A REVISION OF THE VERNAL SPECIES OF HELENIUM (COMPOSITAE) (continued)
Rock, Howard F L
Article
1957
Rhodora
59
168--178
BioStor
[Cambridge, Mass., etc.], New England Botanical Club [etc.],
BioStor: https://biostor.org/reference/180536
In copyright. Digitized with the permission of the rights holder.
https://biodiversitylibrary.org/permissions
http://creativecommons.org/licenses/by-nc-sa/3.0/
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