PENTANDRIA. DIGYNIA. 167 



and gibbous, terminating in a subulate awn; margins of 

 the antheridium triangularly produced. 



8. purpurascens. 9. viridifiora. Described in the New 

 York Medical Repository, Hexade II. p. 360, No. 18. by 

 Mr. C. G. Rafinesque Schmaltz, #ince the year 1808, under 

 the same name. 10. variegata. Stem simple, erect, leaves 

 elliptic-ovate, peiiolate, smooth, margin pubescent; pedi- 

 cells pubescent; root horizontal. — Segments of the lepan- 

 thium roundish, longer than the antheridium, central pro- 

 cesses flattened, falcate, point aristate, tube purplish. 

 11. obtusifolia. 12. a?nplexkauhs. Leaves glaucous, re- 

 mrxrbably veined; flowers whitish. A low but elegant 

 species. 



13. Periploaefolia. (Jl. ImirifoUa, Mich. ^. acumi- 

 Tiata, PuRSH. ji. cordata? Walt. fl. car. 105.) Leaves 

 subsessile, somewhat distant, ovate-lanceolate, narrowing 

 upwards, very acute, smooth on both sides, margin aspe- 

 rate; umbeils mostly 2, naked, lateral; root an arrounded 

 tuber, (almost similar to that of the spiked species of 

 Liatris.) — Corolla greenish on the under side. Segments 

 ttfthe lepanthium oblong-linear, a little longer than its 

 awn, which is simply subulate, and about twice the length 

 of the antheridiun*. " Apocynum ('scandens' by mis- 

 take) Floridahum, Periplocse folils, longius ab invicem 

 distantibus, floribus ochroleucis, in umbella positis." 

 Pluk. amalth. fol. 18. t. 358. f 2. Has. From New Jer- 

 sey to Florida, in the swamps of the sea coast 



14. panpercnla. (Jl.fondana, Lamarck.) Segments of 

 the lepanthium spreading, much longer than the antheri- 

 dium, internally bidetitate, awn simply subulate, tube as 

 long as the antheridium. Leaves very long and remote. 

 Pluk. amalth. 18. t- 339. f 4? the leaves in this figure are, 

 however, alternate. 15. viridis. Probably not an Ascle- 

 pias? 16. quadrifoUa. Lepanthium linear-oblong, nearly 

 flat, interiially bideatate, twice the length of tlie antheri- 

 dium, awn very short. "Apocynum umbellatum album, 

 latiore foliis tetraphyllon ex Terra Mariana.*' Pluk. Mant. 

 p. 46- 



17. cinerea. Stem simple, marked with an alternating 

 pubescent line; leaves smooth, very nan-ow and linear, 

 margin revolute, umbeils lateral, erect, very few flowered; 

 flowers whitish, segments of the lepanthium truncate, in- 

 ner margin conspicuously bidentate, nearly equal with 

 the antheridlam, central awn erect, very short. 



^ cinerea. Walter. Flor. Carol. 



A very slender, herbaceous species, with the habit of 

 A. verticillata. About a foot high. Leaves few, 3 to 4 

 inches long, scarcely a line wide. Umbeils only 4 or 5- 



