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.

Semiarundinaria

HABIT Perennial. Rhizomes elongated; leptomorph. Culms erect; 152–609.3–1000 cm long; woody. Culm-internodes terete (5), or channelled (2). Lateral branches dendroid. Branch complement three (6/6), or several (4/6); in a horizontal line (6/6); with subequal branches (2/2), or 3 branches dominant (1/2); thinner than stem (1/1). Culm-sheaths deciduous (3/3); without auricles (5/6), or auriculate (1/6). Culm-sheath blade linear (4/5), or lanceolate (2/5). Leaf-sheath auricles absent (6), or falcate (1). Ligule an eciliate membrane (1), or a ciliolate membrane (6). Leaf-blade base with a brief petiole-like connection to sheath. Leaf-blades lanceolate, or elliptic (3). Leaf-blade venation without cross veins (3), or with distinct cross veins (4).

INFLORESCENCE Synflorescence bractiferous (6/6); fasciculate (6/6); with spathaceous subtending bracts (6/6); without axillary buds at base of spikelet (6/6).

Fertile spikelets sessile (6/6).

FERTILE SPIKELETS Spikelets comprising 2 fertile florets (1/6), or 3–5 fertile florets (3/6), or 6 fertile florets (2/6); with diminished florets at the apex (6/6). Spikelets linear (3/6), or lanceolate (3/6); laterally compressed (6/6); 30–51.5–100 mm long; breaking up at maturity (6/6); disarticulating below each fertile floret (6/6). Rhachilla internodes definite (6/6); glabrous (3/6), or sparsely hairy (2/6), or pubescent (1/6).

GLUMES Glumes one the lower absent or obscure (3/6), or two (4/6); persistent (6/6); shorter than spikelet (6/6). Lower glume elliptic (2/3), or ovate (1/3); 0.8–0.925–1 length of upper glume; chartaceous (3/3); without keels (3/3); 7 -veined (1/1). Lower glume surface without pits (4/4). Lower glume apex acute (3/3). Upper glume lanceolate (1/5), or elliptic (2/5), or ovate (2/5); 0.7–0.75–0.8 length of adjacent fertile lemma; chartaceous (5/5); without keels (5/5); 7 -veined (1/1). Upper glume apex acute (5/5).

FLORETS Fertile lemma elliptic (2/6), or oblong (2/6), or ovate (2/6); chartaceous (6/6); without keel (6/6); wingless (6/6); 7–8 -veined (1/6), or 9 -veined (3/6), or 10 -veined (1/6), or 11 -veined (2/6), or 12 -veined (1/6), or 13 -veined (3/6). Lemma surface smooth (4/6), or scabrous (2/6); unwrinkled (6/6); without grooves (6/6); glabrous (5/6), or puberulous (1/6). Lemma apex acute (1/6), or acuminate (4/6), or cuspidate (1/6). Palea 1 length of lemma; membranous (3/6), or coriaceous (3/6); 6–7 -veined (1/4), or 11–13 -veined (2/4). Palea keels eciliate (1/6), or ciliolate (4/6), or ciliate (1/6). Palea surface glabrous (5/6), or pubescent (1/6). Palea apex dentate (1/1); muticous (3/6), or with excurrent keel veins (3/6). Apical sterile florets resembling fertile though underdeveloped (6/6).

FLOWER Lodicules 3 (6/6); ciliate (6/6). Anthers 3 (6/6). Stigmas 2 (1/6), or 3 (5/6). Ovary unappendaged (5/6), or umbonate (1/6); glabrous (3/3).

FRUIT Caryopsis with adherent pericarp (6/6).

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

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