The World Flora Online

Herbs, to 20 cm. Rhizomes absent; stStolon buds with 1 root. Leaves floating or, in dense vegetation, emergent; blade 1.2--6 ´ 1.3--6.3 cm; primary veins forming 75--90° angle with midvein, broadly curving, aerenchyma confined to midvein region (not margin to margin as in Limnobium), individual aerenchyma space (located ca. 1 mm from either side of midvein) 0.1--0.5 mm across its longest axis, 0.1--0.5 mm wide, 1 mm from midvein. Flowers: staminate flowers 1--5 in each spathe; pedicel to 4 cm; stamens 9--12 in 4 whorls; filaments basally not obviously connate; pistillate flowers solitary; pedicels to 9 cm; styles 2-fid for less than ½ length. Seeds 1--1.3 mm. 2n = 28 (Netherlands).

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Much like Limnobium spongia in aspect, but the lvs more consistently cordate-orbicular, less obviously spongy beneath, and with more broadly arching (even initially descending) lateral veins; dioecious; stolons with seasonally dimorphic terminal buds; pet ca 1 cm, 2–3 times as long as the sep, white with a yellow basal spot; outer (antesepalous) stamens basally connate with those of the third cycle; anthers ca 1 mm long and wide; styles 6, ca 4 mm overall; 2n=28. Slow-moving water, ditches, and pools; native of Europe, intr. and spreading, from Que. to s. Ont. and n. N.Y. along the St. Lawrence and Ottawa rivers and along lakes Erie and Ontario.

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Kısa gövdelerde yapraklı, uzun gövdelerde yapraksız su bitkileri. Yapraklar tabanda; aya dairesel, 2,5-5 cm çapında, tabanda yüreksi; yaprak sapı 9-12 cm uzunluğunda. Çiçekler tek eşeyli. Erkek çiçek sıpatası saplı, 1-4 çiçekli; dişi çiçek sıpatası sapsız, 1 çiçekli. Taç yapraklar 3 adet, çanak yapraklardan çok büyük, geniş tersyumurtamsı, 6-10 mm uzunluğunda, beyaz, tabanda sarı benekli. Erkek organlar 9-12 adet, dıştakilerden biri çoğunlukla verimsiz. Meyve 10-15 × 15-17 mm, tersyumurtamsı. Tohumlar armutsu, yüzeyi sivilceli.

Wasserpflanze mit rundlichen, tief herzförmigen Schwimmblättern, diese jederseits mit 2 bogigen, unverzweigten Hauptnerven, rosettig auf 5–10 cm langen Stielen, Durchmesser 1,5–5 cm, mit lanzettlichen, bis 2 cm langen Nebenblättern. Zweihäusig. Blü

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6–8. Stehende, bis 1 m tiefe, warme und nährstoffreiche Gewässer, kollin. M, AN zerstreut.

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SELECTED REFERENCES

Gadella, T. W. J. and E. Kliphuis. 1973. Chromosome numbers of flowering plants in The Netherlands. VI. Proc. K. Ned. Acad. Wet., Ser. C, 76: 303---311.

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