1. Systematics of the calyptridium umbellatum complex (Portulacaceae)

   • W. Frederick Hinton

   OriginalPaper Pages: 197 - 208

2. The variation and evolution of selected species of solanum section basarthrum

   • Gregory J. Anderson

   OriginalPaper Pages: 209 - 222

3. Stem aerenchyma as a character separating hymenachne and sacciolepis (Gramineae, Panicoideae)

   • Richard W. Pohl
   • Nels R. Lersten

   OriginalPaper Pages: 223 - 227

4. A systematic study of the genus hulsea (Asteraceae)

   • Dieter H. Wilken

   OriginalPaper Pages: 228 - 244

5. Scanning electron microscopy of trichomes of cheilanthes (sinopteridaceae)

   • Irving W. Knobloch
   • H. Paul Rasmussen
   • Wayne S. Johnson

   OriginalPaper Pages: 245 - 250

6. Revision of the genus joosia (rubiaceae)

   • Julian A. Steyermark

   OriginalPaper Pages: 251 - 262

7. Ecogeographic races of Lesquerella engelmannii (cruciferae): Distribution, chromosome numbers, and taxonomy

   • Curtis Clark

   OriginalPaper Pages: 263 - 278

8. Systematic relationships in the narrow-leaved species of chenopodium of the Western United States

   • Daniel J. Crawford

   OriginalPaper Pages: 279 - 288

9. Artificial interspecific hybridization in temperate and tropical species of ruellia (acanthaceae)

   • Robert W. Long

   OriginalPaper Pages: 289 - 296