Urtica thunbergiana Sieb. & Zucc. subsp. dentata, Becker, Karin, Grosse-Veldmann, Bernadette & Weigend, Maximilian, 2017

Becker, Karin, Grosse-Veldmann, Bernadette & Weigend, Maximilian, 2017, Weeding the nettles V: Taxonomic and phylogenetic studies of the eastern Asian species Urtica thunbergiana Sieb. & Zucc. (Urticaceae), Phytotaxa 323 (3), pp. 201-216 : 209

1.2 Urtica thunbergiana Sieb. & Zucc. subsp. dentata (Hand.-Mazz.) K.Becker & Weigend, comb. nov. & stat. nov.,

Fig. 3

≡ Urtica dentata Hand. -Mazz. (1929: 112) = Urtica laetevirens Maxim. subsp. dentata (Hand.-Mazz.) C.J. Chen (1983: 115). Type:— CHINA. Hupeh: Mar. 1889, A. Henry 5859 (lectotype (here designated) HUH!, isolectotype K! (K_000694846)). Syntypes:— CHINA. Hupeh: 1885–1888, A. Henry 5401 (NY! (NY_00284487), US! ( US _01107870), HUH!, K! (K_000694845!); Hunan: In monte Yün-schan prope urbem Wukang, Apr. 1919, Handel-Mazzetti 262 (P! (P_06855739), K! (K000694844)).

= Urtica pachyrrhachis Hand. -Mazz. (1929: 113). Type:—[ China] Hunan austro-occ.: In monte Yün-schan prope urbem Wukang, 12 Jun.1918, Handel-Mazzetti 12099 (holotype WU! (WU_0035448)).

Nodes with 4 free stipules; leaf lamina 45–90 × 20–50 mm, teeth 2–4 mm long, teeth pointed and detached, leaf base rounded to cordate; heteroblasty occasionally developed with the basal leaves nearly as long as broad and with a cordate base and the apical leaves nearly three times longer than wide and with a rounded to attenuate base.

Distribution and Habitat: — U. thunbergiana subsp. dentata is restricted to central and SW China and is here reported from Guizhou, Hunan, Hupeh, Sichuan and Yunnan. The subspecies occurs on roadsides, in the understory of forests growing in rich and moist soil, near streams, and is usually found at intermediate elevations.

Phenology:— U. thunbergiana subsp. dentata flowers throughout the year.

Conservation status: —Using IUCN criteria ( IUCN 2016), Urtica thunbergiana Sieb. & Zucc. subsp. dentata (Hand.-Mazz.) K.Becker & Weigend is considered “Least Concern” (LC).

Representative specimens:— CHINA. Guizhou: Leijinag, E 118°9’40’’, N26°23’30’’, 24 May 1965, W. Zhang & Y. Ma 50358 (KUN_0523685!) ; Hunan: In monte Yün-schan prope urbem Wukang , 400–1400 m, Mar. 1919 Wang-Te-Hui s.n. (WU_0035446! & K_000694844!) ; in monte Yün-shan prope urbem Wukang , 400–1400 m, 1974, Wang-Te-Hui 262 (P_06855739!) ; in monte Yün-shan prope urbem Wukang, in silva elata frondosa umbrosa in valle ad septentr. templi Gwanyin-gp versus Wulingan descendente, ca. 1000 m, 12 Jun. 1918, H.R.E. Handel-Mazzetti 2499 (WU_ 0035448!) ; Shangpai, Yangming Mountain National Forestpark, Yangming Mountain , 1400 m, shady place in open forest in a valley, 10 to 12 Apr. 1942, S.H. Chun 685 (MO_04154107!) ; Xining Co. 26.4N, 110.8E, in woods, 1200 m, 10 May 1996, L. Chong-chun 1347 (MO_05087041!, HUH!, P_06820975!, PRE!) ; Yongshun, Brook Nature Reserve , riverside in evergreen broad-leaved forest 480–520 m, 27 May 1988, Beijing Team 0173 (KUN_0571676!) ; Yongzhou, Lingling, Mt. Yangming , in the spare woods of a valley, 1400 m, 12 Apr. 1942, S. Chen 685 (MO_04119815!) ; Hupeh : 1885–1888, A. Henry 5401 (HUH! & NY_00284487! & US _01107870!) ; 1885–1888, A. Henry 5859 (HUH!); Enshi Prefecture, Lichuan, Mao Peak , in grooves, 14 Apr. 1973, H.G. Li 11110 (MO_04503446!) ; Mar. 1889, A. Henry 5401 (K_000694845!); Mar. 1889, A. Henry 5859 (K_000694846!); Sichuan: Between rocks, 1400 m, 20 Jun. 1958, T. Dai 100932 (MO_04476384!) ; Chengtu, At the side of forest, 09 May 1928, W.P. Fang 13566 (KUN_0523682!) ; Kuanhsien, Mt. Tsing-chen , 09 May 1939, W.P. Wang 13565 (HUH_00278008!) ; Luding, Moxi, roadside, 3200 m, 13 Sep. 1980, Chengdu Institute of Biology , Chinese Academy of Science 23542 (CDBI_0017408!) ; Nanchuan Co. 29.1° N, 107.0° E, 730 m, by the river, 11 Apr. 1996, L. Zheng-yu 15565 (MO_5309133!, HUH_00240985!, P_06820976!) ; Nanchuan Co. 29.1° N, 107.0° E, 750 m, by the road, 11 Apr. 1996, L. Zheng-yu 15572 (MO_5309129! & HUH_ 00240986!) ; South of Kuan Hsien , in ravine, 1130 m, 19 Apr. 1930, F.T. Wang 20549 (HUH_00278017!) ; Tchen Keou Tin [nowadays: Chengkou], 1895–1897, Fargens s.n. (P_06855888!) ; Xiangchen Xian, Niding: Base of Rizhou Mountain behind village of Niding , in west-opening gorge, 20°5’26’’N, 99°40’29’’E, 3450 m, cut over mixed conifer forest in limestone gorge, boulder field on slope in mixed sun-shade of shrubs and Picea , 16 Jul. 1998, D.E. Boufford, B. Bartholomew, C.Y. Chen, M.J. Donoghue, R.H. Ree, H. Sun & S.K. Wu 28908 (MO_5766519! & HUH_00240988!) ; Yunnan: Ngaala , Tsa-wa-rung, stream side, 3600 m, Aug. 1935, C.W. Wang 66066 (HUH_00278010!) ;— Unidentified localities: 1887, Drake 2838 (P_06855915!)

Figures

FIGURE 3. Urtica thunbergiana subsp. dentata: A. Habit (Henry 5401), B. Node with free stipules (Luo 1347), C. Female inflorescences (Boufford et al. 28908), D. Male inflorescences (Boufford et al. 28908), E. Infructescence (Luo 1347), F. Basal leaf with a cordate base, nearly as long as broad (Henry 5859), G. Apical leaf with a rounded to attenuate base, nearly three times longer than broad (Henry 5401). Scale bars:A = 5 cm; B–G = 1 cm.