title: Cyclostigma
text: # Cyclostigma
  
  Cyclostigma is a genus of extinct plants belonging to the Lycopodiopsida (lycopsids).
  
  ## Taxonomy
  
  Cyclostigma Haught. was first used by Samuel Haughton in 1859 for the type species C. kiltorkense. The name Cyclostigma has been used for a genus no fewer than four times. Three are synonyms:
  
  * Cyclostigma Hochst. ex Endl. is a synonym of Voacanga Thouars. This is the oldest name, dating from 1842, and so would normally have priority but Cyclostigma Haught. has been conserved against it.
  * Cyclostigma Klotzsch is a synonym of Croton L.
  * Cyclostigma Phil. is a synonym of Leptoglossis Benth.
  
  Hao and Xue in 2013 listed Cyclostigma as a lycopsid.
  
  