Flower:

Flowers are in a rounded flat cluster about 3 inches across at the top of the stem. Each flower is about 1 inch across with 5 pale blue to blue-violet petals fused at the base, forming a tube, and has a hairy bract. The petals are narrow at the base; the tip end is wider and round or slightly indented, but not notched. Flowers are occasionally white. A plant usually has 1 cluster, but may branch at the top of the plant and have more than 1.

Leaves and stem:

Leaves are slightly different between fertile (flowering) plants and infertile plants. On fertile plants, leaves are 1 to 2 inches long and to ½ inch across with a rounded base, tapering to a blunt or pointed tip, and no leaf stem. Leaves are finely hairy, with short fine hairs along the toothless edges, and are widely spaced along the stem. Attachment is opposite. The main stem is more or less hairy, and may be somewhat sticky. On infertile plants, the leaves may be wider and rounded at the tip end, and less hairy overall.