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Tufted Loosestrife

Tufted Loosestrife

Lysimachia thyrsiflora

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How common: Very common

Tufted Loosestrife is a wetland plant with small yellow flower tufts spaced along the stem. It grows 20–70 cm tall with a straight, often brownish‑red stem and narrow paired leaves. You’ll see it in shallow water and on muddy shores, ditches and fens.

Did you know?

  • The petal tips are often dotted dark red to black.
  • Flowers may have 6 or 7 petals.

About the species

Identification

Upright plant 20–70 cm tall, usually unbranched, the stem often brownish‑red. Leaves sit in pairs, narrow and pointed, with dark speckles; the upper ones may slightly clasp the stem. Small yellow flowers (petals about 4–5 mm) form dense tufts at the base of the upper leaves along the stem. Petal tips often have red‑black dots, and the pollen threads stick out beyond the petals. After flowering, it makes tiny round seed cases (about 2–3 mm). Unlike other yellow loosestrifes with big heads at the stem top, this species has many side tufts. Flowers in Finland from June to August.

Plant group

Herbaceous plants

Habitat

shore

Flowering

Jun–Aug

About the habitat

Grows in shallow water and very wet ground: lake and river edges, slow streams, ditches, open fens and swampy woods. Common across most of Finland; rare in northernmost Lapland.

Sources

Photo: Agnieszka Kwiecień, Nova, CC BY-SA 4.0 https://commons.wikimedia.org/wiki/File:Lysimachia thyrsiflora Tojeść bukietowa 2023-06-08 02.jpg

Text: Pinkka: BIO-503 Suomen kasvisto ja kasvillisuus - Sisävedet: humusjärvet, CC BY 4.0 https://laji.fi/taxon/MX.38674

Text: Wikipedia (Finnish), CC BY-SA 4.0 https://fi.wikipedia.org/wiki/Terttualpi

See also