Maltawildplants.com is now considered an online flora of the Maltese islands, portraying more than 900 species of plants found in Maltese habitats. It harbours a forum created in 2005 were memberes discuss topics about the Maltese flora and ID of plants.
Curiously I found a few ononis natrix growing in the grounds of the secondary school at Mtarfa just yesterday - still in flower too.
Could it be there is also euphotbia characias in the area. I seem to recall someone mentioned characias at Mtarfa.
Wolf found Euphorbia peplis at Ramla last summer I guess. Here is the link of the post. viewtopic.php?t=16
According to the Red Data Book, Euphorbia characias was still present there at Mtarfa at that time (1988). I guess that it is still there, since it has not been particularly built up.