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.

Chimonocalamus

HABIT Perennial. Rhizomes short; pachymorph. Culms erect (15/15); 150–497.6–1000 cm long; woody; with root thorns from the nodes (14/14). Culm-internodes terete (15), or quadrangular (1). Culm-nodes swollen (3/3). Lateral branches dendroid. Branch complement three (5/9), or several (5/9), or many (1/9); in a horizontal line (1/6), or in an irregular line (5/6); with subequal branches (3/4), or 3 branches dominant (1/4). Culm-sheaths tardily deciduous (1/9), or deciduous (8/9); without auricles (10/12), or auriculate (2/12). Culm-sheath blade linear (4/14), or lanceolate (6/14), or triangular (6/14). Leaf-sheath auricles absent (15), or falcate (1). Ligule an eciliate membrane (14), or a ciliolate membrane (1), or a ciliate membrane (1). Leaf-blade base with a brief petiole-like connection to sheath. Leaf-blades persistent (10), or deciduous at the ligule (6); linear (8), or lanceolate (13), or elliptic (1), or oblong (1); herbaceous (15), or chartaceous (1). Leaf-blade venation without cross veins (7), or with distinct cross veins (9).

INFLORESCENCE Inflorescence a panicle (7/7).

Panicle open (7/7).

Spikelets solitary (7/7). Fertile spikelets pedicelled (7/7).

FERTILE SPIKELETS Spikelets comprising 2 fertile florets (1/7), or 3 fertile florets (3/7), or 4 fertile florets (2/7), or 5–7 fertile florets (5/7), or 8 fertile florets (3/7), or 9–10 fertile florets (1/7); with diminished florets at the apex (7/7). Spikelets linear (6/7), or lanceolate (1/7), or oblong (1/7); laterally compressed (7/7); 8–35.42–80 mm long; breaking up at maturity (7/7); disarticulating below each fertile floret (7/7). Rhachilla internodes definite (7/7); pubescent (2/7), or pilose (5/7).

GLUMES Glumes persistent (7/7); shorter than spikelet (7/7). Lower glume lanceolate (4/4), or ovate (3/4); chartaceous (4/4); without keels (1/3), or 1-keeled (2/3); 3 -veined (1/2), or 5–9 -veined (1/2). Lower glume surface smooth (6/7), or scabrous (1/7); without pits (7/7); glabrous (6/7), or puberulous (1/7). Lower glume apex acute (4/4); muticous (3/4), or mucronate (1/4). Upper glume lanceolate (4/4), or ovate (4/4); chartaceous (4/4); without keels (4/4); 5 -veined (2/3), or 6–7 -veined (1/3), or 9 -veined (1/3). Upper glume surface smooth (5/7), or asperulous (1/7), or scabrous (1/7); glabrous (6/7), or puberulous (1/7). Upper glume apex acute (2/4), or acuminate (2/4); muticous (2/4), or mucronate (2/4).

FLORETS Fertile lemma lanceolate (6/7), or ovate (2/7); chartaceous (7/7); without keel (7/7); wingless (7/7); 5–6 -veined (1/4), or 7 -veined (2/4), or 9 -veined (2/4). Lemma surface unwrinkled (7/7); without grooves (7/7); glabrous (4/7), or pubescent (3/7). Lemma margins eciliate (6/7), or ciliate (1/7). Lemma apex acute (1/3), or acuminate (1/3), or setaceously attenuate (1/3). Palea 1–1.041–1.1 length of lemma. Palea keels eciliate (5/7), or ciliolate (1/7), or ciliate (1/7). Palea apex dentate (2/2); muticous (6/7), or with excurrent keel veins (1/7). Apical sterile florets resembling fertile though underdeveloped (7/7).

FLOWER Lodicules 3 (7/7); membranous (6/6); glabrous (3/7), or ciliate (4/7). Anthers 3 (7/7). Stigmas 2 (3/7), or 3 (4/7). Ovary glabrous (3/3).

FRUIT Caryopsis with adherent pericarp (7/7); apex unappendaged (1/1).

DISTRIBUTION Temperate Asia (11), or Tropical Asia (6).

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