Lysimachia siamensis Bonati

Herbs perennial, 15--35 cm tall. Stems prostrate, ascending, often branched in upper part, with grayish brown multicellular hairs. Leaves opposite, upper 2 pairs ± crowded; petiole 1/3--1/2 as long as leaf blade, narrowly winged, pilose; leaf blade ovate to elliptic-ovate, 1.5--4 X 1--2.2 cm, with multicellular hairs, base broadly cuneate, apex acute. Inflorescences at apex of stems and branches, in loose or compact capitate clusters, 2--4-flowered. Pedicel 3--8 mm, densely pubescent. Calyx lobes lanceolate, 6--7 mm, abaxially pilose. Corolla yellow; tube ca. 2 mm; lobes elliptic to elliptic-lanceolate, 0.9--1.2 cm, epunctate, apex acute. Filaments connate basally into a ca. 2.5 mm high tube, free parts 2--3 mm; anthers dorsifixed, opening by lateral slits, 1.6--1.8 mm. Ovary pubescent apically; style ca. 7 mm. Capsule globose, shorter than persistent calyx. Fl. Apr-May.

S Yunnan [Myanmar, Thailand, Vietnam]

Grassy mountain slopes; 300--500 m.

Lysimachia siamensis là một loài thực vật có hoa trong họ Anh thảo. Loài này được Bonati mô tả khoa học đầu tiên năm 1913.

泰国过路黄（学名：Lysimachia siamensis）是报春花科珍珠菜属的植物。分布于越南、泰国、缅甸以及中国大陆的云南等地，生长于海拔300米至500米的地区，多生于山坡路边或草丛中，目前尚未由人工引种栽培。