GrassBase - The Online World Grass Flora

Descriptions

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

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

Pleioblastus

HABIT Perennial. Rhizomes elongated; leptomorph. Culms erect (14/14); 20–364.4–800 cm long; woody; without nodal roots (1/1), or with aerial roots from the nodes (1/1). Culm-internodes terete. Culm-nodes swollen (5/5); with distinct supra-nodal ridge (4/4). Lateral branches suffrutescent (1), or dendroid (15). Branch complement one (1/10), or two (1/10), or three (2/10), or several (8/10); with subequal branches (1/2), or 1 branch dominant (1/2). Culm-sheaths persistent (2/7), or tardily deciduous (3/7), or deciduous (2/7); without auricles (8/14), or auriculate (7/14). Culm-sheath blade linear (4/13), or lanceolate (9/13), or ovate (1/13), or triangular (3/13); narrower than sheath (1/1). Leaf-sheath auricles absent (11), or erect (3), or falcate (5). Ligule an eciliate membrane (15), or a ciliolate membrane (3). Leaf-blade base with a brief petiole-like connection to sheath. Leaf-blades persistent (13), or deciduous at the ligule (3); linear (1), or lanceolate (14), or elliptic (3), or ovate (1). Leaf-blade venation without cross veins (12), or with distinct cross veins (4).

INFLORESCENCE Synflorescence simple (3/5), or compound (2/5); fasciculate (1/1). Inflorescence a panicle (1/5), or composed of racemes (1/5), or comprising only a few spikelets (3/5); terminal (3/5), or terminal and axillary (2/5); subtended by an unspecialized leaf-sheath (4/5), or a spatheole (1/5); exserted (3/5), or embraced at base by subtending leaf (2/5).

Panicle open (1/1).

Racemes single (1/1); bearing 3–10 fertile spikelets on each (1/1).

Spikelets solitary (5/5). Fertile spikelets pedicelled (5/5).

FERTILE SPIKELETS Spikelets comprising 4 fertile florets (2/5), or 5 fertile florets (3/5), or 6 fertile florets (4/5), or 7 fertile florets (3/5), or 8 fertile florets (2/5), or 9–12 fertile florets (1/5); with diminished florets at the apex (5/5). Spikelets linear (5/5); laterally compressed (5/5); 24.9–38.68–60 mm long; breaking up at maturity (5/5); disarticulating below each fertile floret (5/5). Rhachilla internodes definite (5/5); glabrous (4/5), or pubescent (1/5).

GLUMES Glumes two (2/5), or several (3/5); persistent (5/5); shorter than spikelet (5/5). Lower glume lanceolate (4/4); chartaceous (4/4); without keels (4/4). Lower glume surface without pits (5/5). Lower glume apex acute (3/3). Upper glume lanceolate (2/3), or ovate (1/3); chartaceous (3/3); without keels (3/3). Upper glume apex acute (3/3).

FLORETS Fertile lemma lanceolate (2/5), or ovate (4/5); chartaceous (5/5); without keel (5/5); wingless (5/5); 5–6 -veined (1/4), or 7 -veined (2/4), or 8 -veined (1/4), or 9 -veined (3/4), or 10–11 -veined (1/4). Lemma surface unwrinkled (5/5); without grooves (5/5). Lemma margins eciliate (5/5), or ciliolate (1/5). Lemma apex acute (2/5), or acuminate (3/5); muticous (5/5), or mucronate (1/5). Palea 1 length of lemma; 2 -veined (1/1). Palea keels eciliate (4/5), or ciliate (1/5). Palea surface glabrous (3/5), or pubescent (2/5). Apical sterile florets resembling fertile though underdeveloped (5/5).

FLOWER Lodicules 3 (5/5); glabrous (4/5), or ciliate (1/5). Anthers 3 (5/5). Stigmas 3 (5/5). Ovary glabrous (1/1).

FRUIT Caryopsis with adherent pericarp (5/5); apex unappendaged (5/5).

DISTRIBUTION Temperate Asia, or Australasia (1), or Pacific (1).

Please cite this publication as detailed in How to Cite Version: 27th January 2014.