1. A review of the taxonomy of hawaiian pipturus (urticaceae) by anatomical and cytological evidence

   • Swat Nicharat
   • George W. Gillett

   OriginalPaper 01 October 1970 Pages: 191 - 206

2. The evolutionary implications of interspecific hybridization among four species of zinnia sect. Mendezia (compositae)

   • Omotoye Olorode

   OriginalPaper 01 October 1970 Pages: 207 - 216

3. The phylogeny of gutierrezia: An eclectic approach

   • Otto T. Solbrig

   OriginalPaper 01 October 1970 Pages: 217 - 229

4. Cuticular terminology in Russula (agaricales)

   • Robert L. Shaffer

   OriginalPaper 01 October 1970 Pages: 230 - 239

5. Chromosome numbers of dominican compositae

   • Andrew M. Torres
   • Alain H. Liogier

   OriginalPaper 01 October 1970 Pages: 240 - 245

6. A revision of tabebuia (bignoniaceae) in Central America

   • Alwyn H. Gentry

   OriginalPaper 01 October 1970 Pages: 246 - 264

7. New taxa and nomenclatural changes in arceuthobium (viscaceae)

   • Frank G. Hawksworth
   • Delbert Wiens

   OriginalPaper 01 October 1970 Pages: 265 - 269

8. The systematics of clarkia bottae, C. Cylindrica, and a related new species, C. Rostrata

   • W. S. Davis

   OriginalPaper 01 October 1970 Pages: 270 - 284

9. Announcement of graduate courses in tropical science in 1971

   Announcement 01 October 1970 Pages: 287 - 287

10. Erratum to: Two new species of phacelia (Hydrophyllaceae) from California

    • Lincoln Constance
    • Lawrence R. Heckard

    Erratum 01 October 1970 Pages: 288 - 288

11. Taxonomy of barkeria (Orchidaceae)

    • L. B. Thien
    • R. L. Dressler

    OriginalPaper 01 October 1970 Pages: 289 - 302

12. A new species of besleria (Gesneriaceae) from Venezuela

    • Julian A. Steyermark

    OriginalPaper 01 October 1970 Pages: 303 - 304

13. Variation among tripsacum populations of Mexico and Guatemala

    • L. F. Randolph

    OriginalPaper 01 October 1970 Pages: 305 - 337

14. Novelties in Hedeoma (Labiatae)

    • Robert S. Irving

    OriginalPaper 01 October 1970 Pages: 338 - 345

15. Ptelea trifoliata ssp. trifoliata (Rutaceae) in deciduous forest regions of Eastern North America

    • Virginia L. Bailey
    • Shirley B. Herlin
    • Harold E. Bailey

    OriginalPaper 01 October 1970 Pages: 346 - 358

16. Artificial hybridization of the genera zinnia (Sect. Mendezia) and tragoceras (Compositae-Zinninae)

    • Omotoye Olorode
    • Andrew M. Torres

    OriginalPaper 01 October 1970 Pages: 359 - 369