Encyclopaedia Artichokistania (5)

Mensurae  triangulum 

The leaves are ruler-shaped, often with centimeter indications. These plants used to be very common nearby schools, today however pretty rare. The mathematician students are picking the leaves for school use (mainly by students studying geometry). The flowers are red, sometimes with a white stripe and blooming from August to September.

Some leaves have bevelled edge and so-called ink edge. Rare forms also with protractor-like leaves.