The petal tube is lilac-coloured, white with yellow-brown spots inside. The outer surface of the tube and both surfaces of the lobes are glabrous but the inside of the tube is filled with long, soft hairs. The 4 stamens are fully enclosed in the petal tube.
The petal tube has a distinctive appearance, being lilac-coloured on the outside, white with yellow-brown spots inside. The surface of the tube and the lobes' surfaces are smooth, but the interior is covered in long, soft hairs. The 4 stamens are fully enclosed within the petal tube.