1. News and notes

   News Pages: XVI - XVI

2. The lomatium dasycarpum—mohavense—foeniculaceum complex (Umbelliferae)

   • William L. Theobald

   OriginalPaper Pages: 1 - 18

3. Once more: The orchid-flowered butterworts

   • S. Jost Casper

   OriginalPaper Pages: 19 - 28

4. 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

5. Chromosome numbers in Claytonia

   • Ray J. Dayis
   • Richard G. Bowmer

   OriginalPaper Pages: 37 - 38

6. Experimental hybridizations in Vernonia (Compositae)

   • Samuel B. Jones

   OriginalPaper Pages: 39 - 44

7. Acacia brevispica and acacia schweinfurthii in Africa, with particular reference to natal

   • J. H. Ross
   • Kathleen D. Gordon-Gray

   OriginalPaper Pages: 44 - 63

8. Biosystematics of the helianthus nuttallii complex (Compositae)

   • Robert W. Long

   OriginalPaper Pages: 64 - 79

9. A redefinition of penstemon (Scrophulariaceae)

   • Richard M. Straw

   OriginalPaper Pages: 80 - 95

10. A new species of porophyllum (Compositae : helenieae) from Mexico

    • R. Roy Johnson

    OriginalPaper Pages: 96 - 96