Contributions from the Gray Herbarium of Harvard University: The North American Alsineæ; Descriptions of New and Hitherto Imperfectly Known Plants Collected in Mexico by C. G. Pringle in 1892 and 1893; Notes upon the Genus Galinsoga; Miscellaneous Notes and New Species
B. L. Robinson. "Contributions from the Gray Herbarium of Harvard University: The North American Alsineæ; Descriptions of New and Hitherto Imperfectly Known Plants Collected in Mexico by C. G. Pringle in 1892 and 1893; Notes upon the Genus Galinsoga; Miscellaneous Notes and New Species." Proceedings of the American Academy of Arts and Sciences (1893) 273