Stockholm, Isaac Marcus, 1907. 8vo (27.0 x 18.8 cm). 187 pp.;13 double-paged lithographed plates (eight in full colour). Original printed wrappers.

A detailed study on the variability of the twinflower, a variable, Arctic flower which was a favourite of Linnaeus, and after whom the genus was named. Written by the Swedish botanist Veit Brecher Wittrock (1839-1914) and published as Acta Horti Bergiani 4(7). Dedicated and signed by the author on the front cover. Bookblock broken; wrappers detached and chipped at edges, otherwise (text, plates) very good. The plates are quite beautiful. Stafleu & Cowan, 18133.