Trithuria sect. Hydatella

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Trithuria sect. Hydatella
Temporal range: 16.07 –0  Ma
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Early Miocene – Recent [1]
Trithuria inconspicua iNat2.jpg
Flowering Trithuria inconspicua
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Order: Nymphaeales
Family: Hydatellaceae
Genus: Trithuria
Section: Trithuria sect. Hydatella
(Diels) D.D. Sokoloff, Iles, Rudall & S.W. Graham [2]
Type species
Trithuria australis
(Diels) D.D. Sokoloff, Remizowa, T.D. Macfarl. & Rudall [2]
Species

See here

Trithuria sect. Hydatella is a section within the genus Trithuria [2] native to New Zealand and Australia. [3]

Contents

Description

Trithuria inconspicua Trithuria inconspicua iNat1.jpg
Trithuria inconspicua
Botanical illustration of Trithuria australis Botanische Jahrbucher fur Systematik, Pflanzengeschichte und Pflanzengeographie (1904) (20402793025).jpg
Botanical illustration of Trithuria australis

The apocarpous berry fruit is indehiscent. [4] Pericarp papillae and pericarp ribs are absent. [2] The fruit stalk bears a distal constriction, serving as an abscission zone. [5] The seed cuticle is thick. [2]

Taxonomy

It was first described as HydatellaDiels by Friedrich Ludwig Emil Diels in 1904. [6] [7] After the former genus HydatellaDiels was merged into TrithuriaHook.f. in 2008, [8] the section Trithuria sect. Hydatella(Diels) D.D. Sokoloff, Iles, Rudall & S.W. Graham was described by Dmitry Dmitrievich Sokoloff, William J. D. Iles, Paula J. Rudall, and Sean W. Graham in 2012. [2]

Species

It has four species:

Etymology

The section name Hydatella comes from the former genus HydatellaDiels, [2] whose name is derived from the diminutive of ύδωρ (hydor) meaning water. [9]

Distribution

Its species occur in New Zealand (North Island, South Island) and Australia (Tasmania, Australian mainland). [3]

Phylogeny

Trithuria sect. Hydatella split from Trithuria sect. Trithuria about 16 million years ago in the Early Miocene. [1] [10]

References

  1. 1 2 Iles, W. J., Lee, C., Sokoloff, D. D., Remizowa, M. V., Yadav, S. R., Barrett, M. D., ... & Graham, S. W. (2014). Reconstructing the age and historical biogeography of the ancient flowering-plant family Hydatellaceae (Nymphaeales). BMC evolutionary biology, 14, 1-10.
  2. 1 2 3 4 5 6 7 8 9 10 11 Iles, W. J., Rudall, P. J., Sokoloff, D. D., Remizowa, M. V., Macfarlane, T. D., Logacheva, M. D., & Graham, S. W. (2012). Molecular phylogenetics of Hydatellaceae (Nymphaeales): Sexual‐system homoplasy and a new sectional classification. American Journal of Botany, 99(4), 663-676.
  3. 1 2 de Lange, P., & Mosyakin, S. L. (2019). Trithuria brevistyla (Hydatellaceae), a new combination for the New Zealand endemic species from the South Island.
  4. ↑ Romanov, M. S., Bobrov, A. V. C., Iovlev, P. S., Roslov, M. S., Zdravchev, N. S., Sorokin, A. N., ... & Kandidov, M. V. (2024). Fruit and seed structure in the ANA‐grade angiosperms: Ancestral traits and specializations. American Journal of Botany, 111(1), e16264.
  5. ↑ Sokoloff, D. D., Remizowa, M. V., Macfarlane, T. D., Conran, J. G., Yadav, S. R., & Rudall, P. J. (2013). Comparative fruit structure in Hydatellaceae (Nymphaeales) reveals specialized pericarp dehiscence in some early–divergent angiosperms with ascidiate carpels. Taxon, 62(1), 40-61.
  6. ↑ Hydatella Diels. (n.d.). International Plant Names Index. Retrieved June 8, 2025, from https://www.ipni.org/n/6723-1
  7. ↑ Diels, L., & Pritzel, E. (1905). Fragmenta phytographiae Australiae occidentalis: beiträge zur kenntnis der pflanzen westaustraliens, ihrer lebens-verhältnisse. p. 93. Wilhelm Engelmann.
  8. ↑ Sokoloff, D. D., Remizowa, M. V., Macfarlane, T. D., & Rudall, P. J. (2008). Classification of the early‐divergent angiosperm family Hydatellaceae: One genus instead of two, four new species and sexual dimorphism in dioecious taxa. Taxon, 57(1), 179-200.
  9. ↑ Christenhusz, Maarten J. M., Fay, Michael F. and Chase, Mark W.. "The ANA grade families". Plants of the World: An Illustrated Encyclopedia of Vascular Plants, Chicago: University of Chicago Press, 2017, pp. 88-94. https://doi.org/10.7208/9780226536705-016
  10. ↑ Lin, Q. (2014). Using a low-copy nuclear gene (phosphoglycerate kinase; PGK) to explore the phylogeny of the aquatic plant family Hydatellaceae (Nymphaeales) (Doctoral dissertation, University of British Columbia).
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