长叶酸模 chang ye suan mo

Rumex domesticus C. Hartman.

Herbs perennial. Stems erect, 60-120 cm tall, robust, glabrous, grooved, branched above middle. Basal leaves: petiole 5-15 cm; leaf blade oblong-lanceolate or broadly lanceolate, 20-35 × 5-10 cm, abaxially minutely papillate along veins, adaxially glabrous, base cuneate or rounded, margin slightly undulate to weakly crisped, apex acute or subacute; cauline leaves shortly petiolate, lanceolate, small, base narrowly cuneate, apex acute; ocrea fugacious, white, membranous. Inflorescence paniculate. Flowers bisexual. Pedicels slender, articulate below middle; articulation distinctly swollen in fruit. Inner tepals enlarged in fruit; valves broadly orbicular-reniform to orbicular-cordate, 5-6 × 6-7 mm, all without tubercles, sometimes 1 valve with small indistinct tubercle, net veined, base cordate, margin entire, apex obtuse. Achenes brown, shiny, narrowly ovoid, trigonous, 2-3.5 mm. Fl. Jun-Jul, fr. Jul-Aug. 2n = 60.

Moist valleys, forest margins, mountain slopes; 100-3000 m. Gansu, Hebei, Heilongjiang, Henan, Hubei, Jilin, Liaoning, Nei Mongol, Ningxia, Qinghai, Shaanxi, Shandong, Shanxi, Sichuan, Xinjiang [Japan, Russia; Europe; introduced in North America and occasionally in other regions of the world].