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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 wardii

HABIT Perennial. Rhizomes short; pachymorph. Culms 200–250 cm long; woody. Culm-internodes terete; solid; yellow. Lateral branches dendroid. Leaf-sheaths striately veined; smooth; glabrous on surface. Leaf-sheath oral hairs setose; 20–25 mm long. Leaf-sheath auricles falcate. Ligule an eciliate membrane. Leaf-blade base with a brief petiole-like connection to sheath; petiole pubescent. Leaf-blades deciduous at the ligule; lanceolate; 10–15 cm long; 9–18 mm wide; mid-green and glaucous; discolorous with last colour beneath. Leaf-blade venation with distinct cross veins. Leaf-blade surface smooth; glabrous. Leaf-blade margins scabrous. Leaf-blade apex attenuate; filiform.

INFLORESCENCE Inflorescence a panicle.

Panicle open; ovate; 3–9 cm long; 4 cm wide. Panicle axis glabrous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 2–3 fertile florets; with diminished florets at the apex. Spikelets linear; laterally compressed; 20–25 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 2–6 mm long; pilose; hairy above.

GLUMES Glumes persistent; similar; shorter than spikelet; similar to fertile lemma in texture. Lower glume linear; 2–5 mm long; herbaceous; without keels; 1 -veined. Lower glume lateral veins absent. Lower glume surface smooth; glabrous. Lower glume apex acuminate. Upper glume elliptic; 7–8 mm long; herbaceous; without keels; 3 -veined. Upper glume surface smooth; glabrous. Upper glume apex acuminate; awned; 1 -awned. Upper glume awn 1–1.5 mm long.

FLORETS Fertile lemma elliptic; 9–11 mm long; 3 mm wide; herbaceous; keeled; 5–7 -veined. Lemma midvein scabrous. Lemma lateral veins with cross-veins. Lemma surface puberulous. Lemma apex acute; awned; 1 -awned. Principal lemma awn 1–1.5 mm long overall. Palea 1 length of lemma. Palea keels scabrous. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2. Anthers 3; 6 mm long. Stigmas 3.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Asia-tropical: Indo-China.

NOTES Arundinarieae. Bor 2002.

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