Gibbaeum nebrownii var. johnstonii (van Jaarsv. & S.A.Hammer) P.Pavelka in Astridia 3: 39. 1998.

Nomenclatural References

• person : Ernst Jacobus van Jaarsveld (b.1953) Based on occurrence of standard abbreviation 'van Jaarsv.' in the authors string.
• person : Steven Allen Hammer (b.1951) Based on occurrence of standard abbreviation 'S.A.Hammer' in the authors string.