ASCLEPIADACEAE. 117 



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. 2. 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. 3. ASCLEPIODORA. 

 Twining vines. 



Petals slightly united at the base : column short. 

 Corolla-lobes glabrous within : crown-lobes broad. 



Stigma flat : crown-lobes not notched. 4. AMPHISTELMA. 



Stigma conic: crown-lobes notched at the apex. 5. LYONIA. 

 Corolla-lobes pubescent within : crown-lobes narrow. 6. METASTELMA. 

 Petals united to about the middle: column elongate. 7. EPICIOX. 



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

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



1. P. clausa (Jacq.) Vail. Leaf -blades 3-8 cm. long, ovate-oblong to oblong- 

 lanceolate, rounded or subcordate at the base: peduncles twice as long as the 

 leaves or more: calyx-lobes oblong-lanceolate: corolla white; lobes oblong to 

 ovate, 4-5 mm. long: follicles 5-7 cm. long: seeds about 3 mm. long. Coastal 

 hammocks, U. keys, L. keys. [E. K.] (Bah., Cuba, Ant.) 



2. ASCLEPIAS [Tourn.] L. Erect or spreading herbs, with narrow or 

 broad leaf -blades. Calyx-lobes 5. Corolla rotate: lobes reflexed. Crown- 

 hoods approximate to the anthers, or nearly so, not adnate to the anther- 

 column, the horn mainly adnate only at the base of the hood. Anther-wings 

 salient at the base. Pollinia longer than the caudicles. MILKWEED. 



1. A. curassavica L. Stems 3-9 dm. tall, sometimes minutely pubescent above : 

 blades oblong to oblong-lanceolate, 5-12 cm. long or more, glabrous or nearly 

 so: hoods ovate, 4 mm. long, much exceeding the androecium; horn stout, ex- 

 ceeding the hood: column about 1.5 mm. long: follicles 3-10 cm. long: seeds 

 6 mm. long. Hammocks, waste places, and cultivated grounds, L. keys. 

 (Bah., Cuba, Ant.) 



3. ASCLEPIADORA A. Gray. Spreading herbs with alternate leaves. 

 Calyx-lobes 5, spreading. Corolla rotate: lobes spreading. Crown-hoods invo- 

 lute and hooded at the apex, with an internal ridge above the middle. Anthers 

 equalling the gynostegium: wings rounded at the base. Pollinia with caudicles 

 nearly as long as the narrow bodies. 



1. A. viridis (Walt.) A. Gray. Stem 2-6 dm. long, stout: leaf -blades oblong 

 to lanceolate, 6-10 cm. long, rather thin: calyx-lobes about 4 mm. long, cilio- 

 late: corolla-lobes greenish, 10-11 mm. long: hoods about 4.5 mm. long, pur- 

 plish or violet: anther-wings 2.5 mm. long: follicles 6-11 cm. long. Pinelands. 

 L. keys. [E. K.] 



4. AMPHISTELMA Griseb. Slender vine with narrow leaf-blades. 

 Calyx-lobes longer than the corolla- tube. Corolla rotate- campanulate : lobes 

 glabrous within. Crown adnate to the corolla: lobes very broad, surpassed by 

 the anthers. Stigma flat. 



1. A. scoparia (Xutt.) Small. Diffuse vine: leaf -blades narrowly linear, 25 

 cm. long: calyx-lobes about 1 mm. long, deltoid: corolla-lobes greenish, 1.5-2 

 mm. long: crown-lobes about 0.5 mm. long: follicles 3.5-4.5 mm. long. 

 Hammocks, U. keys, L. keys. [E. K.] 



