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A botanical expedition to Newfoundland and southern Labrador
Iss 40, Page 109, Date 1911
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A redisposition of the species heretofore referred to Leptosyne
Iss 41, Page 335, Date 1913
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A revision of Encelia and some related genera
Iss 41, Page 346, Date 1913
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A generic key to the Compositae-Eupatorieae
Iss 42, Page 429, Date 1913
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Revisions of Alomia, Ageratum, and Oxylobus
Iss 42, Page 438, Date 1913
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Some new combinations required by the international rules
Iss 42, Page 492, Date 1913
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On the Gramineae collected by Prof. Morton E. Peck in British Honduras, 1905-07
Iss 42, Page 493, Date 1913
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Diagnoses and transfers among the Spermatophytes
Iss 42, Page 502, Date 1913
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Some new or unrecorded Compositae chiefly of northeastern America
Iss 43, Page 1, Date 1915
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Some anomalous species and varieties of Bidens in eastern North America
Iss 43, Page 20, Date 1915
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An insular variety of Solidago sempervirens
Iss 43, Page 26, Date 1915
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The genus Euphrasia in North America
Iss 44, Page 181, Date 1915
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Compositae new and transferred, chiefly Mexican
Iss 45, Page 515, Date 1916
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New, reclassified, or otherwise noteworthy Spermatophytes
Iss 45, Page 527, Date 1916
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Certain Borraginaceae, new or transferred
Iss 45, Page 541, Date 1916
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The genus Puccinellia in eastern North America
Iss 46, Page 1, Date 1916
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A revision of the genus Polygala in Mexico, Central America, and the West Indies
Iss 47, Page 1, Date 1916
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The true Mertensias of western North America
Iss 48, Page 1, Date 1916
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Revision of the genus Oreocarya
Iss 48, Page 20, Date 1916
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Notes on certain Borraginaceae
Iss 48, Page 39, Date 1916
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A revision of the North American species of Amsinckia
Iss 49, Page 1, Date 1917
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Further notes on the Boraginaceae
Iss 49, Page 16, Date 1917
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Notes on the Hydrophyllaceae and a few other North American Spermatophytes
Iss 49, Page 23, Date 1917
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New or otherwise interesting plants from Idaho
Iss 49, Page 60, Date 1917
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A revision of the Erigerons of the series Multifidi
Iss 49, Page 72, Date 1917
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Index [no. 26-50]
Iss 50, Page 1, Date 1917
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Some Polygonums new to North America
Iss 50, Page 133, Date 1917
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New or critical species or varieties of Ranunculus
Iss 50, Page 135, Date 1917
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Some color forms of American Anemones
Iss 50, Page 139, Date 1917
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New species, varieties and forms of Saxifraga
Iss 50, Page 141, Date 1917
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A new Vitis from New England
Iss 50, Page 144, Date 1917
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Gentiana clausa a valid species
Iss 50, Page 147, Date 1917
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Some forms of American Gentians
Iss 50, Page 149, Date 1917
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Some new or critical plants of eastern North America
Iss 50, Page 152, Date 1917