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Notes and References
This item contains 4 references.
1Bull. Torr. Bot. Club14: 45. 1887.
2Rep. Ill. Geol. Surv.4: 220. 1870.
3Rep. Ill. Geol. Surv.4: 233. 1870.
4Synoptical Flora of N. America, 1": 231. 1897.