BLADDER CAMPION, Silene cucubalus Wibel. 1, upper part of plant in bloom; 2, root and base of plant; 3, seed pod; 4, seed. Perennial, propagated by seeds and creeping rhizomes. Stems 1 to 1-1/2 feet (30 to 45 cm) tall, smooth, decumbent from base. Leaves opposite, elliptical, smooth-edged, not hairy. Flowers white, 1 inch (2.5 cm) wide with 5 notched petals, borne in loose panicles, often drooping. Seed pod enclosed by a thin, inflated, 5-toothed calyx. Seeds blackish, round and flattened, covered with knobs, about 1/16 inch (1.5 mm) in diameter. Found in waste places and fields.