358 APOCTNACE^. (dogbane FAMILY.) 



1. Ii. lacunosum, Griseb. Leaves (!'- 2' wide) cordate, entire, smooth; 

 petioles (6' -12' long) filiform ; seeds smooth. (Villarsia curdata, EIL) — Shal- 

 low ponds, Florida, and northward. June and July. 



2. Ii. traehyspermuin, Gray. Leaves (3' -5' wide) circular, crenato, 

 rough and pitted beneath ; petioles stout, dotted, elongated ; seeds glandular 

 roughened. (Villarsia trachysporma, Ell.) — Ponds in deep water, Florida to 

 North Carolina, and westward. April - June. 



Ordee 102. APOCYNACEjE. (Dogbane Family.) 



Herbs or shrubs, with acrid milky juice, mostly opposite entire exstipu- 

 late leaves, and regular cymose or panicled flowers. — Calyx free, 5-parted, 

 imbricated in the bud, persistent. Corolla bell-shaped, funnel-shaped, or 

 salver-form, 5-lobed, convolute in the bud. Stamens 5, distinct, inserted 

 on the tube of the corolla : anthers mostly sagittate, erect, introrse. Pol- 

 len granular. Ovaries 2, distinct, their styles united. Fruit few - many- 

 seeded. Seeds anatropous or amphitropous, naked, or bearing a tuft of 

 down at the apex (comose). Embryo straight in scarce albumen. 



Synopsis. 



# Fruit a many-seeded follicle. 

 ^- Seeds comose. Leaves opposite. 



1. APOCYNUM. Corolla bell-shaped, ■with scale-like appendages at the base of the lobes. 



Herbs. 



2. FORSTERONIA. Corolla funnel-shaped. Stamens inserted at the base of the corolla. 



Twining shrubs. 



3. ECHITES. Corolla funnel- or salver-shaped. Stamens inserted above the base of the 



corolla. 



^- •\- Seeds naked. Leaves opposite or alternate. 



4. AMSONIA. Corolla funnel-shaped. Flowers panicled. Leaves alternate. 



5. VINCA. Corolla salver -shaped. Flowers axillary. Leaves opposite. 



* * Fruit a few-seeded drupe. 



6. VALLESIA. Corolla salver-shaped. Leaves alternate. Flowers in cymes. 



1. APOCYNUM, Tourn. Indian Hemp. 



Calyx 5-parted. Corolla bell-shaped, 5-lobed, with scale-like appendages at 

 the base of the lobes. Stamens inserted on the base of the corolla : anthers 

 sagittate. Stigma sessile, 2-lobed. Follicles long and slender. Seeds numer- 

 ous, obovoid, comose. — Perennial erect branching herbs, with opposite oval or 

 oblong mucronate petioled leaves, and small white flowers in lateral and termi- 

 nal cymes. 



1. A. eannabinum, L. Stem smooth, with erect branches ; leaves oval 

 or oblong, mucronate, pubescent beneath ; cymes terminal, close-flowered, shorter 

 than the leaves ; calyx-lobes lanceolate, as long as the tulie of the greenish-white 

 corolla; lobes of the corolla erect. (A. pubescens, R. Br.) — Var. glaberki- 



