| Dicotyledon | Literature for Urtica urens
Wagner et al., 1990, 1999. |
| Urticaceae -- The Cecropia, Nettle Family | Bibliography |
| Urtica urens | |
Common name(s): nettle, burning nettle, dog nettle, dwarf nettle |
| General Information | ||
|---|---|---|
| Distribution | Native to Eurasia, now a nearly cosmopolitan weed.In the Hawaiian Islands, naturalized on O`ahu, Hawai`i. |
|
| Habit |
Taprooted annual herbs; stems erect or ascending, unbranched or branched from base, 10-60(-80) cm long, glabrous or sparsely pubescent and with scattered, coarse, stinging hairs, hispidulous at nodes. |
|
| Leaves |
Leaves thin, elliptic to ovate, (2.5-)4-13 cm long, (0.7-)1.5-5.2 cm wide, often larger toward apex of stem, 3-5-nerved, glabrous except with scattered stinging hairs, margins coarsely laciniate-serrate, petioles 0.5-4.2 cm long, stipules oblong, 1-4 mm long. |
|
| Flowers |
Flowers in mixed clusters but predominantly pistillate, 0.5-2(-2.5) cm long; pistillate calyx 1.5-2.5 mm long in fruit, ± sparsely hispid, margins hispid-ciliate. |
|
| Fruit |
Achenes deltoid, 1.5-2.5 mm long, smooth to slightly roughened with punctate dots. |
|
| Chromosomes |
2n = 24, 26, 52 |
|