338 APOCYNACE^. (dogbane FAMILY.) 



1. A. Tabemsemontana, 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. lud. and Mo., south to Fla. and Tex. May, June. 



2. TRACHELOSPERMXJM, Lemaire. 



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

 not appeudaged ; 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 

 rpoLxv^os, a neck, and o-Tre'p^a, seed, upon the supposition that the seed was 

 beaked.) 



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

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

 ronia difformis, ^1. DC.) — Damp grounds, Va. to Fla. and Tex. April. 



3. APOCYNUM, Touru. Dogbane. Indian Hemp. 



Calyx 5-parted, tlie 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, 

 which converge around the stigma, and are sliglitly 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 l>ranchiug 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 a-rrS, from, and icwcoj', o dog.) 



1. A. androssemifolium, L (Spreading Dogbane.) Smooth, or 

 rarely soft-tomentose, branched above; branches divergenthj forking . leaves 

 ovate, distinctly petio'ed : ci/mes loose, spreading, mostly longer than the leaves ; 

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

 much longer than the ovate pointed divisions of the cali/v. — Borders of thickets ; 

 common. June, July. 



2. A. cannabinum, L. (Indian Hemp.) Glabrous or more or less 

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

 nated by erect and close man n flowered ci/mes, 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) ivith 

 nearlij 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. ASCLEPIADACE^E. (Milkweed Family ) 



Plants luith milk y 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 



