A REVISION OF THE VERNAL SPECIES OF HELENIUM (COMPOSITAE) (Continued)
Rock, Howard F L
Article
1957
Rhodora
59
128--158
BioStor
[Cambridge, Mass., etc.], New England Botanical Club [etc.],
BioStor: https://biostor.org/reference/180547
In copyright. Digitized with the permission of the rights holder.
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http://creativecommons.org/licenses/by-nc-sa/3.0/
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