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Rydberg, P. A. Studies on the Rocky Mountain flora. I. Bull. 

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Rydberg, P. A. The oaks of the Continental Divide north of 

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Rydberg, P. A. Astragalus and its segregates as represented 

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Rydberg, P. A., and Shear, C. L. A report upon the grasses 

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Sudworth, G. B. Forest flora of the Rocky Mountains. Bull. 2, 

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Thacher, Mrs. G. W. Alpine flowers of Colorado. Appalachia, 

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Torrey, John, and Gray, Asa. (A botanical report of plants 

 collected by Mr. F. Crentzf eldt) . Pacific Railroad report, 2, 125- 

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Vasey, George. Report on grasses of Kansas, Nebraska, and 

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