Cabomba haynesii is a species of aquatic plant in the family Cabombaceae native to the Caribbean, Central America, and South America.
Description Vegetative characteristics Cabomba haynesii is an aquatic, rhizomatous, long-stemmed herb with both submerged and floating leaves. The pilose, green to red stems with red papillae at the nodes have two vascular bundles. The dissected, oppositely arranged, petiolate, submerged leavesWiersema, J. H. (1989). A new species of Cabomba (Cabombaceae) from tropical America. Annals of the Missouri Botanical Garden, 76(4), 1167-1168. are 0.5-0.9 cm long, and 1.4-1.8 cm wide. The glabrous petiole is 0.5-0.8 mm long.Matias, L. Q., & Nascimento, H. P. D. (2021). Flora of Ceará, Brazil: Cabombaceae. Rodriguésia, 72, e00592019. Generative characteristics The pinkish-purple to white,WFO (2024): Cabomba haynesii Wiersema. Published on the Internet;http://www.worldfloraonline.org/taxon/wfo-0000705668. Accessed on: 21 Nov 2024 1–1.5 cm wide flowers with 1.5-1.8 cm long pedicels float on the water surface, or extend beyond it. The base of the petals is auriculate. The flowers have 3 (5) stamens and (1–) 2 (–3) carpels. The oblong to ovoid seeds are 1.8-2.5 mm long, and 1-2 mm wide.Pellegrini, M.O.O. Cabombaceae in Flora e Funga do Brasil. Jardim Botânico do Rio de Janeiro. Available at:<https://floradobrasil.jbrj.gov.br/FB34569>. consulta.publica.uc.citacao.acesso.em04 Oct. 2024
Taxonomy It was first described as Cabomba piauhiensis f. albida Fassett by Norman Carter Fassett in 1953. Later, it was described as the new species Cabomba haynesii Wiersema by John Harry Wiersema in 1989.Fassett, N. C. (1953). A Monograph of Cabomba. Castanea, 18(4), 116–128. http://www.jstor.org/stable/4031558 The type specimen was collected by J. Steiner, C. von Chong, and H. KennedyCabomba haynesii | International Plant Names Index. (n.d.). Retrieved October 4, 2024, from https://www.ipni.org/n/938414-1 in the Chagres River in Gamboa, Panama on the 8th of February 1973.
Hybridisation It has been speculated that Cabomba haynesii may be a result of a hybridisation event involving Cabomba palaeformis and Cabomba furcata.Wilson, C. E., Darbyshire, S. J., & Jones, R. (2007). The biology of invasive alien plants in Canada. 7. Cabomba caroliniana A. Gray. Canadian Journal of Plant Science, 87(3), 615-638.
Etymology The specific epithet haynesii honours Robert R. Haynes.
Ecology Habitat In Brazil, it is found in seasonally flooded lagoons,Lima, C. T. D., & Gil, A. D. S. B. (2016). Flora das cangas da Serra dos Carajás, Pará, Brasil: Cabombaceae. Rodriguésia, 67, 1273-1276. or in temporary or permanent standing bodies of water. It can occur in slightly brackish water.
Conservattion The NatureServe conservation status is G5 Secure.
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