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Descriptions

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

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

Oligostachyum sulcatum

HABIT Perennial. Rhizomes elongated; leptomorph. Culms erect; 1000–1200 cm long; 40–62 mm diam.; woody. Culm-internodes terete; hollow; 37.5 cm long; distally mealy. Lateral branches dendroid; ascending. Branch complement three. Culm-sheaths coriaceous; green; hispid; hairy on margins; without auricles; glabrous on shoulders. Culm-sheath ligule 3.5 mm high; ciliolate. Culm-sheath blade lanceolate, or narrowly ovate; erect, or spreading. Leaves 3–5 per branch. Leaf-sheaths deciduous; 9–16 cm long; glabrous on surface. Leaf-sheath oral hairs lacking. Ligule a ciliolate membrane; 1–1.5 mm long. Leaf-blade base with a brief petiole-like connection to sheath. Leaf-blades lanceolate. Leaf-blade venation with distinct cross veins.

INFLORESCENCE Inflorescence composed of racemes; bracteate at pedicel base.

Racemes bearing 2–3 fertile spikelets on each.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 10–15 mm long.

FERTILE SPIKELETS Spikelets comprising 3–7 fertile florets; with diminished florets at the apex. Spikelets linear; laterally compressed; 15–37 mm long; 1.5–3 mm wide; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 3–5 mm long; chartaceous; without keels. Lower glume lateral veins obscure. Lower glume surface scabrous. Lower glume apex acute. Upper glume elliptic; 7–10 mm long; chartaceous; without keels; 9 -veined. Upper glume surface scabrous. Upper glume apex acute.

FLORETS Fertile lemma 11–13 mm long; chartaceous; without keel; 9–15 -veined. Lemma lateral veins with cross-veins. Lemma surface scabrous. Lemma apex acuminate; mucronate. Palea 2 -veined. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 3. Anthers 3. Stigmas 3.

FRUIT Caryopsis with adherent pericarp; apex unappendaged.

DISTRIBUTION Asia-temperate: China.

NOTES Arundinarieae. Wang & Ye 1996.

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