Heteranthera reniformis Ruiz & Pavon New Weed in Rice Field in the Region of Kocani

Abstract

This paper is about the species Heteranthera reniformis Ruiz & Pavonfound in the rice fields in Kocani-Štip. It is a new adventive species for theflora in Republic of Macedonia. In the text the morphological description of thenew weed from the family Pontederiaceae is given.This species Heteranthera reniformis Ruiz & Pavon for the first time isfound in July 2004 around Kocani, but less spread in rice fields. In August 2005 this weed is found again in locality between village Cesinovo and villageSpancevo left and right from the road. In the rice fields the weed is prevalenton surface about 600 ha and occupied 60-70% from the rice field.