244 OCTANDRIA. MONOGYNIA. 



which it is nearly allied, but cannot possibly be the same 

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

 glabella, but the leaves, habit, and an.a^u'.ar stem, separate 

 it from that species; in li. ciliosa the border of the calix is 

 remarkably iarg-e, the seg-ments 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; reg-u- 

 larly and mucronulaiely serrulate, the radical leaves nearly 

 round, and with the margins more entire; flower purple, 

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

 simply in Ssj never subcorymbose. 



5. glabella. The 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 

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

 entire; calix glandularly hirsute, border minute, flowers 

 subcorymbose. Hoot tuberous, perpendicular, and very 

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

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

 of R. glabella. 



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

 ly the stem, which is obtusely quadrangular; lower leaves 

 oblong-obtuse, the upper much smaller and acute; calix fun- 

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

 low, rather small, as well as the stamina, which are erect. 

 Obs. Root perennial, fibrous. Stem about 12 inches, quad- 

 rangular, branchlets approximating towards the summit of 

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

 flowers about the size of Oenothera simiata. 



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

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

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

 rlowers yellow. A variety of the preceding? 



9. * aiigvstifolia. Stem subterete, hirsute, leaves linear- 

 lanceolute, somewhat oblong, hirsute, axills foliose; flowers 

 cymose, cyme bifid; calix cylindric, short, and very smooth. 

 Stamina declinate. 7^. /tnzceo/a/a, Walter. R.marlana, y. 

 exalbUla, Mich. Flor. Am. l.p. 221. Hab. Aroimd Savan- 

 nah, in Georgia, also in Carolina. Obs. Stem one and a h;df 

 lio two feet high, leaves numerous and narrow, scarcely 

 3-nerved, subpetiolate; flowers constantly disposed in a 

 naked, bifid cyme, never in a trichotomous panicle as in 

 R. mariana; calix very smooth; in R. maviana 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 America. 



