Comments
provided by eFloras
No specimens have been seen from New Jersey, but although the species is to be expected there.
Limnobium spongia has two leaf forms, often on the same plant. The floating leaves have a thick layer of aerenchyma on the abaxial surface; the emersed leaves lack such tissue. Flowering and fruiting are predominantly on individuals with emersed leaves. Following pollination, the peduncle becomes recurved, forcing the developing fruit below the water surface.
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- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
Description
provided by eFloras
Herbs, to 50 cm. Roots branched; stolon buds with 10 or more roots. Leaves floating or emersed in dense vegetation and when stranded; blade 1--10 ´ 0.9--7.8 cm; primary veins forming 30--80° angle with midvein, ascending, aerenchyma extensive, nearly margin to margin, individual aerenchyma space (located ca. 1 mm from either side of midvein) , 0.4--1.6 mm wide, 1 mm from midveinacross its longest axis. Flowers: staminate flowers with 9--12(--18) stamens; pistillate flowers with 3--4 petals; ovary 6--9-carpellate, locules 6--9; styles 2-fid nearly to base; ovules 200. Fruits 4--12 mm diam.
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- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
Distribution
provided by eFloras
Ala., Ark., Del., Fla., Ga., Ill., Ky., La., Md., Miss., Mo., N.Y., N.C., Okla., S.C., Tenn., Tex., Va.
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- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
Flowering/Fruiting
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Flowering summer--fall.
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Habitat
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Floating on slow-moving water of streams, bayous, and lakes or stranded along shore; 0--100m.
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Synonym
provided by eFloras
Hydrocharis spongia Bosc, Ann. Mus. Natl. Hist. Nat. 9: 396. 1807
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- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
Comprehensive Description
provided by North American Flora
Limnobium spongia (Bosc) Rich.; Steud. Norn. Bot
ed. 2. 45. 1841.
Hydrocharis Spongia Bosc, Ann. Mus. Paris 9 : 396. 1807. Limnobium Bosci Rich. Mem. Inst. Paris 2 : 32. 1811. Hydrocharis cordifolia Nutt. Gen. 2 : 241. 1818.
Petioles erect or ascending, 5-2.5 cm. long; leaf-blades ovate to suborbicular or the earlier reniform, 2-5 cm. broad, obtuse at the apex, truncate or cordate at the base, entire, purplish beneath, becoming somewhat spongy in winter ; staminate scapes 7-10 cm. long, filiform; spathe lance-ovoid, 3-5 cm. long; pistillate scapes about 2.5 cm. long, stout, recurved in fruit; sepals 7-10 mm. long, oblong; petals linear, 8-10 mm. long; anthers linear, about 4 mm. long; stigmas filiform, 10-15 mm. long, papillose-ciliate ; berry oval, 1-1.5 cm. long.
Type locality : South Carolina.
Distribution : Shallow water, from New Jersey and Ontario to Florida, Texas, Missouri, and
- bibliographic citation
- Percy Wilson, Per Axel Rydberg, Norman Taylor, Nathaniel Lord Britton, John Kunkel Small, George Valentine Nash. 1909. PANDANALES-POALES; TYPHACEAE, SPARGANACEAE, ELODEACEAE, HYDROCHARITACEAE, ZANNICHELLIACEAE, ZOSTERACEAE, CYMODOCEACEAE, NAIADACEAE, LILAEACEAE, SCHEUCHZERIACEAE, ALISMACEAE, BUTOMACEAE, POACEAE (pars). North American flora. vol 17(1). New York Botanical Garden, New York, NY
