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Published In: Species Plantarum 2: 970. 1753. (1 May 1753) (Sp. Pl.) Name publication detailView in BotanicusView in Biodiversity Heritage Library
 

Project Name Data (Last Modified On 6/2/2011)
Acceptance : Accepted
Project Data     (Last Modified On 6/3/2011)
Contributor Text: RIZWAN Y. HASHMI & SAOOD OMER
General/Distribution: A small genus of c. 15 species distributed in both the hemispheres of the world, represented in Pakistan by 5 species.

 

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Fronds submerged or more usually, floating, in abundant number, solitary or in groups, oblong to ovate, asymmetrical or occasionally symmetrical, thin or spongy, 1-3 (-5)-veined, young thallus budding from the lateral pocket. Root solitary, one per frond, devoid of hairs, shortly sheathed near point of origin; sheath simple or winged laterally. Floral pocket lateral with spathe enclosing 2 staminate and one pistillate flowers, anther 4-thecous, ovary globose, ovules 1-6. Fruits 1-5-seeded. Seeds ribbed longitudinally.
 

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1 Fronds submerged, or floating; translucent, ± acute and serrulate at apex, forming branched chains 1 Lemna trisulca
+ Fronds floating; opaque, ± obtuse and entire at apex and margins, not forming Chains (2)
2 (1) Fronds forming turions 2 Lemna turionifera
+ Fronds not forming turions (3)
3 (2) Fronds gibbous beneath; air spaces often larger than 03 mm 3 Lemna gibba
+ Fronds flat beneath; air spaces smaller than 03 mm (4)
4 (3) Root sheath winged, cap acute. Flowers surrounded by an open spathe 5 Lemna aequinoctialis
+ Root sheath not winged, cap obtuse. Flowers enclosed in ± closed spathe 4 Lemna minor
 
 
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