Northern Prairie Wildlife Research Center
Aquatic and Wetland Vascular Plants of the Northern Great Plains
60. Lemnaceae, the Duckweed Family
1. Lemna L. -- Duckweed
7. Lemna trisulca L. -- Star duckweed
Fronds usually several to many, attached to form star-shaped colonies,
often dense and tangled to form submersed mats, floating at the surface only
when flowering, individual fronds oblong-elliptic to oblong-lanceolate, denticulate
toward the apex, 5-20 mm long including the slender stipitate base, the stipe
often as long as the main body and attached to the parent frond, shorter on
flowering specimens; frond body symmetrical, dark to pale green and translucent,
often reddish or blackish, faintly 3-nerved, flat on both surfaces, the air
spaces small and obscure. Turions not produced. Root deciduous
and thus often lacking on some fronds, the sheath not winged, root tip pointed.
Fruit 1-seeded. Common except in the w and extreme s parts; (Temperate
zones of the N. Hemisphere).
Previous Section -- Lemna perpusilla Torr.
Return to Family -- Lemnaceae - The
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