!44 OCTANDRIA. MONOGYNIA. 



■^vjiich it Is nearly aliied, but cannot possibly be the sat?1e 

 species, being by the calix much more nearly related to R. 

 q-hibe'lu, but the leaves, liabit. and an.e^uiar stem, separate 

 it from that species; in Ji. ciUosa the border of the calix is 

 yemarkably iar,^e, iiie seg-menls expanding nearly to the 

 length of the ventricose base, and not coalescing into a 

 tube as is usual in this genus. Obs. About 6 to 10 inches 

 high; leaves nearly as broad as long, about 5 lines; regu- 

 larly and mucroiuilately serrulate, the radical leaves nearly 

 round, and with tlie maigins more entire; flower purple, 

 as large as that of R. glabsUa, solitary and terminal, or 

 simply in 3s; never subcorymbose. 



5. glabella. Tlie largest and most ornamental of the 

 species indigenous to the United States. Stem nearly cy- 

 lindric, and very smooth, as well as the whole plant, with 

 the exception of the calix; leaves lanceolate, sessile, and 

 entire; calix glandularly hirsute, border minute, flowers 

 subcorymbose. Root tuberous, perper.dicular, and very 

 large, with a spongy bark, stems 2 to 3 feet high, and con- 

 siderably branched. 6. stricta. Ph. Apparently a variety 

 of Ji. glabella. 



7. lutea. Every where glandularly pilose, but particular- 

 ly the steni, which is obtusely quadi-angula^; lower leaves 

 fiblong-obluse, the upper much smaller and acute; calix fun- 

 nelfonn, with a conspicuous and acute border; petals yel- 

 low, rutiier small, as well as the stamina, which are erect, 

 Ubs. Root perennial, fibrous. Stem about 12 inches, qtiad- 

 rangular, branchlets approximating towards the summit of 

 the stem, 1 and rarely 3-fiowered, petals oval and obtuse; 

 flowers ^ibout the size of Oenothera sinnata. 



8. linearifotia. Stem c} lindric pubescent, leaves alternate, 

 linear-oblong, obtuse, sessile, every where pubescent; flow- 

 ers solitary.— Lamark, Encycl. 6. p. 2 In Carolina. Bosc. 

 Flowers yellow. A variety of the preceding? 



9, * m.gnsufoUa. Stem subterete, hirsute, leaves linea^' 

 lanceolate, somewhat oblong, hirsute, nxills foliose; flowers 

 cymose, cyme bifid; calix c) lindric, short, and very smooth. 

 Stamina declinate. i^. /fmceo/a/a, Walter, B.mariana, y. 

 exalbida, Mich. Flor. Am. l.p. 221. II ab, Aroimd Savan- 

 nah, in Georgia, also in Carolina. Obs. Stem one and a half 

 to two feet high, leaves numerous and narrow, scarcely 

 S-nerved, subpetiolate; flowers constantly disposed in a 

 r.aked, bifid cyme, never in a trichotomous p.anicle as in 

 R. mariana; calix verv smooth; in R manana twice as long 

 and hairy; flowers smaller, nearly white. 



This genus of about 30 species, excepting the above, is 

 exclusively indigenous to the tropical parts of x\merica. 



