1873. Notes on Compositæ and characters of certain genera and species, etc. VIII. 631-661.
1874. Notes on Compositæ and characters of certain genera and species. IX. 187-218.
1874. A synopsis of the North American Thistles; notes on Borraginaceæ; synopsis of North American species of Physalis; characters of various new species. X. 39-78.
1875. A conspectus of the North American Hydrophyllaceæ. X. 312-332.
1876. Characters of Canbya (n. gen.) and Arctomecon; characters of new species. With two plates. XII. 51-84.
1879. Characters of some new species of Compositæ from Mexico; some new North American genera, species, etc. XV. 25-52.
1880. Notes on some Compositæ; some species of Asclepias; a new genus of Gentianaceæ; miscellanea of the North American flora. XVI. 78-108.
1882. Studies of Aster and Solidago in the older Herbaria; Novitiæ Arizonicæ, etc. XVII. 163-230.
1883. Characters of new Compositæ with revisions of certain genera and critical notes; miscellaneous genera and species. XIX. 1-96.
1885. A revision of some Borragineous genera; notes on some American species of Utricularia; new genera of Arizona, California, and their Mexican borders, and two additional species of Asclepiadaceæ; Gamopetalæ Miscellaneæ. XX. 257-310.