pickerelweed

[pik-er-uhl-weed, pik-ruhl-]
noun
any American plant of the genus Pontederia, especially P. cordata, having spikes of blue flowers, common in shallow fresh water.

Origin:
1645–55; pickerel + weed1

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World English Dictionary
pickerelweed (ˈpɪkərəlˌwiːd, ˈpɪkrəl-)
 
n
any of several North American freshwater plants of the genus Pontederia, esp P. cordata, having arrow-shaped leaves and purple flowers: family Pontederiaceae

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica
Encyclopedia

pickerelweed

any of several genera of aquatic plants comprising the family Pontederiaceae, especially those of the genus Pontederia. Most species are perennials, native primarily to tropical America. They have creeping rootstocks, fibrous roots, and leaves in clusters at the base of the plant or borne on branched stems. The fruit is a capsule containing many seeds, or a one-seeded winged structure. Plants of the genus Pontederia, about five species of perennials, have spikes of bluish-purple flowers at the top of a one-leaved stem, clusters of lance- or heart-shaped leaves at the base, and thick rootstocks.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Plants and trees that could be found in a slough include pickerelweed, alder, willow and bulrushes.
Torrey's bulrush and arrowhead are common and pickerelweed is dominant.
The dominant vegetation in marshes is soft-stemmed plants such as cattail, bull rush and pickerelweed.
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