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| | List of authors |
 | | Cirsium lanceolatum, C. altissimum, C. discolor, C. virginianum, C. pitcheri, C. undulatum, C. plattense, C. flodmani, C. ochrocentrum, C. nebraskense, C. odoratum, C. hillii, C. horridulum, C. muticum, C. arvense, C. palustre. |
 | | A clarification of Cirsium foliosum and Cirsium drummondii. |
 | | Cytotaxonomy of Cirsium muticum, Cirsium discolor, and Cirsium altissimum. |
| www.largocanyon.org /science/cirsium/refinfo/authors.htm (1812 words) |
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