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Descriptions

W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Yushania tianmushanica

HABIT Perennial. Rhizomes short; pachymorph. Culms erect; 100–250 cm long; 5–9 mm diam.; woody. Culm-internodes terete; hollow; 10–15 cm long; mid-green; distally mealy. Culm-nodes flush with internodes. Lateral branches dendroid. Branch complement several; with subequal branches; thinner than stem. Culm-sheaths persistent, or deciduous; green, or purple; pilose; with appressed hairs; with purple hairs; without auricles; setose on shoulders; shoulders with 4–7 mm long hairs. Culm-sheath ligule 2–5 mm high; lacerate and ciliate. Culm-sheath blade linear, or lanceolate; erect; glabrous on surface. Leaves (4–)5–6 per branch. Leaf-sheaths 3–3.3 cm long; glabrous on surface. Leaf-sheath oral hairs setose; 8 mm long. Ligule an eciliate membrane; 1–1.5 mm long; truncate. Leaf-blade base with a brief petiole-like connection to sheath. Leaf-blades linear, or lanceolate; 6–9 cm long; 7–10 mm wide. Leaf-blade venation with 8 secondary veins; with distinct cross veins. Leaf-blade surface glabrous.

INFLORESCENCE Inflorescence composed of racemes; comprising 9–11 fertile spikelets; subtended by bracts (1 bract).

Racemes 1; single; oblong; unilateral; 4–6 cm long.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 8–15 mm long; glabrous.

FERTILE SPIKELETS Spikelets comprising 2–3 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 13–22 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes glabrous.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume ovate; 3 mm long; chartaceous; without keels; 1 -veined. Lower glume lateral veins absent. Lower glume margins ciliate. Lower glume apex acuminate. Upper glume lanceolate, or ovate; chartaceous; without keels; 5–7 -veined. Upper glume apex attenuate.

FLORETS Fertile lemma lanceolate; 9–10 mm long; chartaceous; without keel; 7–9 -veined. Lemma apex acuminate; pubescent. Palea 5–7.5 mm long; 2-keeled. Palea keels eciliate. Palea apex dentate; 2 -fid. Apical sterile florets resembling fertile though underdeveloped.

DISTRIBUTION Asia-temperate: China.

NOTES Arundinarieae. Lai 2014.

Please cite this publication as detailed in How to Cite Version: 3rd February 2016.