There were 2 illustrations found for Ownbey
6 29389 Ageratum corymbosum ZuccagniAnn. Missouri Bot. Gard., vol. 58 : p. 65, t. 12 (1971) [Ownbey & Muggley]
6 449666 Galinsoga quadriradiata Ruiz & PavonAnn. Missouri Bot. Gard., vol. 58 : p. 81, t. 18 (1971) [Ownbey & Muggley]