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(Last Modified On 10/16/2012)
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(Last Modified On 10/16/2012)
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Genus
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ECHINODORUS
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PlaceOfPublication
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Mem. Mus. Paris 1:365. 1815
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Reference
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Small, N. Am. Fl. 17':45. 1909.
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Synonym
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Helianthium Engelm. ex Britton, Man. 54. 1905
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Description
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Annual or perennial, usually acaulescent, marsh herbs. Leaves erect or ascend- ing, narrow or broad, cordate or attenuate at the base. Flowering scapes generally surpassing the leaves, simple or branched, bearing 1 to numerous whorls of flowers, the pedicels short or virtually lacking. Flowers all perfect; sepals 3, green; petals 3, white or pink; stamens few or numerous; carpels numerous; fruit an achene.
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Key
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a. Plants very small, about 3-15 cm. tall; leaves linear to narrowly ellip- tic, not cordate; inflorescences simple, bearing 1-2 clusters of flowers_ I. E. TENELLUS aa. Plants large, 1 m. tall or more; leaves broadly cordate; inflorescences usually branched at the base, bearing numerous clusters of flowers. b. Flowers distinctly pedicellate, at least in fruit; inflorescences simple or sparingly branched at the base. c. Sepals not accrescent, reflexed from the fruit-head; pedicels and petioles muricate _ 2. E. MURICATUS cc. Sepals accrescent and enveloping the fruit-head; pedicels and petioles not muricate - --3. E. LONGIPETALUS bb. Flowers sessile or virtually so; inflorescences paniculately branched 4. E. BRACTEATUS
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