I read this post yesterday and worried about how best to respond. It shows "solved" today - but I am still worried-
In Colorado, there are over 20 genus and over 40 species growing wild (doesn't include domestic things growing wild in cultivated gardens). And in Colorado, two of them are forms of Hemlock - arguably the most poisonous plant in North America.
You can't afford any mistakes on identification! Any doubt, treat it like Hemlock. You don't have to swallow Hemlock to be poisoned, there has been accidental poisoning of children who used the hollow stems for whistles or "pea-shooters". And the way I understand it, if a lethal dose has been taken, it is irreversible, even in a hospital.
I can send you the ID key for Colorado (3-4 pages), or just the characteristics of Hemlock from the key, but I am not sure it would apply in Israel.
Post Script - I forgot to mention, even the edible kind can cause contact dermatitis in sensitive individuals.
I'm not the OP, but I'd love to see the key. I have Conium maculata that reseeds in my yard, but it's unsurprisingly more spotted than this on the stems, even when it first germinates or sprouts for the second year of growth.