CiRC^A. ONAGRACE^. 527 



Tribe II. CIRCiEEiE. DC. 



Flowers rofrular and symmetrical, with a binary arrangoment, 

 viz: Lobes of the calyx, petals, and stamens 2. Capsule 2 called, 

 2-vulved. Seed solitary in each cell, erect. — Leaves opposite, 

 petioled. 



Lopczia, with Pomoianclr.i and Diplandni, Hook. ^- Am., and porlinps Ilauya, 

 will doubtless form a distinct tribu. 



l-,>. CIKCyEA. Tmmu; Lam. ill. I. Id : Garln.fr. l. 24. 



Tube of the calyx slightly prodiircd hoyond llic ovary; the free portion 

 nearly filled whh a cup-shaped disk, deciduous; the limb 2-partcd. Petals 

 2, obcordate. Stamens 2, alternate with the petals : filaments filiform : an- 

 thers short. Style filiform : stigma somewhat capitate, emarginate. Cap- 

 sule obovate, 2-cellcd, at length 2-valved, with a single erect seed in each 

 cell, hispid with hooked hairs. — Perennial herbs, with opposite petioled 

 membranaceous leaves. Flowers small (white or pale rose-color), in termi- 

 nal and lateral racemes. — Enchanter^s Nightshade. 



- 1. C. Lutetiana (Linn.) : stem niostly pubescent ; leaves ovate, some- 

 what cordate, acuminate, slightly repand-toothed, usually longer than the 

 petiole ; bracts none ; disk projccling beyond the tube of the calvx. — Linn.! 

 spec. 1. p. 8 {13. Canadensis) ; Michx.! fl. 1. p. 17 ; Torr. ! ft. 1. p. 29. 

 C. Canadensis, Muhl. 



Moist rich woodlands, Canada ! to tlic mountainous portions of the South- 

 em States. July. — Stem branching, swollen at the nodes, 1-2 feet high. 

 Petals reddish-wliite. Fruit reflexed. Leaves marked wuh minute Unear 

 dots (under a lens), as in numerous plants of die family. 



y Q. C. alpina (Linn.): glabrous; stem weak; leaves cordate, sliining, 

 rather coarsely toothed, as long as the petioles ; pedicels subtended by 

 minute setaceous bracts ; disk scarcely or not at all prf)jecting beyond the 

 tube of the calvx; fruit pubescent but scarcelv hispid. — Linn..' I.e.; Engl, 

 hot. t. 1057 ,• Michx.! I. c. ; Torr. ! I. c. ; Hook. ! ji. Bor.-Am. 1. p. 215. 



Damp close woods on decayed trunks with mosses, Canada (from the 

 Saskatchawan !) and Northern States! west to Oregon! .July.— Stems 

 commonly 3-8 inches high. Flowers and fruit smaller. — The characters 

 hy wliich we chiefly distinguish tliese two species ajjpear to be constant, 

 except the toothing of the leaves and the length of the petioles, which are 

 not gready to be depended on. All the si)ecimpns of C. intemiedia that we 

 have examined seem to us referible to C. Lutetiana. 



Pleurandra, Raf. ft. Ludoviciana (afterwards changed to Pleurostemon), and 

 Onosuris of the same author (which is not Camissonia, Link) were characterized 

 from the popuhu- descriptions in Robins' Travels in Louisiana, while the plants 

 themselves appear never to have been seen by any botanist whatever. 



Suborder HALORAGE^. R. Br. ; DC. (cxcl. Callitriche.) 



Limb of the calyx 3-4-lobed or entire. Petals 3-4, small, or some- 

 times wanting. Stamens as many or twice as many as the lobes of tho 



