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Herbs, perennial, to 100 cm; rhizomes coarse; stolons absent; corms absent. Leaves submersed or emersed; submersed leaves phyllodial, angled abaxially, flattened adaxially, 6.4--35 ´ 0.5--4 cm; emersed with petiole triangular, 6.5--17 cm, blade linear to linear-oblanceolate, 2.5--17.4 ´ 0.2--4 cm. Inflorescences racemes or panicles, of 1--12 whorls, emersed, 2.5--21 ´ 1--8 cm; peduncles 6.5--29.7 cm; bracts connate more than to equal to ¼ total length, broadly subulate to lanceolate, 20--50 mm, coarse, not papillose; fruiting pedicels spreading, cylindric, 0.5--5 cm. Flowers to 2.3 cm diam.; sepals recurved to spreading, not enclosing flower; filaments dilated, shorter than anthers, pubescent; pistillate flowers pedicellate, without ring of sterile stamens. Fruiting heads 0.6--1.5 cm diam.; achenes oblanceoloid, without abaxial keel, 1.5--2.8 ´ 1.1--1.5 mm, beaked; faces not tuberculate, abaxial wings 0--1, ± entire, glands 1--2; beak lateral, erect, 0.2 mm.


Creative Commons Attribution Non Commercial Share Alike 3.0 (CC BY-NC-SA 3.0)

© Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA

Source: Missouri Botanical Garden

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