GONOLOBus. PENTANDRIA. DIGYNIA. 279 



ferred to his Gon. carolinense ; hy Pur s h to G. l<eve Mi c h. .? 

 and hy Elliott to G. hirsutus, Br ow n' s G. carolinense 

 also includes G. macro/i/iyllus of Mi c hau x. Cynanchum 

 discolor, Bot. Mag. t. 1273, does not appear to differ trom 

 Gon. macrofi/iyllus oi Michau x and Elliott. 



189. ASCLEPIAS, L.—R. Brown, 



Calyx small, 5-parted. Corolla rotate, S-parted, 

 mostly reflexed. Stamineal crown simple, 5-leaved ; 

 leaflets opposite the anthers, with a subulate averted 

 process at the base. Stigma with the 5 angles (cor- 

 pusculesj opening by 5 longitudinal chinks. Pollinia 

 5 distinct pairs, pendulous, suspended in the cells of 

 the anthers from the angles of the stigma. Follicles 

 ventricose, smooth or muricate. Seed comose. Gen. 

 pi. 429. R. Brown in JFern. Trans. I. p. 37. 

 Nutt. Gen. I. p. 165. Roem. ^ Schult. Gen, 

 1086. Nat. Ord. AscLEPiADEiEi?. ^roK;;?. Apo- 

 gij^zmJuss, Swallow-wort Silk-weed^ ^c^ 



* Leaves ofifiosite. 

 1. A. syriaca L. : stem subsimple, leaves lanceolate-ob 

 long, petiolale, tomentose beneath ; umbels nodding ; nectary 

 bldentate ; follicles muricate. Willd. Spec. I. p. 126*3o 

 Piirsk FLl.p. IS\. B i g. Bost. ip. 62. Roem,^- 

 Schult. y\.p. 62. A. syriaca^. Mich. Fl.l.p.Wb. A. 

 syriaca /S. illinoensis P ers. Syn, I, p. 275» Asclepias caule 

 erecto, &lc. Cold. J\''oveb. 41. 



Root perennial, long. Stem 2—4 feet high. Leaves opposite, 

 4 — 6 inches long, the upper ones gradually acunrainate, whitish- 

 tomentose beneath. Umbels 2 — 3, subterminal, 1 5 — 20-flower- 

 ed ; fiedicels an inch, or an inch and a half long, tomentose, 

 bracteate at the base. Flonvers large, sweet-scented. Seg-' 

 ments of the calyx lanceolate, acute, reflected. Corolla pale 

 purple ; segments oblong, obtuse, reflected, 3 times as long as 

 the calyx. A'cctary or stamineal croivn of 5 white fleshy 

 obtuse cuciiUate leaflets; apex 2-toothed ; horn acute, in- 

 curved, exserted. Jniheridiumi oblong, sessile, divided into 

 5 lobes by the corpuscules of the stigma ; lobes 2-celled, with 

 reflexed margins. Pollinia clavate, compressed, waxy and 

 smooth, (not separable into grains,) united in pairs by a small 

 black tubercle, and alternating in the cells of the antheridium, 

 each pair of the masses of pollen being thus suspended in the 



-}• A term proposed by jMr. JVjztt all for the antherold cells, or anthers, 

 ef most authors. 



