Lesser Pondweed - Potamogeton pusillus
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Species Description
Widespread but local throughout the UK. Habitat includes: Mesotrophic to eutrophic standing or slow-flowing waters in places such as ponds, lakes, reservoires, rivers, streams, canals, ditches, dykes, rhynes, flooded mineral workings etc. Growing habit: Rhizomatous Perennial.
similar to P. berchtoldii (Small Pondweed) and P. trichoides (Hairlike Pondweed).
Stace 4:
Potamogeton pusillus L. (P. panormitanus Biv.) - Lesser Pondweed.
Stem only slightly compressed; leaves all submerged, linear, 0.5-1.4(1.9)mm wide, acute or obtuse and mucronate at apex, 3(-5)-veined; fruit 1.8-2.3mm; (2n=26, 28, 39). Native; lakes, ponds, canals, streams, mostly in base-rich waster; frequent more or less throughout British Isles, but over-recorded for P. berchtoldii.
Key:
- Stipules fused in tube round stem proximally when young; fruits 1.8-2.3mm
- Leaves acute to obtuse and abruptly mucronate, not rigid; widespread