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

plural of corn thistle

Any thistle of genus Carduus found along a shore, known to cause poisoning of ruminants. / A thistle of the species Carduus tenuiflorus.

Any of several species of genus Salsola and its close relatives, prickly shrublike annuals, especially Salsola tragus (syn. Kali tragus, which is the best-known kind of tumbleweed in the US.