Potamogeton praelongus
- Overview
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- Biology
- Taxonomy
- Occurrence
- Specimen
Growing form
Perennial aquatic herb.
Size
0.5–2.5 m long.
Stem
The rhizome is creeping. The stem is flaccid and geniculate near the summit.
Leaf
The leaf arrangement is spiral. The leaves are sheathless. There is a stipule at the joint of the stem and a leaf. The stipules are 3–4 cm long and persistent. All leaves are submerged. The leaves are sessile. The lamina is 15–20 cm long, 2–3 cm wide, dark-green, broad and often slightly amplexicaul at the base. The apex is obtuse and cucullate. The margin is entire and undulate.
Flower
The inflorescence is a pedunculate spike. The peduncle is 8–20 cm long, thinner than the stem and evenly thick. The spike is typically 4–5 cm long. The flowers are bisexual. The perianth is four-leaved and calyx-like.
Fruit and seed
The fruit is drupe-like and 4.5–5.5 mm long.
The map represents observations of this taxon, but it may not be used as a distribution map.
- Total squares
- pitkälehtivita (Finnish)
- långnate (Swedish)
- AOV - spontaneous, old, resident
Vascular plants – SUMI Project 2022 ? Regionally Threatened 2020 - 3a Middle boreal, Ostrobothnia ?
- 2019 LC – Least Concern
- 2010 LC – Least Concern
- 2000 LC – Least Concern
- Pertti Uotila
- MVL.343
- Plant life forms
- MVL.1100
- Elodeids