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Descriptions

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

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

Phyllostachys aureosulcata

HABIT Perennial. Rhizomes elongated; leptomorph. Culms erect; 700–800 cm long; 30 mm diam.; woody. Culm-internodes semiterete; hollow; 35 cm long; retrorsely scabrous; distally mealy. Culm-nodes glabrous. Lateral branches dendroid. Culm-sheaths green and white, or yellow; striped; without auricles, or auriculate; setose on shoulders. Culm-sheath ligule 3–4 mm high; ciliolate. Culm-sheath blade triangular; erect, or reflexed; scabrid. Leaves cauline; 3–5 per branch. Leaf-sheath oral hairs lacking, or ciliate. Leaf-sheath auricles absent, or falcate. Ligule a ciliolate membrane; 1–1.5 mm long; pubescent on abaxial surface. Leaf-blade base with a brief petiole-like connection to sheath; petiole glabrous. Leaf-blades lanceolate; 15 cm long; 19 mm wide. Leaf-blade surface pilose; sparsely hairy; hairy abaxially. Leaf-blade margins scabrous. Leaf-blade apex acuminate.

INFLORESCENCE Synflorescence bractiferous; fasciculate; dense; with spathaceous subtending bracts; bracts 15–18 mm long; without axillary buds at base of spikelet; with ultimate bract subtending a compact bracteolate fascicle of spikelets; prophyllate below lateral spikelets.

Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 2 fertile florets; with diminished florets at the apex. Spikelets lanceolate; laterally compressed; 15 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes two; persistent; shorter than spikelet. Lower glume lanceolate; 7 mm long. Upper glume lanceolate; 10 mm long; chartaceous; 1-keeled. Upper glume apex acute.

FLORETS Fertile lemma elliptic; 10 mm long; chartaceous; without keel. Lemma apex acuminate; awned; 1 -awned. Principal lemma awn 1–2 mm long overall. Palea 1 length of lemma; chartaceous. Apical sterile florets distinct from fertile; rudimentary.

FLOWER Lodicules 3. Anthers 3. Stigmas 3.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Asia-temperate: China.

NOTES Arundinarieae. McClure 2002.

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