A review of the taxonomy of hawaiian pipturus (urticaceae) by anatomical and cytological evidence Swat NicharatGeorge W. Gillett OriginalPaper 01 October 1970 Pages: 191 - 206
The evolutionary implications of interspecific hybridization among four species of zinnia sect. Mendezia (compositae) Omotoye Olorode OriginalPaper 01 October 1970 Pages: 207 - 216
The phylogeny of gutierrezia: An eclectic approach Otto T. Solbrig OriginalPaper 01 October 1970 Pages: 217 - 229
Cuticular terminology in Russula (agaricales) Robert L. Shaffer OriginalPaper 01 October 1970 Pages: 230 - 239
Chromosome numbers of dominican compositae Andrew M. TorresAlain H. Liogier OriginalPaper 01 October 1970 Pages: 240 - 245
A revision of tabebuia (bignoniaceae) in Central America Alwyn H. Gentry OriginalPaper 01 October 1970 Pages: 246 - 264
New taxa and nomenclatural changes in arceuthobium (viscaceae) Frank G. HawksworthDelbert Wiens OriginalPaper 01 October 1970 Pages: 265 - 269
The systematics of clarkia bottae, C. Cylindrica, and a related new species, C. Rostrata W. S. Davis OriginalPaper 01 October 1970 Pages: 270 - 284
Announcement of graduate courses in tropical science in 1971 Announcement 01 October 1970 Pages: 287 - 287
Erratum to: Two new species of phacelia (Hydrophyllaceae) from California Lincoln ConstanceLawrence R. Heckard Erratum 01 October 1970 Pages: 288 - 288
Taxonomy of barkeria (Orchidaceae) L. B. ThienR. L. Dressler OriginalPaper 01 October 1970 Pages: 289 - 302
A new species of besleria (Gesneriaceae) from Venezuela Julian A. Steyermark OriginalPaper 01 October 1970 Pages: 303 - 304
Variation among tripsacum populations of Mexico and Guatemala L. F. Randolph OriginalPaper 01 October 1970 Pages: 305 - 337
Ptelea trifoliata ssp. trifoliata (Rutaceae) in deciduous forest regions of Eastern North America Virginia L. BaileyShirley B. HerlinHarold E. Bailey OriginalPaper 01 October 1970 Pages: 346 - 358
Artificial hybridization of the genera zinnia (Sect. Mendezia) and tragoceras (Compositae-Zinninae) Omotoye OlorodeAndrew M. Torres OriginalPaper 01 October 1970 Pages: 359 - 369