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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 anceps

HABIT Perennial; culms solitary. Rhizomes short; pachymorph. Culms erect; 4500 cm long; woody. Culm-internodes terete; hollow; 28 cm long; glaucous. Lateral branches dendroid. Branch complement three. Culm-sheaths 15 cm long; 3 times as long as wide; chartaceous; hairy on margins; truncate at apex; auriculate; setose on shoulders. Culm-sheath ligule ciliolate. Culm-sheath blade linear; reflexed; 2.5–6 cm long. Leaf-sheaths loose; keeled; striately veined; glabrous on surface. Leaf-sheath oral hairs scanty. Ligule an eciliate membrane; 0.5 mm long; truncate. Leaf-blade base asymmetrical; with a brief petiole-like connection to sheath. Leaf-blades deciduous at the ligule; lanceolate; 15 cm long; 18 mm wide. Leaf-blade midrib indistinct. Leaf-blade venation with 6–10 secondary veins; with distinct cross veins. Leaf-blade surface scabrous; rough abaxially; glabrous. Leaf-blade margins scabrous. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle.

Panicle open; ovate; 7 cm long. Panicle axis smooth.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 6–10 fertile florets; with diminished florets at the apex. Spikelets linear; laterally compressed; 45 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes clavate; 5 mm long; pubescent.

GLUMES Glumes persistent; similar; shorter than spikelet; similar to fertile lemma in texture. Lower glume ovate; 4 mm long; herbaceous; without keels; 3 -veined. Lower glume lateral veins with cross-veins. Lower glume surface pilose; hairy at apex. Lower glume apex acute. Upper glume ovate; 6 mm long; herbaceous; without keels; 5 -veined. Upper glume lateral veins with cross-veins. Upper glume surface pilose; hairy at apex. Upper glume apex acute.

FLORETS Fertile lemma ovate; 8 mm long; 3.5 mm wide; herbaceous; without keel. Lemma lateral veins with cross-veins. Lemma surface pilose; hairy above. Lemma margins ciliate. Lemma apex acute. Palea 8 mm long; 6 -veined. Palea keels ciliolate. Palea apex dentate; 2 -fid. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 3; membranous; veined; ciliate. Anthers 3; 2.5 mm long; anther tip apiculate. Stigmas 3. Ovary glabrous.

FRUIT Caryopsis with adherent pericarp; linear; trigonous; dark brown.

DISTRIBUTION Europe: northern and southwestern. Asia-tropical: India.

NOTES Arundinarieae. Seeth. & Kumar 2002.

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