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Sable Island, with a catalogue of its vascular plants
Iss 62, Page 1, Date 1921
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The Gray Herbarium expedition to Nova Scotia, 1920
Iss 63, Page 89, Date 1922
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Records preliminary to a general treatment of the Eupatorieae,--I
Iss 64, Page 3, Date 1922
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The Mikanias of northern and western South America
Iss 64, Page 21, Date 1922
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The group of Polypodium lanceolatum in North America
Iss 65, Page 3, Date 1922
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Notes on certain Leguminosae of the tribe Psoraleae
Iss 65, Page 14, Date 1922
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Dyscritothamnus, a new genus of Compositae
Iss 65, Page 24, Date 1922
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A revision of Astragalus, subgenus Homalobus, in the Rocky Mountains
Iss 65, Page 28, Date 1922
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Various North American Spermatophytes, new or transferred
Iss 65, Page 39, Date 1922
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Records preliminary to a general treatment of theEupatorieae,--ii
Iss 65, Page 46, Date 1922
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Polypodium virginianum and P. vulgare
Iss 66, Page 125, Date 1922
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Notes on the flora of western Nova Scotia, 1921
Iss 67, Page 157, Date 1922
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Records preliminary to a general treatment of the Eupatorieae,--III
Iss 68, Page 3, Date 1923
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Studies in the Boraginaceae
Iss 68, Page 43, Date 1923
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Diagnoses and notes relating to the Spermatophytes chiefly of North America
Iss 68, Page 80, Date 1923
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Revision of the American species of Hypoxis
Iss 69, Page 120, Date 1923
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Some genera closely related to Hypoxis
Iss 69, Page 155, Date 1923
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Index [no. 51-75]
Iss 75, Page 1, Date 1925