I. The genera Pedilanthus and Cubanthus, and other American Euphorbiaceae, by Charles Frederick Millspaugh. II. Two new stonecrops from Guatemala, by Raymond Hamet.

v.2:no.9(1913)

Studies of American plants, by Paul C. Standley.

v.4:no.8(1929)

Additions to our knowledge of the American and Hawaiian floras, by Earl Edward Sherff.

v.22:no.7(1941)

Studies of Central American plants. by Paul C. Standley and Julian A. Steyermark.

v.23:no.3(1944)

The American species of Passifloraceae, by Ellsworth P. Killip.

v.19:pt.2(1938)

Studies of Central American plants. by Paul C. Standley and Julian A. Steyermark.

v.22:no.5(1940)

The North American species of Rumex, by K. H. Rechinger, jr.

v.17:no.1(1937)

Studies of Central American plants. by Paul C. Standley and Julian A. Steyermark.

v.23:no.4(1944)

Contributions to the flora of South America: Studies on Andean Compositae, I. Studies in South American plants, II.

v.27:no.1(1950)

Studies of American plants. by Paul C. Standley.

v.17:no.2(1937)

Revision of the North American species of Xanthium, by Charles Frederick Millspaugh and Earl Edward Sherff.

v.4:no.2(1919)

Studies of Central American plants. by Paul C. Standley and Julian A. Steyermark.

v.23:no.2(1944)

South American plants, by J. Francis Macbride ... also new Euphorbias by C. F. Millspaugh and Canavalias by C. V. Piper.

v.4:no.4(1925)

Studies of Central American plants. by Paul C. Standley and Julian A. Steyermark.

v.23:no.1(1943)