From "Flora Graeca Sibthorpiana", by J.E. Smith, Vol. 6, 1828, Pl. 516: a. Flos absque petalis. b. Petalum e parte internâ
The plate was already prepared by J. Sibthorp before his death in 1796 and referred to in Vol. I of "Flora Graecia Prodromus" (1806).
Courtesy of Biodiversity Heritage Library