148 ASCLEPIADACEAE. 



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

 lanceolate, rounded or subcordate at the base: in-dun, K-> t\\i,v as long as the 

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

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

 hammocks. F. K. (Bo*., Cuba, Ant.) 



2. ACEBATES Ell. Erect or spreading herbs, with narrow or relatively 

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

 hoods approximate to the anthers, the column very short or stout. 



1. A. floridana (Lam.) A. Hitchc. Plants 3-8 dm. tall or more, green: leaf- 

 blades linear to elongate linear-lanceolate, 7-16 cm. long: corolla-lobes 3-3.," 

 mm. long: hoods about 2 mm. long: anther- wings 1.5-2 mm. long: pollinia- 

 bodies nearly 1 mm. long: seed-coma 3-4 cm. long. Everglades. GREEN- 



MILKWEED. 



3. 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. 



Follicles erect on deflexed pedicels : horn not longer than the hood : flowers orange- 

 yellow. 

 Hoods 6-7 mm. long: leaf-blades truncate or cordate at the base. 



1. .1. RolftH. 



Hoods 3-4 mm. long: leaf-blades tapering at the base. _. A. lanceolata. 



Follicles erect on erect pedicels : born long-exserted : flower* 



greenish-white. 3. A. vertk-itlntn. 



1. A. Rolfsii Britton. Stems erect or ascending, 1-3 dm. tall, hirsute: leaf- 

 blades mainly oblong, sometimes narrowly so, when broad sometimes fiddle- 

 shaped, 3-7 cm. long, truncate or cordate at the base: corolla-lobes oblong, 6-7 

 mm. long: horn arising below the hood-auricles. Pinelands. 



2. A. lanceolata Walt. Stems 4-11 dm. tall, glabrous or nearly so: leaves few, 

 distant; blades elongate-linear, linear-lanceolate, or narrowly lanceolate, mo>tly 

 1-2 dm. long, narrow at the base: corolla-lobes oblong, 8-9 mm. long: horn 

 arising from the base of the hood. Everglades. 



3. A. verticillata L. Stems 3-8 dm. tall, commonly pubescent in lin.-: 

 leaves numerous, close; blades narrowly linear to linear-filiform, 2-6 cm. long: 

 corolla-lobes greenish-white, 3-4 mm. long: hoods about 1 mm. long, about 

 equalling the androecium or shorter, with erect auricles within; horn M>n. !.-. 

 much exceeding the hood: column about 1 mm. long. Pinelands. 



4. A8CLEPIADOBA 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. Antlin- 

 equalling the gynostegium: wings rounded at the base. Pollinia with cau.li. -li- 

 nearly as long as the narrow bodies. 



1. A. vlrldii (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. 

 F. K. 



5. AMPHISTELMA <iri*.l.. si-i.-l.-r xir:, with narrow le.-r 

 Calyx-lobes longer than the corolla tul>r. Corolla rotate-campanulate : lobes 



