E-Flora BC: Electronic Atlas of the Flora of British Columbia

Lythrum hyssopifolia L.
Hyssop loosestrife
Lythraceae (Loosestrife family)

Introduction to Vascular Plants
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Distribution of Lythrum hyssopifolia
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Species Information

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Annual herb from a fibrous root; stems erect, several, simple to branched, glabrous, obscurely 4-angled, 10-40 cm tall.
Basal leaves lacking; stem leaves alternate below or some opposite, linear to narrowly oblong, 1-2.5 cm long, 1-8 mm wide, tapered at the bases.
Inflorescence of solitary or paired, unstalked, axillary flowers; hypanthium 4-5 mm tall; petals 5, 6 or lacking, white to rose, 2-3.5 mm long; calyces with 4-6 teeth.
Capsules, elongate; seeds egg-shaped.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Moist disturbed areas in the lowland and steppe zones; rare in SW and SC BC, known only from Mud Lake (Oliver area) and Surrey; introduced from Europe.

Source: The Illustrated Flora of British Columbia


The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is not evaluated, unknown or variable.

Synonyms and Alternate Names

Lythrum adsurgens Greene
Lythrum hyssopifolia

Taxonomic and Nomenclatural Links

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General References