APOCYNACEiE. (DOGBANE FAMILY.) 393 



1. Amsonla. Seeds naked. Corolla with the tube bearded inside. Anthers longer than the 



filaments. Leaves alternate. 



2. Forgteronla. Seeds comose. Corolla funnel-form, not appendaged. Filaments slen- 



der. Calyx glandular inside. Leaves opposite. 



3. Apooynum. Seeds oomose. Corolla bell-shaped, appendaged within. Filaments short, 



broad and flat. Calyx not glandular. Leaves opposite. 



1. AMSONIA, Walt. Amsonia. 



Calyx 5-parted, small. Corolla with a narrow funnel-form tube bearded in- 

 side, especially at the throat ; the limb divided into 5 long linear lobes. Sta- 

 mens 5, inserted on the tube, included : anthers obtuse at both ends, longer than 

 the filaments. Ovaries 2 : style 1 : stigma rounded, surrounded with a cup-like 

 membrane. Pod (follicles) 2, long and slender, many-seeded. Seeds cylindri- 

 cal, abrupt at both ends, packed in one row, naked. — Perennial herbs, with 

 alternate leaves, and pale blue flowers in terminal panicled cymes. (Said to be 

 named for a Mr. Charles Amson. ) 



1. A. Tabernsemont&na, Walt. Loosely somewhat pubescent or hairy 

 when young, or soon glabrous ; leaves varying from ovate-lanceolate to linear- 

 lanceolate, taper-pointed ; calyx-lobes short, awl-shaped ; tube of the bluish 

 corolla little longer than the lobes, the upper part either hairy when young or 

 glabrous. — Low grounds, Illinois, Virginia f and southward. May, June. 



2. PORSTERONIA, Meyer. Fobsiekonia. 



Calyx 5-parted, with 3-5 glands at its base inside. Corolla funnel-form, not 

 appendaged ; the limb 5-lobed. Stamens 5, included : filaments slender : an- 

 thers arrow-shaped, with an inflexed tip, adhering to the stigma. Pods (follicles) 

 2, slender, many-seeded. Seeds oblong, with a tuft of down. — Twining plants, 

 more or less woody, with opposite leaves and small flowers in cymes. (Named 

 for Mr. T. F. Forster, an English botanist. ) 



1. !P. difibrmis, A. DC. Nearly herbaceous and glabrous; leaves oval- 

 lanceolate, pointed, thin; calyx-lobes taper-pointed; corolla pale yellow. — 

 Damp grounds, Virginia, S. Illinois, and southward. April. 



3. APbCYNUM, Toum. Dogbane. Indian Hemp. 



Calyx 5-parted, the lobes acute. Corolla bell-shaped, 5-clcft, bearing 5 trian- 

 gular appendages in the throat opposite the lobes. Stamens 5, inserted on the 

 very base of the corolla : filaments flat, shorter than the arrow-shaped anthers, 

 which converge around the ovoid obscurely 2-lobed stigma, and are slightly ad- 

 herent to it by their inner face. Style none : stigma large, ovoid, slightly 2- 

 lobed. i"ruit of 2 long and slender follicles. Seeds comose with a long tuft of 

 silky down at the apex. — Perennial herbs, with upright branching stems, oppo- 

 site mucronate-pointed leaves, a tough fibrous bark, and small and pale cymose 

 flowers on short pedicels. (An ancient name of the Dogbane, composed of 

 i/TTo, from, and Kvav, a dog, to which the plant was thought to be poisonous.) 



1. A. androssemifblium, L. (Spkeading Dogbane.) Smooth, 

 branched above ; branches divergently forking ; leaves ovate, distinctly petioled ; 



