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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.
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| 1 |
Plants unisexual, staminate and pistillate flowers on different plants; leaf blades abaxially hispid, both surfaces with stinging hairs. |
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1a subsp. dioica |
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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. |
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(2) |
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| 2 (1) |
Stems glabrous or strigose, with a few stinging hairs; leaf blades abaxially glabrous or puberulent. |
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1b subsp. gracilis |
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Stems softly pubescent, also with stinging hairs; leaf blades abaxially tomentose to moderately strigose. |
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1c subsp. holosericea |
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Lower Taxa
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Treatments in Other Floras @ www.efloras.org
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