Resumen

SAVEANU, L.  y  MURRAY, M.G.. Flowering phenology of ulmus pumila (ulmaceae) in Bahía Blanca city (Argentina). Polibotánica [online]. 2014, n.38, pp.113-127. ISSN 1405-2768.

Phenology is the study of predictably occurring biological events and their relationship to environmental conditions as light, temperature, humidity, etc. The aims of this study were to describe flowering phenological phases of Ulmus pumila L. in Bahía Blanca city and relate flowering stage with weather data of minimum and maximum temperatures. During two flowering seasons (July to September, 2007 and 2008) phenological observations were carried out weekly in U. pumila plants present in the urban flora. Flowering stage was recorded in July and August, recording the highest flowering on 23 and 7 of August in 2007 and 2008, respectively. During 2007 flowering season, the number of flowers recorded and the open flowering stage duration were higher than 2008. These results help to understand the dynamics of flowering U. pumila in the city of Bahia Blanca; in the long term they will contribute to the understanding of climate change in the region and improve prevention of allergies.

Palabras llave : elms; flowering; temperature; urban flora.