More Beautiful Lithops Stamps

As if collecting Lithops wasn't eccentric enough, now I'm collecting stamps of Lithops. Good grief....

These lovely stamps hail from Benin. They were issued August 30, 1997, and are part of a set of six. I cannot find the name of the artist. From the left, we have Lithops fulviceps, Lithops helmutii, and Lithops aucampiae, all in bloom.

The other three in the set show a Stapelia, a Faucaria, and a Conophytum. If you know more about the history of the set, or who created the lithographs, leave a comment!