Brotherus (1895) Bih. Kongl. Svenska Vetensk.-Akad. Handl.
Brotherus (1901) Nat. Pflanzenfam.
H. Crum (1997) Contr. Univ. Michigan Herb.
The Global Biodiversity Information Facility:
GBIF Backbone Taxonomy, 2013-07-01.
Accessed via http://www.gbif.org/species/2669077 on 2015-03-06
This backbone name usage exists because it was found in another checklist at the time the backbone was built. The primary source name usage has since been removed from the portal.