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Descriptions

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

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

Arundo formosana

HABIT Perennial. Rhizomes elongated. Culms decumbent; reed-like; 50–150 cm long; 2–6 mm diam. Culm-internodes hollow. Culm-nodes glabrous. Lateral branches ample. Leaves cauline. Leaf-sheaths longer than adjacent culm internode; pilose. Ligule a ciliolate membrane; 0.5–1 mm long. Leaf-blades lanceolate; 10–25 cm long; 5–15 mm wide. Leaf-blade surface smooth; pilose. Leaf-blade margins scabrous. Leaf-blade apex attenuate.

INFLORESCENCE Inflorescence a panicle.

Panicle open, or contracted; lanceolate, or elliptic; dense; 10–30 cm long; 3–10 cm wide. Primary panicle branches 2 -nate; profusely divided; 5–8 cm long.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 1–2 mm long.

FERTILE SPIKELETS Spikelets comprising 3–5 fertile florets; with a barren rhachilla extension. Spikelets lanceolate, or elliptic; laterally compressed; 6–10 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus evident; 0.5–0.7 mm long; pilose; hairy on the surface; obtuse.

GLUMES Glumes persistent; similar; shorter than spikelet; similar to fertile lemma in texture. Lower glume lanceolate; 4–7 mm long; 1 length of upper glume; membranous; 1-keeled; 3 -veined. Lower glume surface glabrous. Lower glume apex acuminate. Upper glume lanceolate; 4–9 mm long; 1 length of adjacent fertile lemma; membranous; 1-keeled; 3–5 -veined. Upper glume surface glabrous. Upper glume apex acuminate.

FLORETS Fertile lemma lanceolate; 4–6 mm long; membranous; without keel; 5–7 -veined. Lemma surface villous; hairy below. Lemma hairs 3 mm long. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn from a sinus; 2–4.5 mm long overall. Palea 3–4 mm long; 0.6–0.8 length of lemma; 2 -veined.

FLOWER Lodicules 2. Anthers 3; 1.2–1.7 mm long. Ovary glabrous.

FRUIT Caryopsis with adherent pericarp; 2 mm long.

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

NOTES Arundineae. Koyama.

ADDITIONAL CHARACTERS Callus hairs oblique.

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