Blunt-leaved Pondweed - Potamogeton obtusifolius
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Species Description
Widespread but local throughout the UK. Habitat includes: Mesotrophic to meso-eutrophic, acidic or neutral standing waters in places such as ponds, lakes, flooded mineral workings, canals, streams, backwaters of rivers etc. Growing habit: Rhizomatous Perennial. Flowers: June to September.
Stace 4:
Potamogeton obtusifolius Mert. & W.D.J. Koch - Blunt-leaved Pondweed.
Stem only slightly compressed; leaves all submerged, linear, usually <10cm long, (1)2.5-3.5mm wide, obtuse or rounded and apiculate at apex, 3-5-veined; fruit 2.6-3.2mm; (2n=26). Native; lakes, ponds, canals, streams; locally frequent more or less throughout British Isles except extreme North Scotland and Channel islands.
Key:
- Leaves entire or minutely serrate just near apex; fruits, if formed, with beak <1/2 as long as body
- Stems with many lateral branches closely placed, forming fan-like sprays; stipules not fused in tube round stem