Myriophyllum alterniflorum
- Overview
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- Biology
- Taxonomy
- Occurrence
- Specimen
Growing form
Perennial submerged aquatic herb.
Size
50–100 cm long.
Stem
The stem is very slender, procumbent, with a reddish yellowish tint. Occasionally, there are individual short tubercles at the margin of the leaf bases.
Leaf
The leaves are arranged in whorls. A whorl consists of four leaves. The leaves are 1–2.7 cm long, reddish or bluish. The leaves are sessile. The lamina is pinnately parted. There are 3–9 pairs of lobes, arranged rather densely, and the lobes are typically short, thin and flaccid.
Flower
The inflorescence is emerged above water surface and drooping. The lowest flowers are arranged in whorls and the uppermost flowers are alternate. The most proximal flowers are located at the leaf axils. The flowers are sessile, small, unisexual. Each whorl of the flower consists of four floral leaves. The staminate flowers are located above the pistillate flowers. The bracts are shorter than the flowers and serrulate.
Fruit and seed
The fruit is a schizocarp. The mericarps are drupe-like.
The map represents observations of this taxon, but it may not be used as a distribution map.
- Total squares
- ruskoärviä (Finnish)
- hårslinga (Swedish)
- AOV - spontaneous, old, resident
Vascular plants – SUMI Project 2022 ? Regionally Threatened 2020 - 1a Hemiboreal, Åland ?
- 2019 LC – Least Concern
- 2010 LC – Least Concern
- 2000 LC – Least Concern
- Pertti Uotila
- Vascular plants
- Plant life forms
- Aquatic plants
- Elodeids