Stinging Nettle

Dmitry Geltman (pers. comm.) notes that U. dioica subsp. sondenii (Simmons) A. Löve & D. Löve (U. dioica var. sondenii Simmons; U. sondenii (Simmons) Avrorin ex Geltman) occurs in the mountainous regions of Xinjiang (Altay Shan, etc.).

Dioecious, perennial, 50-150 cm herb with a dense indumentum of stinging hairs. Stem angled. Leaves with 1.5-4 cm long petiole; lamina narrowly lanceolate to ovate, 5-12 cm long, 2.5-8 cm broad, cordate at the base, margin serrate, apex acute-acuminate; stipules free lateral, oblong-lanceolate, 8-12 mm long, ciliate. Racemes of cymes axillary, often longer than the subtending petiole, densely appressed pubescent, with scattered stinging hairs. Flowers pale-greenish, or whitish, bracteate; bracts of male flowers smaller than those of female flowers. Sepals pubescent. Achenes up to c. 1.5 mm long, ovoid-ellipsoid, pale green or greenish-brown.

Herbs , perennial, rhizomatous, 5-30 dm. Stems simple or branched, erect or sprawling. Leaf blades elliptic, lanceolate, or narrowly to broadly ovate, 6-20 × 2-13 cm, base rounded to cordate, margins coarsely serrate, sometimes doubly serrate, apex acute or acuminate; cystoliths rounded. Inflorescences paniculate, pedunculate, elongate. Flowers unisexual, staminate and pistillate on same or different plants, staminate ascending, the pistillate lax or recurved. Pistillate flowers: outer tepals linear to narrowly spatulate or lanceolate, 0.8-1.2 mm, inner tepals ovate to broadly ovate, 1.4-1.8 × 1.1-1.3 mm. Achenes ovoid to broadly ovoid, 1-1.3(-1.4) × 0.7-0.9 mm.

Herbs perennial, dioecious, rarely monoecious. Rhizomes woody, stoloniferous. Stems simple or few branched, 40-100 cm tall; stems and petioles often densely or sometimes sparsely covered with stinging and setulose hairs. Stipules free, linear, (2-)5-8 mm; petiole 2.5-4 cm; leaf blade ovate, sometimes lanceolate, 5-13 × 2.5-6 cm, often herbaceous, (3-)5-veined, lateral basal veins reaching distal margin and anastomosing, secondary veins 3-5 each side, adaxial surface sparsely covered with stinging and setulose hairs, abaxial surface often densely covered with long, stinging and setulose hairs along veins, base cordate, margin coarsely 15-21-serrate or -dentate, teeth often incurved-tipped, apex acuminate or long acuminate; cystoliths punctiform. Inflorescences paniculate, 3-7 cm; female inflorescences with slender axes, often drooping in fruit. Male flowers in bud ca. 1.4 mm; perianth lobes connate 1/2 of length, puberulent. Female flowers: perianth lobes connate at 1/4 of lower part, dorsal-ventral lobes elliptic-ovate, 1.2-1.5 mm, sparingly setulose, lateral lobes narrowly elliptic, 2-3 × as long as the dorsal ones, Achene brownish gray, ovoid or narrowly ovoid, slightly compressed, 1-1.2(-1.4) mm, smooth, invested by persistent perianth lobes. Fl. Jun-Aug, fr. Aug-Sep.

Europe, N. Africa, W. Siberia, C. Asia, Himalaya, Tibet, W. China, naturalised widely in other temperate regions.

Distribution: Widespread in the temperate regions of both hemispheres.

E Gansu, Qinghai, NW Sichuan, W Xinjiang, Xizang [Afghanistan, C Himalayas; N Africa, Europe, North America].

3000-4500 m

Fl. Per.: May-September.

Moist places in forests, thickets, grasslands, stream banks; (500-) 2200-5000 m.