Scientific name: Potamogeton berchtoldii Fieber
Common name: Small Pondweed
Description
Habit: Aquatic perennials. Stems scarcely compressed. Rhizome absent; winter-buds terminating long or short lateral branches. Hybrids are rather frequent in this genus.
Leaves: Leaves mostly alternate, some opposite, submerged, subtending inflorescences, all with membranous sheath or stipules; submerged leaves linear, grass-like, 1-2mm wide, 3-veined, usually acute, not bordered by a marginal vein at the tip; stipules open, convolute, membranous or somewhat herbaceous, with free, but often overlapping margins, 0.5-1.5cm.
Flowers: In spikes or heads; spike few-flowered, very short; peduncle slender; usually borne above the water-surface; perianth of 4 free, greenish segments; carpels usually 4, free; stamens 4, anthers stalkless, attached to the base of the adjoining perianth-segment.
Fruits: Drupes or achenes, 1 or more present, 2-3mm, with thick pericarp, soft on outside but with bony inner layer.
Habitat: Still or slowly moving water of all kinds.
Distribution: Very frequent.
Native status: Native
Of conservation interest: No