350 ASCLEPIADACE.E. (MILKWEED FAMILY.) 



9. AMPHISTELMA, Griseb. 



Calyx 5-parted. Corolla minute, rotate; crowu obtusely 5-parted. Pollen- 

 masses ovoid. Gynostegium sessile, shorter than the crowu, tint. Follicles 

 divaricate, linear. Seeds comose. A woody vine. 



1. A. filiforme, Griseb. Stems much-branched, pubescent in lines; 

 leaves thin, linear, smoothish ; umbels nearly sessile, few-flowered; calyx 

 lobes ovate ; corolla smooth, the spreading lobes lanceolate, obtuse ; crown 

 shorter than the gynostegium ; follicles very slender ; seeds linear, wingless. 

 - Dry rich soil near the coast, Florida. Leaves ' - 1' long. Flowers green, 

 less than a line long. Follicles 1' long. 



10. PHILIBERTIA, HBK. 



Calyx 5-parted. Corolla wheel-shaped, 5-parted. Crown double ; the ex- 

 terior forming a ring at the base of the corolla; the interior longer, 5-leaved. 

 Stigma pointed, notched. Follicles slender, smooth. Seeds comose. Erect 

 or twining herbs. Leaves often cordate. Flowers yellow or white, in lateral 

 umbels. 



1. P. viminalis, Gray. Stem smooth and twining; leaves nearly ses- 

 sile, oblong, mucronate, rounded at the base; peduncles stout, 8-12-flowered, 

 2-3 times as long as the leaves and pedicels ; lobes of the corolla ovate, ob- 

 tuse, spreading ; the outer surface, like the calyx and pedicels, pubescent ; 

 leaves of the inner crown oval, rather exceeding the stigma and anthers. 

 South Florida. Leaves somewhat fleshy, 9" -12" long. Corolla 3" wide. 

 Ovary villous. 



11. GONOLOBUS, Michx. 



Calyx 5-parted, spreading. Corolla wheel-shaped, 5-parted, the lobes spread- 

 ing, twisted in the bud. Crown a wavy-lobed ring at the throat of the corolla. 

 Gynostegium flattened, depressed. Anthers opening transversely. Pollen- 

 masses horizontal. Follicles inflated, angled, and often armed with soft 

 spines. Seeds comose. Twining herbs, with opposite petiolate cordate 

 leaves, and yellowish or purplish flowers, in lateral corymbs or umbels. 



* Follicles spineless, ribbed. 



1. G. macrophyllus, Michx. Hairy; leaves oblong-ovate, cordate, 

 abruptly acuminate ; umbels peduncled, several-flowered ; pedicels spreading, 

 unequal, shorter than the petioles ; corolla dull purplish, conical in the bud ; 

 the lanceolate obtuse lobes more or less pubescent within, green at the apex ; 

 follicle strongly ribbed. Low thickets. July - August. Leaves 2' - 6' 

 long. 



2. G. suberosus, R. Br. Leaves cordate, acuminate, minutely pubes- 

 cent or smoothish ; umbels 3 - 9-flowered, much shorter than the petiole ; 

 corolla broadly conical in the bud, twisted, the lobes triangular-lanceolate, 

 dusky, minutely pubescent within, but sometimes smooth, hardly double the 

 length of the calyx lobes; crown 10-creuate (Gray). Near the coast, Vir- 

 ginia to Florida. 



