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Montana Field Guide

Montana Field Guides

Water Loosestrife - Lysimachia thyrsiflora

Global Rank: G5
State Rank: SNR

Agency Status
MNPS Threat Rank:
C-value: 8

External Links

General Description
Stems ascending, rooting at lower nodes, 20–70 cm. Leaves sessile, smaller below, narrowly lanceolate, 4–10 cm long, glandular-punctate. Flowers short-pedicillate in spike-like, bracteate, ellipsoid racemes, paired at leaf nodes on stalks 2–3 cm long; calyx 2–4 mm long, glandular; corolla campanulate, 4–7 mm long, the lobes linear, purple dotted. Capsule 2–3 mm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range

Range Comments
Widespread in boreal and temperate Northern Hemisphere.

Summary of Observations Submitted for Montana
Number of Observations: 5

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density



(Observations spanning multiple months or years are excluded from time charts)


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Citation for data on this website:
Water Loosestrife — Lysimachia thyrsiflora.  Montana Field Guide.  .  Retrieved on , from