# Hedeia

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*Hedeia* is a [genus](/source/Genus) of early [land plants](/source/Land_plant) of uncertain [affinity](/source/Affinity_(taxonomy)).[1] It comprises erect axes terminating in [corymbose](/source/Corymb) clusters of erect [sporangia](/source/Sporangia).[2]

The type species, *H. corymbosa*, was first described by [Isabel Cookson](/source/Isabel_Cookson) from a few specimens in fine sandstone from near [Alexandra, Victoria](/source/Alexandra,_Victoria), Australia.[3] She gave no derivation of the generic name. At the time, the locality was regarded as being of [Silurian](/source/Silurian) age, but it is now known to be [Early Devonian](/source/Early_Devonian).[4] It is claimed that an undescribed species, also from Victoria, extends from the [Early Devonian](/source/Early_Devonian) back to the [Late Silurian](/source/Late_Silurian).[4]

*H. parvula* from Kazakhstan and *H. sinica* from China are also of Early Devonian age.

It is sometimes suggested that *Hedeia* and *[Yarravia](/source/Yarravia)* are merely different preservations of the same type of plant.[5]

## References

1. Kenrick, P. & Crane, P. R. (1997). "The origin and early evolution of plants on land". *Nature*. **389** (6646): 33. [Bibcode:1997Natur.389...33K](https://ui.adsabs.harvard.edu/abs/1997Natur.389...33K). [doi:10.1038/37918](https://doi.org/10.1038/37918). [S2CID 3866183](https://api.semanticscholar.org/CorpusID:3866183)

1. Chaloner, W. (1972). "Devonian plants from Fair Isle, Scotland". *Review of Palaeobotany and Palynology*. **14** (1–2): 49–72. [doi:10.1016/0034-6667(72)90007-3](https://doi.org/10.1016/0034-6667(72)90007-3)

1. Cookson, I. C. (1935). "On Plant-Remains from the Silurian of Victoria, Australia, that Extend and Connect Floras Hitherto Described". *Philosophical Transactions of the Royal Society B: Biological Sciences*. **225** (521): 127–148. [Bibcode:1935RSPTB.225..127C](https://ui.adsabs.harvard.edu/abs/1935RSPTB.225..127C). [doi:10.1098/rstb.1935.0009](https://doi.org/10.1098/rstb.1935.0009)

1. Tims, J.D. & Chambers, T.C. (1984), "Rhyniophytina and Trimerophytina from the early land flora of Victoria, Australia", *Palaeontology*. **27**: 265–279

1. See e.g. Hao, Shougang & Gensel, Patricia G. (1995), "A New Genus and Species, *Celatheca beckii*, from the Siegenian (Early Devonian) of Southeastern Yunnan, China", *International Journal of Plant Sciences*. **156** (6): 896–909, [doi:10.1086/297312](https://doi.org/10.1086/297312). [JSTOR 2475120](https://www.jstor.org/stable/2475120). [S2CID 86664097](https://api.semanticscholar.org/CorpusID:86664097), p. 906.

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