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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 simonii

HABIT Perennial. Rhizomes elongated; leptomorph. Culms erect, or arching; 600–800 cm long; 20 mm diam.; woody. Culm-internodes terete; hollow; 40–45 cm long; distally glabrous. Lateral branches dendroid. Branch complement three, or several; with subequal branches; thinner than stem. Culm-sheaths persistent; glabrous; hairy on margins; without auricles; glabrous on shoulders. Culm-sheath ligule 3–4 mm high. Culm-sheath blade linear, or lanceolate; reflexed; glabrous on surface. Leaf-sheaths 25 cm long; striately veined; glabrous on surface. Leaf-sheath oral hairs scanty; pale. Ligule an eciliate membrane, or a ciliolate membrane; 3–4 mm long; truncate, or obtuse. Leaf-blade base cuneate; with a brief petiole-like connection to sheath; petiole glabrous. Leaf-blades deciduous at the ligule; lanceolate; 5–30 cm long; 15–35 mm wide; mid-green and glaucous; with undersurface a different shade on either side of midrib. Leaf-blade venation with 8–12 secondary veins; with distinct cross veins.

INFLORESCENCE Inflorescence comprising only a few spikelets; comprising 1 fertile spikelets; subtended by a spatheole; embraced at base by subtending leaf.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 5–8 fertile florets; with diminished florets at the apex. Spikelets linear; laterally compressed; 40–70 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes eventually visible between lemmas; pilose; hairy at tip.

GLUMES Glumes two; persistent; similar; shorter than spikelet. Lower glume ovate; chartaceous; without keels. Lower glume apex acute. Upper glume ovate; chartaceous; without keels. Upper glume apex acute.

FLORETS Fertile lemma ovate; 9 mm long; chartaceous; without keel. Lemma apex acuminate. Palea 1 length of lemma; 2 -veined. Palea keels ciliolate. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 3. Anthers 3. Stigmas 3.

FRUIT Caryopsis with adherent pericarp; apex unappendaged.

DISTRIBUTION Europe: northern. Asia-temperate: Caucasus and eastern Asia. Asia-tropical: India.

NOTES Arundinarieae. Fl Cat 1997.

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