1. Revision of the genus Adenophorus (Grammitidaceae)

   • L. Earl Bishop

   OriginalPaper Pages: 217 - 240

2. Introgressive hybridization in two southern California species of Rhus (Anacardiaceae)

   • David A. Young

   OriginalPaper Pages: 241 - 255

3. Rocky Mountain species of Paronychia (Caryophyllaceae): A morphological, cytological, and chemical study

   • Ronald L. Hartman

   OriginalPaper Pages: 256 - 263

4. Three new legume species from South America

   • Howard S. Irwin
   • Mary T. Kalin Arroyo

   OriginalPaper Pages: 264 - 270

5. Revision of Richardia (Rubiaceae)

   • Walter H. Lewis
   • Royce L. Oliver

   OriginalPaper Pages: 271 - 301

6. A new Peruvian species of chiropterophilous Couepia (Chrysobalanaceae)

   • Ghillean T. Prance

   OriginalPaper Pages: 302 - 304

7. A new Lewisia (Portulacaceae) from the Sierra Nevada of California

   • L. R. Heckard
   • G. L. Stebbins

   OriginalPaper Pages: 305 - 308

8. Three new species from the Great Basin

   • Noel H. Holmgren
   • Arthur H. Holmgren

   OriginalPaper Pages: 309 - 315

9. The use of neutron activation analysis in pollination ecology

   • Martha M. Gaudreau
   • James W. Hardin

   Research Notes Pages: 316 - 320

10. Notice

    Announcement Pages: 320 - 320