Published in Journal für Ornithologie, in 1857, in volume 5, pages 385-399

Created: 2014-09-04, modified: 2014-09-04

Published in Gartenflora, in 1885, in volume 34, pages 3-9

Created: 2016-10-02, modified: 2016-10-02

Published in Hedwigia, in 1906, in volume 45, issue 4, pages 215-238

Created: 2016-03-25, modified: 2016-03-25