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In page Nymphaeaceae:

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The Nymphaeaceae are annual or perennial,[1] aquatic, rhizomatous herbs.[1][2] The family is further characterized by scattered vascular bundles in the stems, and frequent presence of latex, usually with distinct, stellate-branched sclereids projecting into the air canals. Hairs are simple, usually producing mucilage (slime).[citation needed]