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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 niitakayamensis

HABIT Perennial; caespitose. Rhizomes short; pachymorph. Culms erect; 100–400 cm long; 5–30 mm diam.; woody; with aerial roots from the nodes. Culm-internodes terete; hollow; 10–30 cm long. Lateral branches dendroid. Branch complement three, or several. Culm-sheaths coriaceous; brown; antrorsely scabrous; pilose; hairy on margins; setose on shoulders. Culm-sheath blade linear; glabrous on surface. Leaves 3–10 per branch. Leaf-sheaths 2.5–5 cm long; glabrous on surface. Leaf-sheath oral hairs setose. Ligule an eciliate membrane; truncate, or obtuse. Leaf-blade base with a brief petiole-like connection to sheath; petiole 0.1–0.2 cm long. Leaf-blades deciduous at the ligule; lanceolate; 4–18 cm long; 5–13 mm wide. Leaf-blade venation with 6–8 secondary veins; with distinct cross veins. Leaf-blade margins scabrous. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence comprising only a few spikelets; comprising 2–3 fertile spikelets; terminal and axillary.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 2–7 fertile florets; with diminished florets at the apex. Spikelets linear; laterally compressed; 20–40 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes persistent; similar; shorter than spikelet; similar to fertile lemma in texture. Lower glume ovate; 4–6 mm long; herbaceous; without keels. Lower glume apex acute. Upper glume ovate; 4–6 mm long; herbaceous; without keels. Upper glume apex acuminate.

FLORETS Fertile lemma ovate; 8–12 mm long; herbaceous; without keel; 7–9 -veined. Lemma apex acuminate. Palea 8–9 mm long; 8 -veined. Palea keels ciliolate. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 3; obovate; 1.2–1.8 mm long; membranous; veined; ciliate. Anthers 3; 8 mm long. Stigmas 2(–3).

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Asia-temperate: eastern Asia. Asia-tropical: Malesia.

NOTES Arundinarieae. Lin. 2002.

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