English edit

 
Polygonum arifolium (Halberdleaf tearthumb)
Wikispecies has information on:

Wikispecies

Etymology edit

tear +‎ thumb

Noun edit

tearthumb (plural tearthumbs)

  1. Any of a group of annual vining plants within the genus Polygonum, with small sharp spines covering the stems.

Further reading edit

Anagrams edit