Trithuria cookeana is a species of aquatic plant in the family Hydatellaceae endemic to the Northern Territory, Australia.[1]
| Trithuria cookeana | |
|---|---|
Scientific classification 
| |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Order: | Nymphaeales |
| Family: | Hydatellaceae |
| Genus: | Trithuria |
| Species: | T. cookeana
|
| Binomial name | |
| Trithuria cookeana | |
| |
| Trithuria cookeana is endemic to the Northern Territory, Australia[1] | |
Description
editVegetative characteristics
editTrithuria cookeana is an annual aquatic herb with linear leaves. The plant displays red colouration, once it starts flowering.[2]
Generative characteristics
editIt is a dioecious plant with unisexual reproductive units ("flowers"). Male individuals have 10 reproductive units, which are produced on 13–30 mm long peduncles. The male reproductive unit is composed of 5–7, 6.0–8.2 mm long, and 1–1.5 mm wide involucral bracts, and 14–17 stamens. The anthers are 1.7–1.9 mm long. Female individuals produce up to 45 reproductive units on 12–40 mm long peduncles. The female reproductive unit is composed of 10–16(–21), 1.5–2.6 mm long, and 0.15–0.45 mm wide involucral bracts, as well as more than 40 carpels.[2] The 0.29–0.31 mm long,[3] indehiscent fruit bears smooth seeds.[2]
Distribution
editIt occurs in the swamps of the Northern Territory, Australia.[2]
Taxonomy
editTrithuria cookeana D.D.Sokoloff, Remizowa, T.D.Macfarl. & Rudall was published by Dmitry Dmitrievich Sokoloff, Margarita Vasilyena Remizowa, Terry Desmond Macfarlane & Paula J. Rudall in 2008.[2][1] The type specimen was collected by Ian D. Cowie 24 km Southeast of Maningrida, Northern Territory, Australia on the 22nd of August 1995.[2] It is placed in Trithuria sect. Altofinia.[4][3]
Etymology
editThe specific epithet cookeana honours David Alan Cooke.[2]
Conservation
editThe conservation status is Data Deficient.[5] It is only known from a single locality.[6]
Ecology
editIt occurs sympatrically with Utricularia growing on damp sand at the edge of drying swamps with Melaleuca viridifolia growing in the overstory layer. The swamp habitat dries out by August.[7]
References
edit- ^ a b c d "Trithuria cookeana D.D.Sokoloff, Remizowa, T.D.Macfarl. & Rudall". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 30 October 2024.
- ^ a b c d e f g 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.
- ^ a b 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.
- ^ 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.
- ^ Northern Territory Government. (n.d.). Trithuria cookeana D.D.Sokoloff, Remizowa, T.D.Macfarl. & Rudall. FloraNT. Retrieved November 2, 2024, from https://eflora.nt.gov.au/factsheet?id=2783
- ^ Iles, W. J. D. (2013). The phylogeny and evolution of two ancient lineages of aquatic plants (Doctoral dissertation, University of British Columbia).
- ^ Sokoloff, D. D., Remizowa, M. V., Macfarlane, T. D., Yadav, S. R., & Rudall, P. J. (2011). Hydatellaceae: a historical review of systematics and ecology. Rheedea, 21(2), 115-138.