Botanical name: Lysimachia japonica    Family: Primulaceae (Primrose family)
Synonyms: Lysimachia maculata, Lysimachia uliginosa, Anagallis pilosa

Swamp Loosestrife is a perennial herb with stems prostrate to decumbent, 10-30 cm, usually branched from base, with grayish multicellular hairs. Flowers are borne singly in leaf-axils. Flowers are yellow, 0.6-1.5 cm across, petals triangular-ovate. Sepals are lanceshaped, 7-8 mm long, velvet-hairy, generally longer than petals. Stamen filaments are fused below into a tube 3-4 mm, style 2-3 mm. Flower-stalks are 1.5-3.5 mm long, elongating in fruit. Leaves are opposite; leaf-stalk 2-5 mm, narrowly winged; leaf blade broadly ovate to nearly round, 1-4.5 x 0.7-2.5 cm, velvet-hairy, transparent glandular dotted, base rounded to almost flat, tip pointed to blunt; veins 2 or 3 pairs; veinlets not prominent. Capsules are nearly spherical, enclosed in sepals, 3-4 mm in diameter, velvet-hairy at tip. Swamp Loosestrife is found in Pakistan, Himalayas to Myanmar, China, Japan and Korea, at altitudes of 1000-2600 m. Flowering: June-August.

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The flower labeled Swamp Loosestrife is ...