Urtica fissa, E. Pritz. ex Diels, 1900

Becker, Karin, Grosse-Veldmann, Bernadette & Weigend, Maximilian, 2017, Weeding the nettles VI: Taxonomic and phylogenetic studies of the Southeast Asian Urtica fissa-clade (Urticaceae), Phytotaxa 323 (3), pp. 217-236 : 222

Key to the species of the Urtica fissa -clade present in Asia

1. Leaf margin with one order of dentation, older leaves occasionally with two orders of dentation; vegetative basal part of the plant with conspicuously more stinging hairs than the reproductive part ......................................................................... Urtica parviflora

- Leaf margin serrate, lobulate or palmately lobed; vegetative basal part of the plant not with conspicuously more stinging hairs than the generative part..............................................................................................................................................................................2

2. Leaf margin with two orders of serration, major teeth 1–2 mm long, minor teeth 0.5–1 mm long.................... Urtica himalayensis

- Leaf margin lobulate or palmately lobed with one or two orders of dentation, major teeth or lobes more than 2 mm long.............3

3. Leaf base ovate to cordate, leaf margin lobulate with one or two orders of dentation, 12–20 major teeth on each side, major teeth with 1–3 minor teeth ca. 1–2 mm long............................................................................................................... Urtica grandidentata a. Major teeth 5–15 mm long, with 1–3 minor teeth on each side, leaf base cordate ........................................ subsp. grandidentata b. Major teeth ca. 5 mm long, with 1–2 minor teeth on each side, leaf base ovate....................................................... subsp. lombok

- Leaf base subcordate to rounded, leaf margin lobulate with 8–15 major teethon each side or palmately lobed with 2–6 lobes on each side, lobe margins with two orders of dentation........................................................................................................................4

4. Leaf margin lobulate with two orders of dentation, 8–15 major teeth on each side, 2–10 mm long, major teeth with 2–4 minor teeth on each side, minor teeth 0.5–2 mm ............................................................................................................................... Urtica mairei

- Leaf margin palmately lobed with 2–6 large lobes on each side, lobes 5–50 mm long, lobe margins with two orders of dentation, 2–15 teeth on each lobe side, teeth 1–15 mm .................................................................................................................... Urtica fissa