''Cyclostigma'' is a

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...

of extinct plants belonging to the

Lycopodiopsida Lycopodiopsida is a class of vascular plants known as lycopods, lycophytes or other terms including the component lyco-. Members of the class are also called clubmosses, firmosses, spikemosses and quillworts. They have dichotomously branching s ...

(lycopsids).

Taxonomy

''Cyclostigma'' Haught. was first used by

Samuel Haughton Samuel Haughton (21 December 1821 – 31 October 1897) was an Irish clergyman, medical doctor, and scientific writer. Biography The scientist Samuel Haughton was born in Carlow, the son of another Samuel Haughton (1786-1874) and grandson (by h ...

in 1859 for the type species ''C. kiltorkense''. The name ''Cyclostigma'' has been used for a genus no fewer than four times. Three are

synonym A synonym is a word, morpheme, or phrase that means exactly or nearly the same as another word, morpheme, or phrase in a given language. For example, in the English language, the words ''begin'', ''start'', ''commence'', and ''initiate'' are all ...

s: *''Cyclostigma'' Hochst. ex Endl. is a synonym of ''

Voacanga ''Voacanga'' is a genus of plants in the family Apocynaceae found in Africa, Southeast Asia, New Guinea, and Australia. the World Checklist of Selected Plant Families recognises 13 species:Search for "Voacanga", ;Species # ''Voacanga africana' ...

'' 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 Lycopodiopsida is a class of vascular plants known as lycopods, lycophytes or other terms including the component lyco-. Members of the class are also called clubmosses, firmosses, spikemosses and quillworts. They have dichotomously branching s ...

References

Prehistoric lycophytes Prehistoric lycophyte genera {{paleo-lycophyte-stub