Silene undulata, commonly known as campion or wild tobacco, is a perennial reaching heights ranging between 15 cm and 80 cm. The plant is sticky, covered in gland-tipped hairs. Its leaves are opposite and variably shaped with entire margins: those at the base are spoon-shaped, up to 15 cm long, while smaller lance-shaped ones occurring up the stems become 8 cm.
The white or pink flowers have long calyx tubes and stalked petals that spread at the mouth. The five petals are two-lobed, attached halfway up their length. The lobe tips broaden to rounded or nearly square shapes, the petal margins at the lobe tips often more or less notched.
Flowers open mostly at night when they are fragrant. The plant grows on slopes and flats, widespread in southern and tropical Africa. This one was photographed at Caledon in November (Manning, 2007; www.plantzafrica.com).