NIGHT-FLOWERING CATCHFLY, Silene noctiflora L. 1, plant in bloom; 2, flower; 3, seed pod; 4, seed; 5, seedling. Annual, reproducing by seed. Stems 1 to 3 feet (30 to 90 cm) high, erect, densely covered with sticky hairs. Leaves oblong, 2 to 5 inches (5 to 12.5 cm) long, smooth-edged. Flowers white, shading into pink, about 3/4 inch (1.9 cm) across with 5 petals. Seed pod enclosed by calyx with 5 teeth. Seeds rounded, 1/16 inch (1.5 mm) in diameter, gray, with knobs covering surface. Seed is common impurity in clover seed. Found in fields and waste places.