Abstract
Based on examination of specimens of Elatostema J. R. Forster & G. Forster (Urticaceae) from Vietnam, Elatostema albopilosum W.T. Wang var. vicinum L. D. Duan & Y. Lin, a new variety collected from Bac Can Province and Tuyen Quang Province, Vietnam, is described and photographed. This new variety has glabrous stems, glabrous leaves and glabrous peduncles which differs from var. albopilosum that having sparsely puberulent leaf blade on abaxial surface along veins and sparsely strigillose leaf blade on adaxial surface, and short pilose peduncles. E. integrifolium (D. Don) Wedd. and E. pseudodissectum W. T. Wang, two species previously known from Vietnamese adjacent countries, are newly recorded from Ninh Binh Province and Tam Dao National Park, Vietnam, respectively. The vouchers are kept in the Herbarium (PE) of Institute of Botany, Chinese Academy of Sciences, Beijing, China, and their descriptions and photographs are also provided.DOI: http://dx.doi.org/10.3329/bjpt.v21i1.19254Bangladesh J. Plant Taxon. 21(1): 27-32, 2014 (June)
Highlights
Forster is the largest genus in the family Urticaceae, consists of c. 500 species and is distributed in tropical and subtropical regions of Africa, Asia and Oceania, 30 species of which are found in Vietnam (Fu et al, 2013; Gagnepain, 1929; Ho, 2003; Lin, 2008; Lin et al, 2003, 2011; Wang, 1995, 2012)
Based on examination of Elatostema specimens housed at the Herbarium (PE) of Institute of Botany, Chinese Academy of Sciences, Beijing, China, and after thoroughly consulting the literature (Gagnepain, 1929; Lin, 2008; Bi et al, 2011; Lin et al, 2003, 2011; Wang, 1980, 1995, 2012; Duan and Lin, 2013; Wei et al, 2013), a new variety was found from Vietnam, and two species previously known from Vietnamese adjacent countries, were discovered to be new to Vietnam, and were reported here
Leaves alternate; nanophylls absent; stipules narrowly triangular, 0.7-1.5 × 0.2-0.4 mm, without cystoliths; petiole 1-3 mm long; leaf blade obliquely ovate or elliptic-ovate, 4-11 × 1.5-4.0 cm, membranous or herbaceous, major basal lateral veins both arising at base of leaf blade, cystoliths conspicuous, dense, 0.2-0.6 mm long; base obliquely cuneate, apex acuminate or cuspidate, margin denticulate
Summary
Based on examination of Elatostema specimens housed at the Herbarium (PE) of Institute of Botany, Chinese Academy of Sciences, Beijing, China, and after thoroughly consulting the literature (Gagnepain, 1929; Lin, 2008; Bi et al, 2011; Lin et al, 2003, 2011; Wang, 1980, 1995, 2012; Duan and Lin, 2013; Wei et al, 2013), a new variety was found from Vietnam, and two species previously known from Vietnamese adjacent countries, were discovered to be new to Vietnam, and were reported here. Male inflorescence solitary or in pairs, simple, 10-18 × 6-12 mm, sessile; receptacle 4-6 mm in diam.; bracts 4, triangular, equal, connate, c.
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