Published in Annals of the Missouri Botanical Garden, in 1994, in volume 81, pages 160-179

Created: 2010-01-08, modified: 2015-12-16

Published in Berichte der Deutschen Botanischen Gesellschaft, in 1919, in volume 37, pages 83-96

Created: 2017-10-18, modified: 2017-10-18

Published in Muelleria, in 2002, in volume 16, pages 65-70

Created: 2018-01-28, modified: 2023-02-16