with the indurated, persistent base of the style, or 
* " Perianthium nullum vel setosum, rariusve membranaceum 1 — 3 
valve." jR- Brown, Prodr. Fl. F. Holl. (in charac. famil. Cyperac.) 
I. p. 212. 
f " Le torus se prolonge quelquefois autour du fruit, ou sous forme 
d'ecailles petaloides distinctes, comme dans I'ancolie ; ou des filets pili- 
formes, comme dans plusieurs cyperacees." De Cand. Organogr. Veg. 
II. p. 89. 
