TRIANDRIA. MONOGTNIA. SI 



lix, 3-celled; only one of the cells usually fer- 

 tile. 



Flowers in fastlglate panicles. 

 Species. 1. F radiata. 



31. PHYLLACTIS. Ptrsoon. 



Flowers involucrate; involucrum of t-leaf, 

 sheathing. C«/ix consisting of a minute margin. 

 Corolla trifid. Seed I. (Style and stamina ex- 

 serted.) 



Stemless or cespitose plants with fusiform roots, entire 

 leaves stellately disposed, and producing- almost sessile 

 flowers collected together in involucrate umbells. 



Species. 1, P?. *Qbovata. Stemless, root fusiform; 

 leaves radiating, linear-spathulate, obtuse, hirsutely-pi- 

 lose. (Flowers not seen; time of appearing-, October?). 



Habitat. On bare hills around the Arikaree village, 

 on the banks of the Missouri. (I give this with hesitatioH, 

 not having seen a perfect flower, merely a flower bud.)— 

 There are 3 other species of this genus in Peru. 



ff Flowers superior, incomjdete. 



32. TRIPTERELLA. Michaux. V^gelia. 

 Gmelin? 



Calix tubular and prismatic, with alated 

 martj^ins, and a venticose base; ^imft 6-cleft, the 

 alternating segments or teeth internal, minute 

 and horizontal, covering tlie stamina. Corolla 

 0. *SYi^??ias 3, capitate. Capsule 3-sided, 3-celled, 

 many-seeded. Stamina included within tlie 

 tube. 



Minute plants with simple stems, almost destitute of 

 distinct leaves. Flowers in short bifid cymose spikes, 

 distinct or crowded like a capitulum 



Species. 1. T- capitata. Stem setaceous; leaves remote, 

 amplexicaule, and subulate; flowers disposed in a crowd- 

 ed bifid cyme, as if capitulate, each flower furnished 

 with a lanceolate acute bracte, angles of the calix without 

 margins. 



On the borders of sandy ponds in Carolina. (Also in 

 Cayenne ) Flowers from May to July. The segments 

 of the tube yellowish, the rest of the ilower whitish. O? 



