22. Rumex trisetifer Stokes, Bot. Mat. Med. 2: 305. 1812.
长刺酸模 chang ci suan mo
?Rumex chinensis Campdera.
Herbs annual. Roots large. Stems erect, 30-80 cm tall, grooved, glabrous; branches spreading. Lower leaves: petiole 3-5 cm; leaf blade oblong or lanceolate-oblong, 8-20 × 2-5 cm, both surfaces glabrous, base cuneate, margin undulate, apex acute; cauline leaves shortly petiolate, narrowly lanceolate, smaller than basal ones; ocrea fugacious, membranous. Inflorescence terminal or axillary, racemose, several racemes aggregated and large panicle-like. Flowers bisexual. Pedicel slender, articulate near base. Outer tepals lanceolate, small; inner tepals enlarged in fruit; valves narrowly trigonous-ovate, 3-4 × 1.5-2 mm, all valves with tubercles, base truncate, margin with 1 pair of narrow teeth, apex narrowly acute; teeth 3-4 mm, straight. Achenes yellow-brown, shiny, ellipsoid, sharply trigonous, 1.5-2 mm, base narrow, apex acute. Fl. May-Jun, fr. Jun-Jul.
Field margins, moist valleys, water sides; sea level to 1300 m. Anhui, Fujian, Guangdong, Guangxi, Guizhou, Hainan, Hubei, Hunan, Jiangsu, Jiangxi, Shaanxi, Sichuan, Taiwan, Yunnan, Zhejiang [Bhutan, India, Laos, Myanmar, Thailand, Vietnam].