APOCYNACE^. (dOGBAXE FAMILY.) 341 



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

 petioles (6' -12' long) filiform; seeds smooth. — Shallow pouds, Florida, and 

 northward . June - July. 



2. L. trachyspermum, Gray. Leaves (3' -5' wide) circular, crenate, 

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

 roughened. — Touds in deep water. April- June. 



Order 95. APOCYNACE.^. (Dogbane Family.) 



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

 stipulate leaves, and regular cymose or panicled flowers. — Calyx free, 

 5-parted, imbricated in the bud, jiersistent. Corolla bell-shaped, fun- 

 nel-shaped, or salver-form, o-lobed, convolute in the bud. Stamens o, 

 distinct, inserted on the tube of the corolla: anthei's mostly sagittate, 

 erect, introrse. Pollen granular. Ovaries 2, di-stinct, their styles 

 united. Fmit few -many-seeded. Seeds anatropous or amphitropous, 

 naked, or bearing a tuft of down at the aj)ex (comose). Embryo 

 straight in scarce albumen. 



Synopsis. 



* Fruit a many-seeded follicle. 

 •I- Seeds comose. Leaves opposite. 



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



Herbs. 



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



corolla. 



■4- 4- Seeds naked. Leaves opposite or alternate. 



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



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



* * Fruit a few-seeded drupe. 



5. 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 nu- 

 merous, obovoid, comose. — Perennial erect branching herbs, with oppo.^ite 

 oval or oblong mucronate petioled leaves, and small wliite flowers in lateral 

 and terminal cymes. 



1. A. cannabinum, L. Stem smooth, with erect branches; leaves ovnl 

 or oldong, mucronate, pubescent beneath ; cymes terminal, close-flowered, 

 .shorter than the leaves ; calyx lobes lanceolate : lobes of the greenish wliite 

 corolla erect. — Var. glaberrimum. Smooth throughout ; leaves narrower, 

 often acute at each end. — Dry or damp soil. July - Augu,st. — Stem 2*^ - 3° 

 high. Leaves 2' -3' long. Corolla 2" long. 



2. A. androsaemifolium, L. Stem smooth, witlispro.iding branches; 

 leaves oval or ovate, smooth, or pubescent beneath ; cymes axillary and termi- 



