Lysimachia japonica


in J. A. Murray, Syst. Veg. ed. 14, 196. 1784 ,.

Common names: Japanese loosestrife
Treatment appears in FNA Volume 8. Treatment on page 313. Mentioned on page 310.

Stems prostrate to ascending, simple or branched proximally, 1–3 dm, pubescent; rhizomes very slender; bulblets absent. Leaves opposite or sometimes alternate near apex of stem; petiole 0.5–1.5 cm, pubescent; blade orbiculate to ovate or deltate, 1.5–4 × 0.7–2 cm, base rounded to truncate, slightly decurrent, margins entire, plane, pubescent, apex acute to obtuse, surfaces punctate, sparsely pubescent; venation pinnate-arcuate. Inflorescences axillary in distal leaves, solitary flowers. Pedicels 0.2–0.8 cm, pubescent. Flowers: sepals 5, calyx not streaked, 5–9 mm, pubescent, lobes narrowly lanceolate, margins thin; petals 5, corolla yellow, not streaked, rotate, 5–9 mm, lobes with margins entire, apex acute to rounded, stipitate-glandular; filaments connate, shorter than corolla; staminodes absent. Capsules 2.5–3 mm, not punctate, pubescent distally. 2n = 18, 20, 22 (all Asian).

Phenology: Flowering summer.
Habitat: Deciduous woods above bayous and mesic wooded ravines
Elevation: 0-50 m


V8 623-distribution-map.gif

Introduced; La., W.Va., e Asia (China, Japan).


Selected References


Lower Taxa