| Title | Spring Flora of Wisconsin: a manual of Plants Growing without Cultivation and Flowering before June 15. 4th Edition. Madison, WI |
| Abbreviation | Spring Fl. Wisconsin (ed. 4) |
| Authors | N. C. Fassett |
| Publication Dates | 1976 |
| Remarks | Revised and enlarged by Olive S. Thomson; additional illustrations by Roderick L. Thomson; text for Cyperaceae by James Zimmerman and illustrations by Elizabeth Hollister Zimmerman |
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