The snowdrop (and a crocus).London: printed; for the publisher; by T. Bensley; Bolt Court; Fleet Street; [1799-]1807.From: Robert John Thornton; New illustration of the sexual system of Carolus von Linnaeus: comprehending an elucidation of the several parts of the fructification; a prize dissertation on the sexes of plants; a full explanation of the classes; and orders; of the sexual system; and the Temple of Flora; or Garden of nature; being picturesque; botanical; coloured plates; of select plants; illustrative of the same; with descriptions.10. Tab. 40London; British Library.