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Becker, K . M . 1976. A new species of Erigeron (Asteraceae) from Alaska and Yukon. Bri t tonia 28: 144-146. Boivin, B. 1972. Flora of the prairie provinces. Phytologia 23: 1-140. Cronquist , A. 1947. Revision of the Nor th American species of Erigeron, north of Mexico. Bri t tonia 6: 121-302. Nesom, G. L. 1976. A new species of Erigeron (Asteraceae) and its relatives in southwestern Utah. Brit tonia 28: 263-272. Shinners, L. H. 1947. Two anomalous new species ot Erigeron L. from Texas. Wright ia 1: 183-186. Spongherg, S. A. 1973. A new Alaskan species of Erigeron L. (Composi tae) . Rhodora 75: 116-119. Turner , B. L. 1975. Two new gypsophilic species of Erigeron (Asteraceae) from nor thern Mexico. Wrightia 5: 116-119. Welsh, S. L. & G. Moore. 1968. Plants of Natura l Bridges National Monument . Proc. Utah Acad. Sci. 45: 220-248.

Botanical Beachcombers and Explorers: Pioneers of the 19th Century in the Upper Great Lakes.