{{Short description|Extinct genus of spore-bearing plants}} {{About|the genus of extinct lycophytes|other plant genera|#Taxonomy}} {{Automatic taxobox |fossil_range = {{Geological range/linked|Emsian}} |taxon = Cyclostigma |authority = Haught., nom. cons.<ref name=ICNapps/> }}

'''''Cyclostigma''''' is a genus of extinct plants belonging to the Lycopodiopsida (lycopsids).

==Taxonomy== ''Cyclostigma'' <small>Haught.</small> was first used by Samuel Haughton in 1859 for the type species ''C.&nbsp;kiltorkense''.<ref name=ICNapps/> The name ''Cyclostigma'' has been used for a genus no fewer than four times. Three are synonyms: *''Cyclostigma'' <small>Hochst. ex Endl.</small> is a synonym of ''Voacanga'' <small>Thouars</small>.<ref name=POWO_30078353-2/> This is the oldest name, dating from 1842, and so would normally have priority but ''Cyclostigma'' <small>Haught.</small> has been conserved against it.<ref name=ICNapps/> *''Cyclostigma'' <small>Klotzsch</small> is a synonym of ''Croton'' <small>L.</small><ref name=POWO_322019-2/> *''Cyclostigma'' <small>Phil.</small> is a synonym of ''Leptoglossis'' <small>Benth.</small><ref name=POWO_38331-1/>

Hao and Xue in 2013 listed ''Cyclostigma'' as a lycopsid.<ref name=HaoXue13/>

==References== {{Reflist|refs= <ref name=HaoXue13>{{Citation |last1=Hao |first1=Shougang |last2=Xue |first2=Jinzhuang |date=2013 |title=The early Devonian Posongchong flora of Yunnan: a contribution to an understanding of the evolution and early diversification of vascular plants |location=Beijing |publisher=Science Press |isbn=978-7-03-036616-0 |url=https://www.researchgate.net/publication/269875285 |accessdate=2019-10-25 |page=329 |name-list-style=amp }}</ref>

<ref name=ICNapps>{{Citation |title=Search for 'Cyclostigma' |website=International Code of Nomenclature for algae, fungi, and plants: Appendices I–VII |publisher=Smithsonian National Museum of Natural History |url=https://naturalhistory2.si.edu/botany/codes-proposals/ |accessdate=2019-10-31 }}</ref>

<ref name=POWO_38331-1>{{citation |title=''Cyclostigma'' <small>Phil.</small> |work=Plants of the World Online |publisher=Royal Botanic Gardens, Kew |url=https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:38331-1 |accessdate=2019-10-31 }}</ref>

<ref name=POWO_322019-2>{{citation |title=''Cyclostigma'' <small>Klotzsch</small> |work=Plants of the World Online |publisher=Royal Botanic Gardens, Kew |url=https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:322019-2 |accessdate=2019-10-31 }}</ref>

<ref name=POWO_30078353-2>{{citation |title=''Cyclostigma'' <small>Hochst. ex Endl.</small> |work=Plants of the World Online |publisher=Royal Botanic Gardens, Kew |url=https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:30078353-2 |accessdate=2019-10-31 }}</ref> }}

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Category:Prehistoric lycophytes Category:Prehistoric lycophyte genera

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