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FNA | Family List | FNA Vol. 3 | Urticaceae | Urtica

1. Urtica dioica Linnaeus, Sp. Pl. 2: 984. 1753.

Stinging nettle, ortie

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.

1 Plants unisexual, staminate and pistillate flowers on different plants; leaf blades abaxially hispid, both surfaces with stinging hairs.   1a subsp. dioica
+ Plants unisexual, staminate and pistillate flowers mostly on same plants; leaf blades abaxially bearing stinging hairs, otherwise glabrous, puberulent, or tomentose and moderately strigose, adaxially without (rarely with a few) stinging hairs.   (2)
2 (1) Stems glabrous or strigose, with a few stinging hairs; leaf blades abaxially glabrous or puberulent.   1b subsp. gracilis
+ Stems softly pubescent, also with stinging hairs; leaf blades abaxially tomentose to moderately strigose.   1c subsp. holosericea

Lower Taxa


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