See text Sadleria is a genus of six species of ferns in the family Blechnaceae, all endemic to Hawaii.

Georg Friedrich Kaulfuss distinguished the genus in 1824 based on samples of S. cyatheoides acquired by Adelbert von Chamisso in 1821.

Chamisso had been serving as the naturalist for a Russian scientific expedition led by Otto von Kotzebue aboard the vessel Rurick.

[2] Kaulfuss named the genus after Joseph Sadler (1791–1849), a Hungarian naturalist who studied European ferns.

[2] As of December 2019[update], the Checklist of Ferns and Lycophytes of the World accepted the following species:[3] The Halemaʻumaʻu crater on Kīlauea is named after S. cyatheoides.