Flax-leaf Fleabane

Conyza bonariensis horse weed. Derivation of the botanical name:
Conyza, konops (Greek), "a gnat", and used by Pliny as a name for some kind of a fleabane, or konis (Greek), "dust", its powder being used to kill fleas. Source of information from: http://www.flowersinisrael.com/Conyzabonariensis_page.htm.

Thanks to efloraindi​a group members for identification of this plant.