338 APOCYNACEvE. (DOGBANE FAMIl.Y.) 



1. A. Tabernsemontana, 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. TRACHELOSPERMXJM, 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. — TAvining plants, more or less 

 woody, with opposite leaves and small flowers in cymes. (Name from 

 rpa-xv^os, a neck, and airfpjxa, seed, upon the supposition that the seed was 

 beaked.) 



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

 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. Lndiax 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 tlie corolla ; filaments flat, shorter than the arroAv-sliaped 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, Avith upright branching stems, opposite mucronate-pointed 

 leaves, a tough fibrous l)ark, and small and pale cyniose flowers on short pedi- 

 cels. (Ancient Jiame of the Dogbane, composed of airS, from, and kvu>v, a clog ) 



L A. androssemifolium, L. (Spreading Dogbane.; Smooth, or 

 rarely soft-tomentose, brauclied above ; branches dii-ergeiitli/ forking .- leaves 

 oi^ate, distinctly petioled : ajmes loose, spreading, mostly longer than the leaves ; 

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

 much longer than the orate pointed divisi07is of the cali/jc. — 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 !/- flowered cgmes, 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) iv'ith 

 nearly erect lobes, the tube not longer than the lanceolate divisions of th". cali/r. — 

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



Order 67. ASCLEPIADACE^E. (Milkweed Family.) 



Plants with milky juice., and opposite or whorl ed (rarely scattered) entire 

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

 siUe properties^ etc., jnsi as m the lastfamdy. from which they differ in the 



