It is only found from the western end of Simi Hills along the Montclef Ridge to the Conejo Grade in Newbury Park.

[3][4][5] This species of Dudleya is an especially unique taxa, as it possesses several characteristics intermediate within the genus.

It was thought that Dudleya and Hasseanthus were the most distant from each other, and that Stylophyllum occupied an intermediate space.

The leaves are deciduous in summer, and are 1.5 to 4 cm long, 3 to 6 mm wide, and shaped oblanceolate, glaucous in youth, but papery when dry.

The population boundaries exhibits some annual fluctuations, but otherwise it has remained in the same suitable habitat area for some time.

The rugged terrain makes tracking populations difficult, along with the summer deciduous habit.

[6] It is typically found on north-facing cliffs of the Conejo volcanics, and on the adjacent grassland.