Spring Flora of Oklahoma 
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ing within 5 small appendages alternate with the stamens, 
5-lobed. Stamens inserted on the base of the corolla. 
Disk 5-lobed. Carpels 2. Stigma ovoid, obtuse. Follicles 
slender, elongated, terete. Seeds small, tipped with a long 
coma. 
Leaves and cymes glabrous, or sparingly pubescent. 
1. A. cannabinum. 
Leaves, cymes, and often the whole plant densely pub¬ 
escent. 2. A. pubescens. 
1. Apocynum cannabinum L. India Hemp. Stem extensively 
branched, glabrous or nearly so. Leaves oblong, lanceolate-oblong 
or ovate-oblong, acute or obtuse, and mucronate at the apex, nar¬ 
rowed or rounded at the base, glabrous above, sometimes pubescent 
beneath, 2'-G' long. Oymes dense. Corolla greenish-white. Folli¬ 
cles 4' long. 
In fields and thickets. May-July. Lincoln and Oklahoma coun¬ 
ties. 
2. Apocynum pubescens R. Br. Velvet Dogbane. Whole plant 
densely velvety-pubescent, or the stem sometimes glabrate. Leaves 
oval to elliptic, strongly mucronate. Petioles l"-2" long. Cymes 
dense. Calyx segments about as long as the tube of the corolla. 
Follicles about 4' long. 
In dry sandy soil. April-August. Payne County. 
FAMILY 71. ASCLEPIADACE7E. Milkweed Family. 
Shrubs or herbs, often twining. Juice usually milky. 
Leaves generally opposite or whorled, entire, without 
stipules. Flowers regular. Calyx 5-parted. Corolla 5- 
parted. Stamens 5. Filaments usually united around 
the styles. Often with hook-like appendages, each with 
an incurved horn borne on the stamen tube and forming 
a crown around the stigma. Ovary free from the calyx 
tube, of 2 carpels, more or less united below but uncon¬ 
nected above. Styles 2. Stigmas 5 angled. Ovules sev¬ 
eral-many. Fruit consisting of 1 or 2 pods. 
