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Descriptions

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

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

Pinga marginata

HABIT Perennial; caespitose; clumped loosely. Rhizomes short; pachymorph. Culms leaning; pendulous at the tip; 1500–2000 cm long; 10–25 mm diam.; woody; with aerial roots from the nodes. Culm-internodes terete; hollow; 35–50 cm long; mid-green; distally glabrous. Lateral branches dendroid; arising from mid culm. Bud complement 1. Branch complement two, or three; in a clump; with 1 branch dominant; thinner than stem. Culm-sheaths deciduous but leaving a persistent girdle (this rugose); 10–11 cm long; hairy on margins; auriculate; with obtuse auricles; with 2–3 mm high auricles; setose on shoulders; shoulders with 4–6 mm long hairs. Culm-sheath ligule entire, or ciliate. Culm-sheath blade ovate; narrower than sheath; erect; 6.5–7 cm long; 30–35 mm wide; glabrous on surface; acuminate. Leaf-sheath oral hairs ciliate; 10–15 mm long. Leaf-sheath auricles falcate; 0.5–1 mm long; obtuse. Ligule an eciliate membrane; 1 mm long. Collar with external ligule. Leaf-blade base asymmetrical; with a brief petiole-like connection to sheath. Leaf-blades deciduous at the ligule; lanceolate; 17–41 cm long; 17–33 mm wide. Leaf-blade surface glabrous. Leaf-blade apex acuminate.

INFLORESCENCE Synflorescence bractiferous; clustered at the nodes; in globose clusters; with spathaceous subtending bracts; with axillary buds at base of spikelet; prophyllate below lateral spikelets; leafless between clusters.

FERTILE SPIKELETS Spikelets comprising 5–7 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; 4–5 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes definite; sparsely hairy.

GLUMES Glumes two; persistent; similar; shorter than spikelet; similar to fertile lemma in texture. Lower glume ovate; 1.5–2.5 mm long. Lower glume apex acute. Upper glume ovate; 1.5–2.5 mm long. Upper glume apex acute.

FLORETS Fertile lemma ovate; 3.5–4.5 mm long; without keel. Lemma surface glabrous. Lemma apex acuminate. Palea 4–5 mm long. Palea apex acute.

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

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Asia-tropical: Papuasia.

NOTES Bambuseae. Widjaja 2002.

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