Aquatic and Wetland Vascular Plants of the Northern Great Plains
60. Lemnaceae, the Duckweed Family
1. Lemna L. -- Duckweed7. 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).
 Lemna trisulca. |
|
Previous Section -- Lemna perpusilla Torr.
Return to Family -- Lemnaceae - The Duckweed Family
Next Section -- Lemna turionifera Landolt
