ASCLEPIADACEAE. 147 



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

 blades oval, ovate, or suborbicular, 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. [Z7. 

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



5. EHABDADENIA 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. R. 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. Vines. 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 herbaceous or woody plants, with usually umbel-like cymes. 

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

 stigma than in Apocynaceae, the filament-appendages forming a crown. 

 Gynoecium 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. PHILIBERTELLA. 

 Crown single. 



Erect, ascending or spreading herbs. 



Corolla-lobes reflexed during anthesis : 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 midrib. 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. ASCLEPIADOBA. 

 Twining vines. 



Petals slightly united at the base : column short. 

 Corolla-lobes glabrous within : crown-lobes broad. 



Stigma flat : crown-lobes not notched. 5. AMPHISTELMA. 



Stigma conic : crown-lobes notched at the apex. 6. LYONIA. 

 Corolla-lobes pubescent within : 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. 



