Name: Frederik Marcus,Frederik Marcus Surname: Knuth,Knuth-Knuthenborg Born: 1904-1970 Group S
his person is also author of following taxa:
Cylindropuntia echinocarpa (Engelm. & J. M. Bigelow) F. M. Knuth
Cylindropuntia imbricata (Haw.) F. M. Knuth