Bonamia menziesii, commonly known as Hawaiʻi lady's nightcap, is a species of flowering plant in the morning glory family, Convolvulaceae, that is endemic to Hawaii.

Scattered populations exist on most main islands, but the total number of individuals remaining is probably fewer than 1000.

[3] Habitat has been destroyed or degraded by development, fires, exotic plant species, and agriculture.

[4] Feral pigs, goats, cattle, sheep and deer eat the plant and trample the habitat.

[4] The non-native sweet potato bug (Physomerus grossipes) has been noted to feed on the plant.