PENTANDRIA. DIGIXIA. 167 



and gibbous, terminating in a subulate awn; margins of 

 the antheridium triangularly produced. 



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

 York Medical Repository, Mexade II. p. 36o. No. 18. by 

 Mr. C. G. iiafinesniie Schmaltz, since the year 1808, under 

 tlie same name. lO. variegata. Stem simple, erect, leaves 

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

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

 thium loundish, longer than the antheridium, central pro- 

 cesses flattened, falcate, point aristate, tube purplish. 

 11. GbtiisifoUa. 12. ampleocicaulis. Leaves glaucous, re- 

 miirbably veined; flowers whitish. A low but elegant 

 species. 



13. PeripJocoefoUa. {^2. laurifoliai Mich. ..i. acumi' 

 fuita,VvviS\i. ^i. cordataP V/ai.t. ^. car. 105.) leaves 

 subsessile, somewhat distant, ovate-lanceolate, narrowing 

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

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

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

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

 of the lepanthium oblong-linear, a little longer than its 

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

 of the antheridium. " Apocynum ('scaoilens' by mis- 

 take) Florida7iinn, Periplocae foliis, longius ab invicem 

 distantibus, floribus ochroleucis, in umbella positis." 

 Pluk. amahh. fol. 18. t. 358. f. 2. Hab. From New Jer- 

 sey to Florida, in the swamps of the sea coast. 



14. pavpercula. {A.foyndann, I aniaick.) Segments of 

 the lepanthium spreading, much longer tiian the antheri- 

 dium, internally bidentate, awn simply subulate, tube as 

 long as the antheridium. Leaves very long and remote. 

 Pluk. amalth. 18. t. 359. f 4? the leaves in this figure are, 

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

 pias? 16. quudrifolia. Lepanthium linear-ublong, nearly 

 flat, internally bidentate, twice tiie lengti) of tiie antheri- 

 dium, awn very short. " Apocynum umbellatum album, 

 latiore foliis tetraphyllon ex Terra Mariana.''^ Piuk. Mant. 

 p. 46- 



17. cinerea. Stem simple, marked with an alternating 

 pubescent line; leaves smootli, very narrow and lineal', 

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

 flowers whitish, segments of the lepanthium truncate, in- 

 ner margin conspicuously bidentate, nearly equal with 

 the antheridium, central awn erect, very short. 



A. 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. Umbells only 4 or 5- 



