Arundinella yunnanensis Keng

Tian, Yu-Wei, Zhang, Xie-Yong, Yan, Ping & Chen, Wen-Li, 2025, Arundinella mainlingensis (Poaceae), a new species from Xizang, China, PhytoKeys 257, pp. 65-78 : 65-78

2. Arundinella yunnanensis Keng in B. S. Sun & Z. H. Hu, Acta Bot. Yunnanica 2 (3): 326. 1980.

Arundinella yunnanensis Keng , Claves Gen. Sp. Gram. Prim. Sinic. 130. 1957, nom. inval.; Illus. Fl. China: Gramineae 730. fig. 678. 1959, nom. inval.

Type.

China • Yunnan, Gongshan, Suroula , hillside meadows, 3000 m elev., Oct 1935, C. W. Wang 66574 (holotype: PE 00261943 !; isotypes: A 00023142 [image!]; NAS 00566677 [image!] and 00515176 [image!]) .

Description.

Perennials, loosely tufted. Culms 30–60 cm tall, 1–1.5 mm in diam., smooth and glabrous, with 4–7 nodes. Leaf sheaths glabrous; ligules shorter than 0.1 mm, nearly absent; basal blades 5–8 cm long, 1–3 mm wide, firm, flat or with involute margins, glabrous or occasionally with tubercle-based hairs; cauline blades 7–12 cm long, 2–4 mm wide. Panicles 10–15 cm long, contracted. Spikelets 4.5–5.2 mm long, 2 - flowered, purple, glabrous, in pairs with one long-pedicelled, the pedicel 3 mm long and one short-pedicelled, the pedicel ca. 1 mm long; lower glumes ca. 3.5 mm long, 3 - veined, ovate-lanceolate; upper glumes 4.2–5 mm long, 5 - veined; lower florets ca. 4 mm long, staminate; lemmas 5 - veined; upper florets ca. 3 mm long; lemmas of the upper floret slightly scabrid on back, 5 - veined, apex awned, the awns ca. 3.5 mm long, geniculate with brown twisted column; paleas slightly longer than lemma; anthers 1.8–2 mm long, purplish-red. Caryopses ca. 1.6 mm long, obovate-oblong, brownish.

Distribution and habitat.

Found only in China in Gongshan, Yunnan, growing in hillside meadows at an elevation of 3000 m.

Phenology.

Flowering and Fruiting from July to September.