披针叶酸模 pi zhen ye suan mo

Rumex domesticus C. Hartman var. pseudonatronatus Borbás, Ertek. Term. Koreb. Mag. Tud. Acad. 11(18): 21. 1880.

Herbs perennial. Roots vertical, large, 1-2 cm in diam. Stems erect, 80-120 cm tall, simple or branched above, grooved, glabrous. Basal leaves lanceolate or narrowly lanceolate, sometimes lanceolate-linear, 15-30 × 1.5-4 cm, abaxially minutely papillate along veins, adaxially glabrous, base cuneate to narrowly cuneate, margin crisped or undulate, apex acute; cauline leaves shortly petiolate, narrowly lanceolate, small; ocrea fugacious, white, thinly membranous. Inflorescence paniculate, dense in distal part, sometimes interupted at base, 20-40 cm, narrow. Flowers bisexual. Pedicels slender, articulate below middle, articulation swollen in fruit. Inner tepals enlarged in fruit; valves nearly orbicular or orbicular-cordate, 3.5-4.5 mm, all without tubercles, sometimes 1 valve with 1 indistinct tubercle less than 1-1.3 mm, conspicuously net veined, base slightly cordate, margin entire or weakly erose, apex obtuse. Achenes brown, shiny, narrowly ovoid, trigonous, 2-2.5 mm. Fl. Jun-Jul, fr. Jul-Aug. 2n = 40.

Forest margins on mountain slopes, moist valleys; 300-3200 m. Gansu, Hebei, Heilongjiang, Jilin, Qinghai, Shaanxi, Xinjiang [Kazakhstan, Kyrgyzstan, Mongolia, Russia; Europe; locally naturalized in North America].