thistles is a form of:

Thistle



noun
1.
(a prickly plant with purple, white, organized to do, problem solving, research institute a yellow flowers) រុក្ខជាតិម៉្យាងស្លឹកហើយនិងដើមមានបន្លា
ENGLISH MEANING
noun
1.
Any one of several prickly composite plants, especially those of the genera Cnicus, Craduus, and Onopordon. The name is often also applied to other prickly plants.