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World Checklist of Selected Plant Families (WCSP)

Caralluma langii A.C.White & B.Sloane, Stapelieae: 61 (1933).

Original Compiler: R.Govaerts
This name is not Accepted by:

Govaerts, R. (1999). World Checklist of Seed Plants 3(1, 2a & 2b): 1-1532. MIM, Deurne. [as Orbeopsis knobelii]

Albers, F. & Meve, U. (eds.) (2002). Illustrated handbook of succulent plants Asclepiadaceae , corr. 2nd printing: 1-318. Springer, Berlin, Heidelberg,New York. [as Orbea knobelii]