Nuttall's Great Plains species of Cirsium: C. undulatum and C. canescens
Ownbey, Gerald B., 1916-
Article
1952
Rhodora
54
29--35
BioStor
[Cambridge, Mass., etc.], New England Botanical Club [etc.],
BioStor: https://biostor.org/reference/139360
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http://creativecommons.org/licenses/by-nc-sa/3.0/
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