Two new species of Heteranthera (Pontederiaceae) in North America

Authors

  • Charles N. Horn Department of Biology, Newberry College

DOI:

https://doi.org/10.17348/jbrit.v14.i1.886

Abstract

Two new species are here described as segregates from Heteranthera multiflora. Heteranthera missouriensis sp. nov. has 5–13 flowers on an elongate floral axis, lavender to purplish flowers, a smaller perianth with the tube 3–5 mm long and lobes 3–4.5 mm long; it is common in the southern Great Plains of North America. Heteranthera pauciflora sp. nov. has 3–6 flowers on a shortened floral axis, commonly enclosed by the subtending spathe, white to light lavender flowers with the tube 8–10 mm long; it is known from the Atlantic coast from New Jersey to North Carolina. A taxonomic key to all species of the genus in North America, and a modified description of Heteranthera multiflora, are provided.

References

GRISEBACH, A.H.R. 1879. Symbolae ad Floram Argentinam. Zweite Bearbeitung argentinischer Pflanzen. Gottingen (Dieterich), Germany.

HORN, C.N. 1985. A systematic revision of the genus Heteranthera (sensu lato; Pontederiaceae). PhD dissertation, University of Alabama, Tuscaloosa, U.S.A.

HORN, C.N. 1986. Typifications and a new combination in Heteranthera (Pontederiaceae). Phytologia 59:290.

HORN, C.N. 1987. Pontederiaceae. In: R. Spichiger, ed. Flora of Paraguay. Conservatoire et Jardin Botaniques, Geneve, Switzerland and Missouri Botanical Garden, St. Louis, U.S.A.

HORN, C.N. 2002. Pontederiaceae, Pickerel-weed Family. In: Flora of North America Editorial Committee, eds. Flora of North America, Oxford University Press, UK. 26:37–46.

PELLEGRINI, M.O. & C.N. HORN. 2017. Two peculiar new species of Heteranthera Ruiz & Pavon (Pontederiaceae) from Brazil, with notes on inflorescences architecture in the family. PhytoKeys 82:35–56. doi: 10.3897/phytokeys.@.13752.

SOUSA, D.J.L. DE, L.Y.S. AONA, & A.M. GIULIETTI. 2018. Heteranthera longirachilla (Pontederiaceae), a misinterpreted new species of the H. reniformis complex. Syst. Bot. 43(2):502–509. doi: 10.1600/036364418X697238.

Published

2020-07-15

How to Cite

Horn, C. N. (2020). Two new species of Heteranthera (Pontederiaceae) in North America. Journal of the Botanical Research Institute of Texas, 14(1), 1–8. https://doi.org/10.17348/jbrit.v14.i1.886