Pseudosasa oblongula (C.H.Hu) N.H.Xia & X.Li, 2023

Li, Xing, Ni, Jing-Bo & Xia, Nian-He, 2023, The identity of Sasa oblongula C. H. Hu (Poaceae, Bambusoideae, Arundinarieae): evidence from morphology and molecular data, PhytoKeys 226, pp. 17-32 : 17

Pseudosasa oblongula (C.H.Hu) N.H.Xia & X.Li comb. nov.

Figs 1 , 2 , 3

Sasa oblongula C. H. Hu, J. Bamboo Res., 6(4):18 (1987). Basionym.

Type.

China. Guangdong: type locality unknown, cultivated in Bamboo Garden, Sun Yat-sen University , 5 April 1980, Y. L. Yang & C. H. Hu 198001 (holotype: N, photo!; isotypes: N019023154, Fig. 1A ; N019023155, image!; N019023156, Fig. 1B )

Description.

Shrubby bamboo, rhizomes leptomorph. Culm erect, 1-1.5 m tall, 2-7 cm in diameter; branches appressed, usually 1 branch at the lower culm nodes and 2-3 at the mid or upper nodes of culm (if 3 branches, central slightly dominant than lateral); internodes terete or slightly flattened above branches, 5-27 cm long, glabrous, nearly solid; nodes flat or slightly prominent, white powdery under nodes; supranodal ridge flat or slightly prominent; intranodes 5-8 mm high, glabrous; culm buds solitary, ovate to elliptic, light yellow, puberulent abaxially at upper part, ciliolate on the upper margin, apex obtuse. Culm leaf sheath persistent or deciduous later, intravaginal, thinly leathery, 1/3-2/3 as long as internodes, glabrous abaxially, ciliate on the upper margin and sometimes glabrescent, longitudinal ribs conspicuous; sheath scar with remains of sheath base; auricles falcate to long-elliptic, obliquely ascending, 2-4 × 1-2 mm; oral setae erect or slightly curved, 3-10 mm long; ligule entire, 0.5-1 mm high, asperous abaxially, ciliolate on the margin, apex arched; blades narrowly lanceolate to lanceolate, erect, glabrous abaxially, margin sparsely serrate. Foliage leaves 3-6 clustered at the top of ultimate branches, with irregular arrangement; sheath thinly leathery, glabrous abaxially, margins densely ciliate, sometimes glabrous, thinly white-powdery, longitudinal ribs conspicuous, length per adjacent sheath apex very short, 1-4 mm; auricles undeveloped, ovate to falcate or absent, 1-3 × 1-1.5 mm; oral setae erect or curved, 5-10 mm long, usually deciduous when old; inner ligule 0.5-1 mm high, densely ciliolate on margin, apex truncate; outer ligule ca. 0.5 mm high, ciliolate on margin; blades oblong to oblong-lanceolate, papyraceous, 7-10 × 1.5-2.6 cm, glabrous adaxially and abaxially, apex acute to attenuate, base obtuse to unequal rounded, margin serrate; secondary veins 6-7 pairs, tertiary veins 6-7 pairs, transverse veins conspicuous; petioles 2-4 mm long, glabrous; Inflorescence unknown.

Phenology.

New shoots were produced from March to July.

Vernacular names.

Jǔ Yè Shǐ Zhú (Chinese pronunciation); 矩叶矢竹 (Chinese name).

Additional specimens examined.

Pseudosasa oblongula : China. Guangdong: type locality unknown, cultivated in Bamboo Garden, Sun Yat-sen University , 12 April 1979, T. H. Wen & G. Y. Sheng 79413 (JSB518673 image!); Yunfu City , Yunan County, Baishi Town , Hengjing village , 4 July 2021, N. H. Xia XNH-187 (IBSC!); ibid. 22°52'8"N, 111°51'59"E, elev. 206 m, 11 June 2022, J. B. Ni & X. Li LX142 (IBSC!). Pseudosasa cantorii : China. Hong Kong: Lantau Island, Cantor s.n., quoad foliage leaf (K000876243, image!); Green Island , 1 May 1981, L. C. Chia et al. Nan-zhu 2875 ( US 00031256, image!); Shatin, Siu Lek Yuen, 18 Oct. 1980, L. C. Chia et al. Nan-zhu 2823 ( US 00031257, image!); ibid. L. C. Chia et al. Nan-zhu 2830 ( US 00031259, image!); Xinjie, Jiadaoli Farm, 22 April 1981, Nan-zhu 2867 (IBSC!); ibid. 15 October 1980, Nan-zhu 2810 (IBSC!) .

Figures

Figure 1. Isotypes of Pseudosasa oblongula, Y. L. Yang & C. H. Hu 198001 (A N 019023154 B N 019023156). Photos downloaded from Chinese Virtual Herbarium (https: // www. cvh. ac. cn /).

Figure 2. Pseudosasa oblongula (C. H. Hu) N. H. Xia & X. Li, N. H. Xia XNH- 187 (IBSC). Photo by Xing Li.

Figure 3. Pseudosasa oblongula (C. H. Hu) N. H. Xia & X. Li A habit B foliage leaf, showing oblong blade C part of terminal branch, showing sheath and ligule D partial culm and branches E nodes of the upper culm, showing three branches complement F culm bud G, H culm leaf, showing lanceolate blades, falcate auricles and glabrous sheath I leptomorph rhizomes. Photos E, F by Zhuo-yu Cai, others by Xing Li.