Systematics of the calyptridium umbellatum complex (Portulacaceae) W. Frederick Hinton OriginalPaper Pages: 197 - 208
The variation and evolution of selected species of solanum section basarthrum Gregory J. Anderson OriginalPaper Pages: 209 - 222
Stem aerenchyma as a character separating hymenachne and sacciolepis (Gramineae, Panicoideae) Richard W. PohlNels R. Lersten OriginalPaper Pages: 223 - 227
Scanning electron microscopy of trichomes of cheilanthes (sinopteridaceae) Irving W. KnoblochH. Paul RasmussenWayne S. Johnson OriginalPaper Pages: 245 - 250
Ecogeographic races of Lesquerella engelmannii (cruciferae): Distribution, chromosome numbers, and taxonomy Curtis Clark OriginalPaper Pages: 263 - 278
Systematic relationships in the narrow-leaved species of chenopodium of the Western United States Daniel J. Crawford OriginalPaper Pages: 279 - 288
Artificial interspecific hybridization in temperate and tropical species of ruellia (acanthaceae) Robert W. Long OriginalPaper Pages: 289 - 296