The lomatium dasycarpum—mohavense—foeniculaceum complex (Umbelliferae) William L. Theobald OriginalPaper Pages: 1 - 18
Notes on the ragweeds of south America with the description of two new species: Ambrosia Pannosa and A. Parvifolia (Compositae) Willaed W. Payne OriginalPaper Pages: 28 - 37
Acacia brevispica and acacia schweinfurthii in Africa, with particular reference to natal J. H. RossKathleen D. Gordon-Gray OriginalPaper Pages: 44 - 63
Biosystematics of the helianthus nuttallii complex (Compositae) Robert W. Long OriginalPaper Pages: 64 - 79
A new species of porophyllum (Compositae : helenieae) from Mexico R. Roy Johnson OriginalPaper Pages: 96 - 96