Article

Onobrychis pindicola Hausskn. subsp. urumovii Deg. & Dren. is a Balkan endemie and a glacial relict, rare to Bulgaria. The plant was found self-ineompatible, obligately dependent UpOIl bumblebecs far pollen transport. The bumblebee pollinator aetivity inereased more or less parallelly to the size of population in the studied sites. Aceording to the results of the pollen analysis, O. pindicola subsp. urumovii was the only "major" [or ali bumblcbee speeies colleeted on its tlowers with few exceptions. The recorded high pollinator aetivity indieates that the possible reason for the restrieted number of O. pindicola subsp. urumovii populatiolls oceurring in Bulgaria is not to be conneeted to pollinator limitation.