The relationship of clarkias from two continents Peter H. RavenHarlan Lewis OriginalPaper Pages: 193 - 205
Studies on secotiaceous fungi-IV Gastroboletus, Truncocolumella and Chamonixia Alexander H. SmithRolf Singer OriginalPaper Pages: 205 - 223
Studies on secotiaceous fungi-V. Nivatogastrium gen. Nov. Rolf SingerAlexander H. Smith OriginalPaper Pages: 224 - 228
Studies in saxifragaceae-II. Saxifraga sect. trachyphyllum in North America J. A. CalderD. B. O. Savile OriginalPaper Pages: 228 - 249
Natural hybridization between silphium laciniatum and silphium terebinthinaceum T. Richard Fisher OriginalPaper Pages: 250 - 254
A new species of cyperus from the illinois sand prairies Robert H. Mohlenbrock OriginalPaper Pages: 255 - 256