Author: White, Alain & B.L.Sloane.
Title: The Stapelieae. Volume II.
Description: Pasadena, 1937. p. 409-818, 23 pp. 478 b./w. ills. & 22 col. plts. Hardcover, stained. Pages sl. foxed.Only volume 2 of 3.

Keywords: Cactus Cactussen