26 TRIANDRIA MOXOGTNIA. 



cmarginate, tube persistent, calicine. Stamina 

 cxserted. Seed 1, coriaceously coated, obconic, 

 with 5-fiirrows. 



Annual or perennial; stem herbaceous, leaves opposite; 

 flowers axillary and dichotomously paniculate, or corym- 

 bose, from 1 to 5 in a common expanding campanulate, or 

 almost peltate involucrum, extremely evanescent, and ge- 

 nerally small, 5-parted, laminae deeply emarginate, the 

 base persistent and calicine, investing the seed. Stami- 

 na 3, 4 and 5. Sllgma capitate. — Nearly allied to the pre- 

 ceding genus, and also to Alirubilis. 

 Species. 1. nyctaginea. Mich. 



Obs. Entirely smooth; stem jointed, leaves broad cor- 

 date, acute; flowers for the most part corymbosely ag- 

 gregate, and terminal, also axillary; in stems imperfectly 

 developed, all axillary; involucrum 5-cleft, 3-5-fiowered, 

 (and as in all the otlier species, at length much larger 

 tJian the fruit.) 



liooi large and tuberous, probably medicinal. — On th.e 

 alluvions of the Missouri, common. 



2- .^Ibida. Walter ©. 3. * pilosa. Stem nearly erect, 

 hair}'; leaves oval or lanceolate-oval, obtuse, entire; flow- 

 ers siib-paniculate, axillary and terminal; involucrum 

 about 3flowered. 



Obs. Leaves sometimes hairy; nearly allied to the C 

 nyctaginea. Flowers pale red, stamens exserted, root pe- 

 rennial. 



Habitat. Near the Missouri,~around the Arikaree 

 village, &.C. 



MUonia ovata. Pursh, vol. i. p. 97. The C. avata of 

 Peru appears to be but l-flowcred. 



4. C. hirsuta. Pursh, perhaps a variety of the above. 

 5. C. * angustifoUa. Stem round, erect, smooth; involu- 

 crum and peduncle pubescent; leaves linear, sessile, rare- 

 ly subdenticulate; flowers aggregate, paniculate, and ax- 

 illary; involucrum mostly 3-flowered. 



Obs. Root perennial, tuberous as the preceding; leaves 

 smooth; stem erect, a little branched above; seeds as in 

 all the rest clavate, obconic, rather rugose, with 5 fur- 

 rows. Flowers pale red. Stamens exserted On hills 

 near tiie confluence of Teeton river, Missouri, and from 

 thence probably to the mountains. 



C. angustifoUa. T. Nuitali in Fraser's Catalogue. 1813. 



C.Unearii-y Pursh, in Supplement, vol ii. p. 728. 



6. * decumbent. Stem round, decumbent, low; leaves en- 



