Sub-category: Dogbane family
A perennial herbaceous plant which grows up to 2 m. The stems are reddish and contain a milky latex. The leaves are opposite, simple broad lanceolate, 7 to 15 cm long and 3 to 5 cm broad, entire, and smooth on top with white hairs on the underside. It has large sepals, and a five-lobed white corolla.
Grows in open wooded areas, ditches, and hillsides. It is found in gravelly or sandy soil, mainly near streams in shady or moist places. Also found in meadows. Flowers from July to August.