Family, Primrose. Color, yellow. Calyx and corolla united below, deeply 5-parted above, the divisions spreading. Flowers, on long, filiform peduncles, grouped with small leaves, axillary, opposite. Leaves, opposite, often so close together as to seem whorled, ovate or oblong, sharply pointed at apex, rounded or inclined to be heart-shaped at base, all on long, hairy-fringed petioles, their margins slightly fringed. June to August.