Calystegia malacophylla

It is endemic to California, where it grows in several of the mountain ranges, including the Central Coast Ranges and the Sierra Nevada.

This is a rhizomatous perennial herb with a woolly stem growing to lengths of 10 centimeters to nearly a meter.

The leaves are vaguely kidney-shaped to triangular and pointed, and reach a few centimeters in length.

The foliage is covered in a short coat of woolly white hairs, giving the plant a light greenish gray color.

The inflorescence holds a solitary white flower which is sometimes tinted with pink or yellow.