Vol. 80, No. 1: 37-48 , 2011 ACTA SOCIETATIS BOTANICORUM POLONIAE 37 THE DISTRIBUTION AND HABITAT REQUIREMENTS OF THE GENUS OROBANCHE L. (OROBANCHACEAE) IN SE POLAND RENATA PIWOWARCZYK 1, P IOTR CHMIELEWSKI 2, A NNA CWENER 3 1 Department of Botany, Institute of Biology, Jan Kochanowski University Świętokrzyska 15, 25-406 Kielce, Poland e-mail:
[email protected] 2 Zamość Nature Society Partyzantów 74/59, 22-400 Zamość, Poland 3 Department of Geobotany, Institute of Biology, Maria Curie-Skłodowska University Akademicka 19, 20-033 Lublin, Poland (Received: March 11, 2010. Accepted: October 10, 2010) ABSTRACT The distribution of the genus Orobanche in SE Poland is presented. The study area stretches between the Vistula and the Bug rivers , and comprises the Polish areas of the Lublin-Lwów Upland , the Wołyń Upland and the southern part of Polesie. Eight species of the genus Orobanche : O. alba , O. alsatica , O. arenaria , O. caryophyllacea , O. elatior , O. lutea , O. pallidiflora , O. picridis , were collected during floristic investigations conducted between 1999 and 2010. The hosts , abundance and habitat preferences at the localities are given and a supplemented map of the distribution in SE Poland is included. KEY WORDS: Orobanche , distribution, habitat preferences, host, Lublin-Lwów Upland, Wołyń- -Podole Upland, SE Poland. INTRODUCTION Polish red data book of plants (Zarzycki and Kaźmiercza- kowa 2001). The genus Orobanche L. belonging to the family In Poland , the taxa are mostly concentrated in the range Orobanchaceae contains species lacking chlorophyll that of xerothermic habitats in the belt of Polish uplands: Śląsk- are holoparasites of other vascular plants. It is one of the Kraków Upland , Małopolska Upland , south-eastern most critical genera of the flora in Poland and worldwide , uplands , as well as in the lower Oder valley and the Vistula and is notoriously difficult to determine , especially when valley (Zając and Zając 2001).