Biology:Karkeniaceae
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Short description: Extinct family of seed-bearing plants
| Karkeniaceae | |
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| Leaves and seeds of Karkenia henanensis (centre) with Yimaia recurva (top right) | |
Scientific classification 
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| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Gymnospermae |
| Division: | Ginkgophyta |
| Class: | Ginkgoopsida |
| Order: | Ginkgoales |
| Family: | †Karkeniaceae Krassilov, 1972 |
| Genera | |
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Karkenia Archangelsky, 1965 | |
Karkeniaceae is an extinct family in the order Ginkgoales. It contains the single genus Karkenia. It is distinguished by "Ovulate organs consisting of a peduncle and helically arranged, up to about 100 small, orthotropous but incurved ovules; pedicel present; nucellus largely free." Unlike other ginkgoales, the seeds are borne on cone-like aggregations. Ovuluate organs of Karkenia are associated with leaves of the Ginkgoites, Sphenobaiera and Eretmophyllum types. It is known from the Hettangian to Aptian of both Hemispheres.[1]
References
- ↑ Zhou, Zhi-Yan (March 2009). "An overview of fossil Ginkgoales" (in en). Palaeoworld 18 (1): 1–22. doi:10.1016/j.palwor.2009.01.001. https://linkinghub.elsevier.com/retrieve/pii/S1871174X0900002X.
Wikidata ☰ Q6371286 entry
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