1. Revision of the genus Ptelea (rutaceae)

   • Virginia Long Bailey

   OriginalPaper Pages: 1 - 45

2. Some dicotyledonous plants recently collected in the Hawaiian Islands

   • Earl Edward Sherff

   Erratum Pages: 45 - 45

3. Lopezia langmanae and the genus Jehlia

   • Faustino Miranda

   OriginalPaper Pages: 46 - 46

4. A new grass from new guinea

   • N. L. Bor

   OriginalPaper Pages: 48 - 49

5. Studies in South American plants-VI

   • Jose Cuatrecasas

   OriginalPaper Pages: 50 - 57

6. Claims for missing numbers

   • Richard W. Pohl

   Announcement Pages: 57 - 57

7. Payment of dues in U. S. currency

   Announcement Pages: 57 - 57

8. Observations on Pseudobryopsis and Trichosolen (chlorophyceae-bryopsidaceae) in America

   • Wm. Randolph Taylor

   OriginalPaper Pages: 58 - 65

9. Monograph of Rosa in North America. IV. R. xdulcissima

   • Walter H. Lewis

   OriginalPaper Pages: 65 - 71

10. The North American mesquites Prosopis Sect. Algarobia (Leguminosae)

    • Marshall C. Johnston

    OriginalPaper Pages: 72 - 89

11. Dryopteris in the Huron mountain club area of Michigan

    • W. H. Wagner
    • Dale J. Hagenah

    OriginalPaper Pages: 90 - 100

12. Taxonomy of hymenothrix (Helenieae, Compositae)

    • B. L. Turner

    OriginalPaper Pages: 101 - 120

13. Rediscovery of the wall-rue in Michigan

    • Jarl K. Hiltunen

    OriginalPaper Pages: 120 - 120

14. Segregate genera of the Lepidozia complex (Hepaticae) Part 3. Microlepidozia Jörg. and Micrisophylla gen. Nov.

    • Margaret Fulford

    OriginalPaper Pages: 121 - 136

15. The Rachel McMasters Miller Hunt botanical library

    • H. W. Rickett

    OriginalPaper Pages: 136 - 136