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Descriptions

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

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

Ampelocalamus stoloniformis

HABIT Perennial. Rhizomes elongated; leptomorph. Culms erect; 300–500 cm long; 3–6 mm diam.; woody; 25–55 -noded. Culm-internodes terete; hollow; 13–18 cm long. Culm-nodes swollen. Lateral branches dendroid. Branch complement several; in a clump. Culm-sheaths chartaceous; brown; smooth; glabrous; without auricles. Culm-sheath ligule 0.5 mm high; ciliate. Culm-sheath blade linear, or lanceolate; reflexed; glabrous on surface; acuminate. Leaves 3–10 per branch. Leaf-sheaths 2–6 cm long; glabrous on surface. Leaf-sheath auricles absent. Ligule a ciliate membrane; 3 mm long. Leaf-blade base with a brief petiole-like connection to sheath; petiole 0.1–0.2 cm long. Leaf-blades lanceolate; 2–6 cm long; 3–6 mm wide; chartaceous. Leaf-blade venation with 6–8 secondary veins; with obscure cross veins. Leaf-blade surface glabrous. Leaf-blade margins scaberulous. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence composed of racemes; subtended by bracts.

Racemes 1; paired.

Fertile spikelets pedicelled. Pedicels 15–19 mm long.

FERTILE SPIKELETS Spikelets comprising 3–4 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 12–15 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 1–2 mm long.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 4–6 mm long; 1 length of upper glume; without keels; 3–5 -veined. Upper glume lanceolate; 4–6 mm long; 0.5–0.6 length of adjacent fertile lemma; without keels; 4–5 -veined.

FLORETS Fertile lemma lanceolate; 7–11 mm long; without keel; 7–9 -veined. Lemma surface glabrous. Lemma apex acuminate. Palea 8–9 mm long. Palea apex dentate; 2 -fid. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 3; ciliate. Anthers 3; 4–5 mm long. Stigmas 3.

FRUIT Caryopsis oblong; 10–12 mm long; light brown; acute.

DISTRIBUTION Asia-temperate: China.

NOTES Arundinarieae. Chen & Wang 2008.

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