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Roundleaf Mudplantain

Heteranthera rotundifolia (Kunth) Griseb.

Comments

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Heteranthera rotundifolia is closely related to H. limosa and has been considered conspecific with it by many, including D. S. Correll and H. B. Correll (1972), who noted differences in stem development but did not recognize them taxonomically. Close study of reproduction and seedling development (C. N. Horn 1988) has revealed other differences, besides yet others in flower morphology (cf. the descriptions). Seedlings of H. rotundifolia have flexible petioles and commonly develop elongate stems, while those of H. limosa have rigid petioles, even in deep water, and rarely develop elongate stems.
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Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
bibliographic citation
Flora of North America Vol. 26: 41, 44, 45 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
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Flora of North America @ eFloras.org
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Flora of North America Editorial Committee
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eFloras.org
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Description

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Plants annual. Vegetative stems submersed with elongate inter-nodes, or if emersed at early age, then procumbent. Flowering stems 2–12 cm, distal internode 1–6 cm. Sessile leaves submersed, forming basal rosette; blade linear to oblanceolate, thickened, 2.4–5 cm × 2–4 mm. Petiolate leaves floating or emersed; stipule 1–5 cm; petiole 3–11 cm; blade round to oblong, 1–5 cm × 5–25 mm, length equaling (or, on young plants, greater than) width, base cordate to truncate, apex obtuse. Inflorescences 1-flowered; spathes 1–2.8 mm, glabrous. Flowers opening within 1 hour after dawn, wilting by midday; perianth blue or white, salverform, tube 11–29 mm, limbs essentially actinomorphic, lobes narrowly elliptic, 5.2–18.2 mm, proximal lobe longer, distal central lobe with lateral flanges toward base; stamens unequal, lateral stamens 2.8–8 mm, central stamen 3.9–8.5 mm; filaments linear, curved downward apically, glandular-pubescent; style glabrous. Seeds 8–15-winged, 0.5–1 × 0.3–0.6 mm. 2n = 14.
license
cc-by-nc-sa-3.0
copyright
Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
bibliographic citation
Flora of North America Vol. 26: 41, 44, 45 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
source
Flora of North America @ eFloras.org
editor
Flora of North America Editorial Committee
project
eFloras.org
original
visit source
partner site
eFloras

Distribution

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Ariz., Calif., Colo., Kans., Ky., Mo., Nebr., N.Mex., Okla., S.Dak., Tex.; West Indies; Central America; South America (except Chile, French Guiana, Guyana, Peru, Suriname); naturalized in Italy.
license
cc-by-nc-sa-3.0
copyright
Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
bibliographic citation
Flora of North America Vol. 26: 41, 44, 45 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
source
Flora of North America @ eFloras.org
editor
Flora of North America Editorial Committee
project
eFloras.org
original
visit source
partner site
eFloras

Flowering/Fruiting

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Flowering Jun--Oct.
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cc-by-nc-sa-3.0
copyright
Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
bibliographic citation
Flora of North America Vol. 26: 41, 44, 45 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
source
Flora of North America @ eFloras.org
editor
Flora of North America Editorial Committee
project
eFloras.org
original
visit source
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eFloras

Habitat

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Shallow water or exposed mud of ephemeral pools, roadside ditches, small ponds; 0--2800m.
license
cc-by-nc-sa-3.0
copyright
Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
bibliographic citation
Flora of North America Vol. 26: 41, 44, 45 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
source
Flora of North America @ eFloras.org
editor
Flora of North America Editorial Committee
project
eFloras.org
original
visit source
partner site
eFloras

Synonym

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Heteranthera limosa (Swartz) Willdenow var. [ß] rotundifolia Kunth, Enum. Pl. 4: 122. 1843
license
cc-by-nc-sa-3.0
copyright
Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
bibliographic citation
Flora of North America Vol. 26: 41, 44, 45 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
source
Flora of North America @ eFloras.org
editor
Flora of North America Editorial Committee
project
eFloras.org
original
visit source
partner site
eFloras