Description from Flora of China
Lysimachia duclouxii Bonati; L. yunnanensis Franchet.
Herbs perennial, 25--30 cm tall. Stems ascending-erect to reclined, usually simple, with brown multicellular hairs. Lower leaves much smaller or scalelike. Upper leaves alternate or occasionally subopposite; petiole ca. 1/3 as long as leaf blade, villous; leaf blade ovate to elliptic-ovate, 2.2--3.2 X 1.5--1.8(--2.5) cm, pubescent, indistinctly short black glandular striate, base attenuate, apex acute; veins 2--4 pairs. Pedicel 5--7 mm, densely pubescent. Flowers solitary, axillary. Calyx lobes lanceolate, 4--5 X ca. 1.2 mm, costate, sparsely pubescent, short black glandular striate. Corolla yellow, 7--8 mm, deeply parted; lobes ovate, 6--7 X ca. 4.5 mm, densely black glandular striate, apex rounded. Filaments connate basally into a ca. 0.5 mm high ring, free parts ca. 0.6 mm; anthers triangular-ovate, indistinctly dorsifixed to nearly basifixed, opening by lateral slits, ca. 1.5 mm, erect. Ovary ovoid; style ca. 4 mm. Capsule subglobose, ca. as long as calyx. Fl. Jul.
* Dry grassy mountain slopes. C and N Yunnan.