Urtica fissa E. Pritz.

This species is widely distributed in the temperature areas of China. It is variable in its leaf margin: populations in Hubei, Shaanxi, and Sichuan have more palmately 3-partite or 3-lobed leaf blades.

Herbs perennial, monoecious or rarely dioecious. Rhizomes stoloniferous. Stems branched, 40-100 cm tall; stems and petioles densely puberulent and covered with spreading, stinging hairs. Stipules greenish, interpetiolar, connate, oblong-ovate or oblong, 10-20 mm, herbaceous, 10-20-ribbed, puberulent, with cystoliths, apex obtuse, petiole 2-8 cm; leaf blade dark greenish or greenish, broadly ovate, elliptic, 5-angled, or suborbicular in outline, 5-15 × 3-14 cm, submembranous or herbaceous, 5-veined, lateral basal veins reaching distal lobes, secondary veins 3-6 each side, adaxial surface sparsely armed with stinging and setulose hairs, abaxial surface densely light greenish pubescent and with stinging hairs on veins, base truncate or cordate, margin shallowly 5-7-lobed or palmately 3-lobed (irregularly 2-4-lobed again), lobes gradually enlarged distally, deltoid or oblong, 1-5 cm, dentate-serrulate, apex acuminate or acute; cystoliths botuliform or subpunctiform on both surfaces. Inflorescences unisexual, male inflorescences usually in proximal axils, paniculate with a few branches or sometimes subspicate, to 10 cm, longer than petioles; female ones in distal axils. Male flowers pedicellate, in bud ca. 1.4 mm; perianth lobes connate below middle, sparsely puberulent. Female perianth lobes connate at base, dorsal-ventral lobes suborbicular, setulose, lateral lobes suborbicular, ca. 4 times as short as dorsal ones. Achene light brownish, broadly ovoid or subglobose, slightly compressed, ca. 1 mm, conspicuously verrucose, invested by persistent perianth lobes. Fl. Jul-Oct, fr. Sep-Nov.

Anhui, Fujian, SE Gansu, Guangxi, Guizhou, Henan, Hubei, Hunan, S Shaanxi, C Yunnan, Zhejiang [Vietnam].

Partly shady, moist places in forests, thickets, along streams, roadsides; 100-2000 m.

Urtica pinfaensis H. Léveillé & Blin.

Urtica fissa is an upright perennial herb native to streams and rainforest of China.

It is monoecious, has both sex organs, and rarely has only one sex organ (dioecious)

Urtica fissa là loài thực vật có hoa trong họ Tầm ma. Loài này được E. Pritz. miêu tả khoa học đầu tiên năm 1900.