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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 longiuscula

HABIT Perennial; caespitose. Rhizomes short; pachymorph. Culms erect; 400–500 cm long; 10–20 mm diam.; woody. Culm-internodes terete; solid; 30–45 cm long. Lateral branches dendroid. Bud complement 1. Branch complement several. Culm-sheaths persistent; 15–21 cm long; coriaceous; pilose; without auricles; setose on shoulders. Culm-sheath ligule 1 mm high. Culm-sheath blade lanceolate; reflexed; 3–8.5 cm long; 2–3.5 mm wide. Leaves 2–4 per branch. Leaf-sheaths 5.5–7 cm long; glabrous on surface. Leaf-sheath oral hairs scanty; 2–7 mm long. Leaf-sheath auricles absent. Ligule an eciliate membrane; 1 mm long; truncate. Collar with external ligule. Leaf-blade base cuneate; with a brief petiole-like connection to sheath; petiole 0.3–0.4 cm long; petiole glabrous. Leaf-blades lanceolate; 7.2–19 cm long; 15–20 mm wide. Leaf-blade venation with 8–10 secondary veins; with distinct cross veins. Leaf-blade surface glabrous. Leaf-blade apex attenuate.

INFLORESCENCE Inflorescence a panicle; bracteate at branch bases.

Panicle open; 7–10 cm long.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 18–50 mm long; glabrous.

FERTILE SPIKELETS Spikelets comprising 4–10 fertile florets; with diminished florets at the apex. Spikelets linear; laterally compressed; 20–40 mm long; 3.5–5 mm wide; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 3.5–5 mm long; pubescent; hairy above.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume ovate; 4–8 mm long; herbaceous; without keels; 3–4 -veined. Lower glume apex acuminate. Upper glume ovate; 8–12 mm long; herbaceous; without keels; 5–7 -veined. Upper glume lateral veins prominent. Upper glume apex acuminate.

FLORETS Fertile lemma ovate; 10–16 mm long; herbaceous; without keel. Lemma surface glabrous. Lemma apex acuminate. Palea 6–9 mm long. Palea surface glabrous. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 3; membranous. Anthers 3; 4–6 mm long. Stigmas 2. Ovary glabrous.

FRUIT Caryopsis with adherent pericarp; fusiform; apex unappendaged. Embryo 0.2 length of caryopsis. Hilum linear.

DISTRIBUTION Asia-temperate: China.

NOTES Arundinarieae. Yi 2002.

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