Erigeron philadelphicus, the Philadelphia fleabane, is a widespread North American plant in the daisy family. Also known as common fleabane, daisy fleabane, frost-root, marsh fleabane, poor robin's plantain, skervish, and in the British Isles as robin's-plantain.

What is called skew?

1 : set, placed, or running obliquely : slanting. 2 : more developed on one side or in one direction than another : not symmetrical.

What means Nodus?

a difficult or intricate point, situation, plot, etc.