Tephroseris longifolia agg. is a complex group of outcrossing perennials distributed throughout Central Europe. Recent morphological study revealed six morphotypes corresponding to five previously distinguished subspecies, together with Alpine and Pannonian morphotypes of T. longifolia subsp. longifolia. The delimited morphotypes differ in relative DNA content, geographical range, and rarity. W...

A new species and a new record for Chionolaena are recorded from Sierra Nevada de Santa Marta, Colombia adding to the two species of the genus already known from that mountain complex.

The duration of phases of the cell cycle are measured in five species and one hybrid of the genus Crepis (Compositae), after pulse labeling with tritiated thymidine. The results indicate significant variations in the duration of post-synthetic interphase (G(2)), which affords a possible explanation for the abnormal chromosome morphology first described in Crepis hybrids as neutral amphiplasty.

1Institut für Biologie-Botanik, Dahlem Centre of Plant Sciences, Freie Universität Berlin, Altensteinstrasse 6, 14195 Berlin, Germany 2Department of Evolution, Ecology & Organismal Biology, Ohio State University, Columbus, OH 43210, USA 3Calle Guaidil No. 16, CP 38280, Tegueste, Tenerife, Islas Canarias, Spain 4Department of Integrative Biology, University of Texas at Austin, 1 University Stati...

Pollen is used in the human diet as a food supplement because of its high nutritional value; however, this product is prone to fungal contamination that could potentially generate toxins that are harmful to human health. This study aimed to verify the floral diversity of commercial brands of bee pollen and their mycotoxicological safety for human consumption. A total of 27 bee pollen samples we...