Lemna trisulca
Ivy-Leaved Duckweed
Colony Top
Moose Jaw River at Highway # 334
04-May-2021
The fronds are 2-3.5 times longer than wide and abruptly narrowed to
green, persistent stalks.
The key answers below are from Rushes,
Bulrushes & Pondweeds plus the remaining Monocots of Saskatchewan, Fascicle
6, Flora of Saskatchewan by V. L. Harms, A. L. Anna Leighton, and M. A. Vetter.
 | Trisulca: Answers to key questions leading to this species.
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Fronds 2-3.5 times longer than wide, abruptly narrowed to
green, persistent stalks 2-20 mm long; colonies 3-50 plants formed from fronds
connected by persistent stalks. NOT [Fronds 1-2 times longer than wide, bases rounded, the stalks thin, white,
often decaying; colonies smaller, 1-several plants.]
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| Lemna: Answers to key questions leading to this genus.
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Roots present, 1-21 per frond; fronds flat or gibbous, air spaces present
and veins 1-21; daughter fronds and flowers arise in marginal pouches. NOT [Roots absent; fronds 3-dimensional (globular), without air
spaces and without veins; daughter fronds arise from terminal pouches; flowers
borne in dorsal cavities on upper frond surface.] |
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Roots 1 per frond; fronds green or reddish below, usually narrower but if
obovate, then 4 mm long at most; veins difficult to distinguish, usually 3.
NOT [Roots more than 1 per frond; fronds purplish brown below,
obovate to circular, up to 10 mm long; veins visible, 7 or more.] |
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