Elatostema hybrida Y. H. Tseng & J. M. Hu
Creators: name: Tseng, Yu-Hsin
name: Hu, Jer-Ming
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Rosales
Urticaceae
Elatostema
Elatostema hybrida

description: Elatostema × hybrida Y. H. Tseng & J. M. Hu, hyb. nov. (Fig. 1 & Fig. 2)
Natural hybrid between E. lineolatum var. majus and E. platyphylloides. It differs from the parental species by the shallowly cordate leaf base or the distal half of the leaf base semi-sagitate with an auriculate limb not crossing the petiole to the opposite; acroscopic leaf margin with 7–13 teeth, basiscopic leaf margin 11–17.
TYPE: — TAIWAN. New Taipei City: Pingxi District, Sandiaoling, along a trail to Sandiaoling Water Trail, 25°03’38.92”N, 121°49’49.41”E, 180 m, 11 July 2009, Y. H. Tseng 1117 (holotype TAI!, isotype TAIF!).
Perennial monoecious herbs. Stems somewhat woody towards the base, erect or ascending, branched, up to 1 m high, ca. 0.8 cm thick, grey-brown, densely hispid, hairs 0.35–0.85 mm long, linear. Stipules 2, opposite, caducous, 9–13 mm long, 1–2 mm wide, lanceolate, greenish, ciliate. Leaves alternate, sessile or subsessile; lamina 7–18 cm long, 2.5–6 cm wide, asymmetrically oblong, chartaceous, pinnately nerved, the secondary vein 4–6 pairs; upper surface dark green to green, sparely strigose, hairs 0.4–0.9 mm long, linear, cystoliths densely distributed, 0.2–0.25 mm long, fusiform; lower surface pale-green, densely strigose, hairs 0.5–0.7 mm long, linear, cystoliths absent; apex acuminate, entire; base shallowly cordate or the distal half semi-sagitate with auriculate limb not crossing the petiole to the opposite side; margin serrate, the basal 1/3 to 1/2 entire, ciliate, teeth 7–13 on acroscopic margin, 11– 17 on basiscopic margin. Inflorescences unisexual. Staminate inflorescences 8–10 × 5–8 mm, discoid, with two ellipsoidal parts, greenish, puberulous, hairs 0.15–0.4 mm long, linear; peduncle ca. 0.3 mm, puberulous, hairs 0.3– 0.4 mm long, linear; receptacle 4–4.5 × 2–3 mm, broadly oblong to oblong; bracts 1–1.5 mm long, apex with a subulate horn-like projection; bracteoles numerous, 2–3 mm long, narrowly oblong, cymbiform, membranous, semihyaline, apex mucronate, ciliate, margin entire, minutely ciliate. Pistillate inflorescences sessile to subsessile, up to 6 × 6 mm in diameter, ellipsoidal-discoid, white-green, hirsute outside, hairs 0.45–0.8 mm long, linear; receptacle 3–4 × 1.5–2 mm, broadly ovate to ovate; bracts 0.5–0.8 mm long, connate, the basal two with a subulate horn-like projection; bracteoles numerous, 0.5–1 × 0.2–0.5 mm, oblong to ovate, membranous, semihyaline, apex mucronate, long ciliate. Staminate flowers subtended by bracteoles; pedicels 1–1.5 mm long, glabrous; sepals 4, narrowly triangular, apex ciliate; stamens 4, inflexed. Pistillate flowers subtended by bracteoles, 0.75–1 mm; sepals 3, minute; staminodes 3 or 4; stigma penicillate; ovary glabrous, straight, ellipisoidal. Fruit not seen. Chromosome number, 2 n = 26.
Etymology: —Named for the hybrid origin.
Distribution: — Taiwan, found in low to medium altitude moist forest where it can form an important component of the ground story and adjacent to trails. Only 5-30 individuals were observed in each population and each population occupied less than 3 m 2.
Additional specimens examined: — TAIWAN. New Taipei City: Wulai District, Bafu trail, 24°45’53.42”N, 121°30’23.82”E, ca. 600 m, 22 August 2009, Y. H. Tseng 1135 (TAI), Honghe valley, 24°52’33.84”N, 121°31’41.67”E, ca. 250 m, 13 December 2009, Y. H. Tseng 1157 (TAI). Taoyuan County: Fuxing Town, Dongman forest trail, 24°49’04.86”N, 121°25’22.06”E, ca. 900 m, 28 August 2010, Y. H. Tseng 1180 (TAI). Miaoli County: Dahu Town, Mt. Malabang, 24°22’04.05”N, 120°54’25.31”E, ca. 1000 m, 4 September 2010, Y. H. Tseng 1185 (TAI). Taitung County: Daren Town, Anshuo, 22°17’10.86”N, 120°50’18.30”E, ca. 200 m alt., 9 February 2011, Y. H. Tseng 1198 (TAI).
description: Published as part of Tseng, Yu-Hsin & Hu, Jer-Ming, 2014, A new hybrid from Taiwan, Elatostema × hybrida (Urticaceae), is the first confirmed natural hybrid for Urticaceae, pp. 43-60 in Phytotaxa 161 (1) on pages 52-53, DOI: 10.11646/phytotaxa.161.1.2, http://zenodo.org/record/5128774