Indian Hemp (Dogbane)
A shrubby, upright perennial with opposite branches and milky sap. Flowers are tiny, 5-pointed bells, massed in cymes, white or greenish white, attractive to bees. Leaves opposite, smooth-edged, variable, oblong or lance-shaped, hairy or not hairy, with conspicuous petioles (stalks). Stems are reddish and often grow higher than the flower cluster.
Similar species: Spreading dogbane (A. androsaemifolium) has larger flowers in looser (less dense) clusters. Its flowers are pink or white with red inside and the petal lobes spread. The leaves tend to droop or spread. The two dogbanes live in the same habitats and can produce hybrids that can make identifications tricky.