Miss H.G.D. (Ike) Zewald was appointed as artist to the Botanical section of Wageningen Agricultural University. She produced drawings for the various publications of the institute, including PhD theses, from the very start of H.C.D. de Wit’s (1909-1999) tenure as professor of botany. The drawing you see here was used in the PhD thesis of B.E.E. de Wilde-Duyfjes.
The crypts pages / Jan D. Bastmeijer. More drawings by Ike Zewald.
A revision of the genus Allium L. (Liliaceae) in Africa / B.E.E. de Wilde-Duyfjes. PhD Thesis. Promotor H.C.D. de Wit. Wageningen: Veenman, 1976. P. 174.
WUR Image Collections. Allium drawings by Ike Zewald.