Chromosome numbers of eleven angiosperm species, five dicots and six monocots from Georgia and Azerbaijan are reported. The chromosome number of Cruciata coronata (Rubiaceae) is provided for the first time (2n = 22). Additionally, karyotypes are presented for five species, those of Danae racemosa (Ruscaceae), Paris incompleta (Trilliaceae), and Ruscus hyrcanus (Ruscaceae) for the first time. Th...

As part of a biosystematic study of the Lentinellus ursinus species complex in eastern North America, field and herbarium specimens from North America, Central America, and Europe were examined. Crossing single basidiospore isolates demonstrated tetrapolar (bifactorial) mating systems. Three biological species are recognized as L. ursinus, L. angustifolius, and L. vulpinus. The production of gl...

Cytological and chromatographic data indicate that Silphium integrifolium Michx. is a rather homogeneous group of plants. Cytological study shows good pairing during meiosis in interspecific and intraspecific hybrids. Two-dimensional paper chromatography indicates that the varieties of S. integrifolium are more similar to each other than they are to two related species, S. asperrimum and 5. spe...