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Descriptions

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

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

Pleioblastus gramineus

HABIT Perennial; caespitose. Rhizomes elongated; leptomorph. Culms erect; 300–500 cm long; 5–20 mm diam.; woody. Culm-internodes terete; hollow; 10–25 cm long; distally glabrous. Culm-nodes glabrous. Lateral branches dendroid. Branch complement two, or three. Culm-sheaths deciduous; coriaceous; glabrous; without auricles. Culm-sheath blade linear. Leaves 5–11 per branch. Leaf-sheaths 2.5–4 cm long; glabrous on surface. Leaf-sheath oral hairs scanty, or setose; 4–6 mm long; pale. Ligule an eciliate membrane, or a ciliolate membrane. Leaf-blade base with a brief petiole-like connection to sheath; petiole 0.1–0.2 cm long. Leaf-blades deciduous at the ligule; linear, or lanceolate; 10–30 cm long; 5–17 mm wide. Leaf-blade venation with distinct cross veins. Leaf-blade surface glabrous. Leaf-blade margins scabrous. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence comprising only a few spikelets.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 5–8 fertile florets; with diminished florets at the apex. Spikelets linear; laterally compressed; 25–45 mm long; 5–8 mm wide; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 4–5 mm long; pubescent.

GLUMES Glumes two; persistent; similar; shorter than spikelet. Lower glume lanceolate; 16–20 mm long; chartaceous; without keels; 7 -veined. Lower glume apex acute. Upper glume lanceolate; chartaceous; without keels; 11 -veined. Upper glume apex acute.

FLORETS Fertile lemma ovate; 13–15 mm long; chartaceous; without keel; 11–13 -veined. Lemma apex acuminate. Palea 10–12 mm long; 8 -veined. Palea keels ciliate. Palea apex with excurrent keel veins. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 3; ovate; veined; ciliate. Anthers 3; 7 mm long. Stigmas 3.

FRUIT Caryopsis with adherent pericarp; fusiform; 7–8 mm long; dark brown; apex unappendaged.

DISTRIBUTION Asia-temperate: eastern Asia. Australasia: New Zealand.

NOTES Arundinarieae. Lin. 2001.

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