There were 2 illustrations found for H.D.
652965Melampyrum sylvaticum L.
F. Oltmanns, Pflanzenleben Schwarzwaldes: t. 161, fig. 1 (1927) [H.D.]
2 652937 Melampyrum pratense L.F. Oltmanns, Pflanzenleben Schwarzwaldes: t. 161, fig. 2 (1927) [H.D.]
6529652 652937 Melampyrum pratense L.