TRIANDRIA. MONOGTXIA. 21 



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

 tile. 



Flowers in fastlg-iate panicles. 

 SvEciES. 1. F. radiata. 



31. PHYLLACTIS. rersoon. 



Flowers involucrate; involucrum of I -leaf, 

 sheathing. Ca/ia: consisting of a minute margin. 

 Corolla trifid. Seed 1. (Style and stamina ex- 

 serted.) 



Stemlessorcespitose plants with fusiform roots, entire 

 leaves stellately disposed, and producing- almost sessile 

 flowers collected together in involucrate umbells. 



Species. 1. PP. *obovata. 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 hesitation, 

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

 There are 3 other species of this genus in Peru. 



If Flowers superior, incomplete. 



32. TRIPTERELLA. Michaiix. V^gelia. 

 GmelinP 



Calix tubular and prismatic, with alated 

 margins, and a venticose base; /im6 6-cleft, the 

 alternating segments or teeth internal, minute 

 and horizontal, covering the stamina. Corolla 

 0. 'S'^)?! as 3, cap it ate. Capsule 3-sided, 3-celled, 

 man}' -seeded. Stamina included within the 

 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 capitulatCt 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 Ihe tube yellowish, the rest of the flower whitish. O \ 



