ASCLEPIADACEAE. 147 



1. U. lutea (L.) Britton. Stems 3-30 dm. long, reclining or twining: leaf- 

 blades oval, ovate, or siiborbicular, 2.5-5 cm. long: calyx-lobes lanceolate, 8-11 

 mm. long: corolla yellow, the campanulate throat over 2 cm. long: anthers 

 with linear-filiform appendages at the apex: follicles 12-15 cm. long. [U. 

 Andrewsii (Chapm.) Small.] — Pinelands. — F. K. (Bah., Cuba, Ant.) 



5. RHABDADENIA Muell. Arg. Vines, sometimes nearly erect. Leaves 

 opposite. Calyx-lobes relatively broad and short. Corolla-tube gradually 

 dilated into the funnelform throat. 



Corolla yellow ; limb 2.5-3 cm. wide : erect herb, the branches pubescent. 



1. li. corallicola. 

 Corolla white ; limb 4.5-5 cm. wide : twining vine, the branches 



glabrous. 2. R. Mflora. 



1. R. corallicola Small. Stems 3-11 dm. long: leaf-blades oblong or nearly so, 

 1-3 cm. long, more or less revolute: calyx-lobes deltoid-ovate, 2-2.5 mm. long: 

 corolla 2.5-3 cm. long; lobes 1-1.5 cm. wide: follicles 8-11 cm. long. — Pine- 

 lands. — F. K. 



2. R. biflora (Jacq.) Muell. Arg. Stems greatly elongate: leaf -blades oblong 

 or oblong-lanceolate, 4-9 cm. long, apiculate: calyx-lobes oblong or nearly so, 

 4-5 mm. long: corolla 5-6 cm. long; lobes 2.5-3 cm. wide: follicles 12-15 cm. 

 long. — Coastal hammocks. — (Bah., Cuba, Ant.) 



6. ECHITES P. Br. Tines. Leaves opposite. Flowers relatively large. 

 Calyx with glands within. Corolla salverform, the throat narrowed to the 

 mouth. 



1. E. Echites (L.) Britton. Stems widely twining: leaf -blades ovate to oval, 

 4-9 cm. long: calyx-lobes triangular, 2.5-3.5 mm. long: corolla white or green- 

 ish-white; tube 5-6 cm. long; lobes 1.5-2.5 cm. long: follicles 15-20 cm. long. — • 

 Pinelands.— F. K. {Bah., Cuba, Ant.) 



Family 2. ASCLEPIADACEAE. Milkweed Family. 



Perennial hei-baeeous or woody plants, with usually umbel-like eynies. 

 Androecium of usually 5 stamens, with the anthers more adherent to the 

 stigTua than in Apocynaceae, the filament-appendages foinning a crown. 

 Gynoeeium of 2 carpels with the stigmas united; only one carpel usually 

 maturing. 



Crown double, the outer a shallow ring, the inner with 5 fleshy hood-like scales. 



1. PlIILIBERTELLA. 



Crown single. 



Erect, ascending or spreading herbs. 



Corolla-lobes reflexed during antbesis : hoods of the crown 

 crestless or each with a horn-like process. 

 Crown-hoods without horns, or horn wholly adnate to 



the hood as a midril). 2. Acerates. 



Crown-hoods with projecting horns. 3. Asclepias. 



Corolla-lobes erect-spreading during anthesis : hoods of 



the crown pendulous or saccate at the base, curved up- * 



ward, obtuse, crested within, at least in the upper part. 4. Asclepiadora. 

 Twining vines. 



Petals slightly united at the base : column short. 

 Corolla-lobes glabrous within : crown-lobes broad. 



Stigma flat: crown-lobes not notched. 5. Amphistei.ma. 



Stigma conic: crown-lobes notched at the apex. <!. Lyonia. 

 Corolla-lobes pubescent witWn : crown-lobes narrow. 7. Metastelma. 

 Petals united to about the middle : column elongate. 8. Epicion. 



1. PHILIBERTELLA Vail. Vines with narrow or broad leaf-blades. 

 Calyx 5-lobed. Corolla rotate: lobes broad, glabrous within. Anthers coherent. 



