Corn thistle (Cirsium arvense).

plural of Canada thistle

Any of about 30 species of thistles in the genus Carlina and certain other closely related genera.

plural of creeping thistle

A perennial herb, Cirsium arvense.

Any of the thistles in one of the genera Cicerbita and Sonchus.

Corn thistle.

Any of the thistles in the genus Silybum, especially Silybum marianum. / Lactuca serriola, prickly lettuce / Sonchus asper rough milk thistle / Sonchus arvensis field milk thistle

(dialect or humorous) that way; in that direction.

plural of corn thistle