''Cyclostigma'' is a

genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...

of extinct plants belonging to the

Lycopodiopsida Lycopodiopsida is a class of vascular plants also known as lycopsids, lycopods, or lycophytes. Members of the class are also called clubmosses, firmosses, spikemosses and quillworts. They have dichotomously branching stems bearing simple leaves ...

(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 precisely 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 a ...

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 also known as lycopsids, lycopods, or lycophytes. Members of the class are also called clubmosses, firmosses, spikemosses and quillworts. They have dichotomously branching stems bearing simple leaves ...

References

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