独子繁缕 du zi fan lu

Herbs perennial. Stems yellow, quadrangular, 50--80 (--120) cm tall, stout, shiny, pubescent with 1 or 2 rows of glandular hairs above. Leaves short or long petiolate, lanceolate or oblong-lanceolate to elliptic, 4--11(--23) × 1.2--2.5(--6) cm, broadest from middle to base, base nearly rounded, semiclasping, adaxially pubescent or glabrous, midvein raised, pale yellow, margin crisp, apex long acuminate. Flowers numerous, in paniculate cymes, bisexual or unisexual; bisexual flowers large, female flowers small; bracts lanceolate. Pedicel 2--9 mm, slender, densely glandular pubescent. Sepals 5, gray-green, ovate-lanceolate to linear-lanceolate, (3--)5--6(--8) × 1--2 mm, sparsely glandular pubescent, margin narrowed, dry, membranous, apex acuminate or rarely obtuse. Petals 5, 1/2--1 × as long as sepals, 2-cleft to middle; lobes sometimes sickle-shaped, apex acute. Stamens 5 or 10; filaments 5--6 mm; anthers yellow, ca. 0.3 mm in diam. Ovary ca. 2 mm, 1-loculed; ovules 3; styles 3, linear, ca. 4 mm. Seed 1 maturing per carpel, brown, globose, ca. 3 mm, somewhat rugulose or granular. Fl. Aug--Sep, fr. Sep--Oct. 2n = 36, 44, 52.

Forests, mixed forests, montane forests, grassland slopes; 1200--2900(--3300) m. Fujian, Guangdong, Guizhou, Hubei, Taiwan, Xizang, Yunnan, Zhejiang [Afghanistan, Bhutan, India, Japan, Kashmir, Myanmar, Nepal, Pakistan, Sikkim, Thailand, Vietnam].