338 APOCYNACEJE. (DOGBANE FAMILY.) 



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

 young, soon glabrous ; leaves 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, N. C. to S. Ind. and Mo., south to Fla. and Tex. May, June. 



2. TRACHELOSPERMTJM, Lemaire. 



Calyx 5-parted, with 3-5 glands at its base inside. Corolla funnel-form, 

 not appendaged ; limb 5-lobed. Stamens 5, included ; filaments slender ; an- 

 thers arrow-shaped, with an inflexed tip. 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. (Name from 

 rpax^os, a neck, and cnrcpfjia, seed, upon the supposition that the seed was 

 beaked.) 



1. T. diff6rme, Gray. Nearly herbaceous and glabrous ; leaves oval-Ian 

 ceolate, pointed, thin ; calyx-lobes taper-pointed ; corolla pale yellow. (Forste 

 ronia difformis, A. DC.) Damp grounds, Va. to Fla. and Tex. April. 



3. APOCYNUM, Tourn. DOGBANE. INDIAN HEMP. 



Calyx 5-parted, the lobes acute. Corolla bell-shaped, 5-cleft, bearing 5 tri- 

 angular appendages below the throat opposite the lobes. Stamens 5, on the 

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

 whicjji converge around the stigma, and are slightly adherent to it. Style 

 none ; stigma large, ovoid, slightly 2-lobed. Fruit of 2 long (2 -7') and slen 

 der follicles. Seeds comose, with a tuft of long silky down at the apex. 

 Perennial herbs, with upright branching stems, opposite mucronate-pointed 

 leaves, a tough fibrous bark, and small and pale cymose flowers on short pedi- 

 cels. (Ancient name of the Dogbane, composed of air6, from, and KVO>V, a dog.) 



1. A. androsaemifolium, L, (SPREADING DOGBANE.) Smooth, or 

 rarely soft-tomentose, branched above ; branches divergently forking ,- leaves 

 ovate, distinctly petioled : cymes loose, spreading, mostly longer than the leaves ; 

 corolla (pale rose-color, 4'' broad) open-bell-shaped, with revotute lobes, the tube 

 much longer than the ovate pointed divisions of the calyx. Borders of thickets ; 

 common. June, July. 



2. A. cannbimim, L. (INDIAN HEMP.) Glabrous or more or less 

 soft-pubescent; stem and branches upright or ascending (2-3 high), termi 

 uated by erect and close many-flowered cymes, which are usually shorter than 

 the leaves ; leaves from oval to oblong and even lanceolate, short-petioled or 

 sessile, with rounded or obscurely cordate base ; corolla (greenish-white) with 

 nearly erect lobes, the tube not longer than the lanceolate divisions of the calyx. 

 Moist grounds and banks of streams; common. Very variable. July, Aug. 



ORDER 67. ASCLEPIADACEJE. (MILKWEED FAMILY.) 



Plants with milky juice, and opposite orwhorled (rarely scattered) entire 

 leaves; the follicular pods, seeds, anthers (connected with the stigma), sen- 

 sible properties, etc., just as in the last family from which they differ in the 



