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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 glabrescens

HABIT Perennial; culms solitary. Rhizomes elongated; leptomorph. Culms erect; 100–200 cm long; 5–10 mm diam.; woody; without nodal roots. Culm-internodes channelled; hollow; 30 cm long; distally glabrous. Lateral branches dendroid. Branch complement three; in a horizontal line; with subequal branches; thinner than stem. Culm-sheaths pubescent; hairy at the base; glabrous on margins; without auricles; ciliate on shoulders. Culm-sheath ligule 1 mm high; ciliolate. Culm-sheath blade linear; reflexed; glabrous on surface. Leaves cauline; 4–5 per branch. Leaf-sheaths striately veined; glabrous on surface; outer margin hairy. Leaf-sheath oral hairs scanty. Leaf-sheath auricles erect. Ligule an eciliate membrane; 1 mm long; pubescent on abaxial surface. Leaf-blade base with a brief petiole-like connection to sheath. Leaf-blades lanceolate; 9–11 cm long; 11–15 mm wide. Leaf-blade venation with 8 secondary veins; with distinct cross veins. Leaf-blade surface pubescent; hairy abaxially. Leaf-blade margins scabrous. Leaf-blade apex acuminate.

INFLORESCENCE Synflorescence bractiferous; fasciculate; lax; with glumaceous subtending bracts; with axillary buds at base of spikelet; prophyllate below lateral spikelets.

Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 5–11 fertile florets; with diminished florets at the apex. Spikelets linear; laterally compressed; 40–70 mm long; 5 mm wide; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes several; 3 empty glumes; persistent; similar; shorter than spikelet.

FLORETS Fertile lemma ovate; 11–14 mm long; chartaceous; without keel. Lemma lateral veins with cross-veins. Lemma margins ciliate; hairy above. Lemma apex acute. Palea 10–12 mm long; chartaceous; 2 -veined. Palea keels ciliate. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 3; veined. Anthers 3. Stigmas 3. Ovary glabrous.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Asia-temperate: China.

NOTES Arundinarieae. Wen 1996.

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