万年乔 wan nian qiao

Polygonum urophyllum Bureau & Franchet, J. Bot. (France) 5: 150. 1891; Fagopyrum mairei (H. Léveillé) H. Gross; P. mairei H. Léveillé.

Subshrubs. Stems suberect, 60-90 cm tall, much branched; branches ligneous, bark red-brown, exfoliating, simple, herbaceous, green striate. Petioles 2-5 cm, shortly pubescent; leaf blade greenish abaxially, green adaxially, sagittate or ovate-triangular, 2-8 × 1.5-4 cm, both surfaces shortly pubescent along veins, base broadly sagittate, margin entire, apex long acuminate or caudate; ocrea brown, 4-6 mm, membranous, oblique. Inflorescence terminal, paniculate, 15-20 cm; branches spreading, lax; bracts greenish, narrowly funnel-shaped, 2-2.5 mm, apex acute, each 3- or 4-flowered. Pedicels longer than bracts, 3-3.5 mm, slender, apex articulate. Perianth white; tepals elliptic, 2-3 mm. Stamens included. Styles free; stigmas capitate. Achenes exceeding persistent perianth, black-brown, shiny, broadly ovoid, sharply trigonous, 3-4 mm. Fl. Apr-Sep, fr. May-Nov.

* Grassy or gravelly slopes, thickets in valleys; 900-2800 m. Sichuan, Yunnan.