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.

Acidosasa

HABIT Perennial. Rhizomes absent (1), or short (5), or elongated (5); leptomorph (5/10), or pachymorph (5/10). Culms erect (7/7); 106.4–523–1560 cm long; woody. Culm-internodes terete. Culm-nodes flush with internodes (1/2), or swollen (2/2); with distinct supra-nodal ridge (1/1). Lateral branches dendroid. Branch complement two (1/10), or three (10/10); in a clump (1/1); with subequal branches (2/2), or 1 branch dominant (1/2); thinner than stem (1/1). Culm-sheaths deciduous (7/7); without auricles (5/10), or auriculate (5/10). Culm-sheath blade linear (2/10), or lanceolate (8/10), or ovate (1/10), or triangular (1/10). Leaf-sheath auricles absent (10), or falcate (1). Ligule an eciliate membrane (9), or a ciliolate membrane (2). Leaf-blade base with a brief petiole-like connection to sheath. Leaf-blades lanceolate. Leaf-blade venation without cross veins (4), or with obscure cross veins (1), or with distinct cross veins (6).

INFLORESCENCE Synflorescence simple (9/10), or bractiferous (1/10); scanty (1/1); with glumaceous subtending bracts (1/1); with axillary buds at base of spikelet (1/1). Inflorescence a panicle (2/9), or composed of racemes (6/9), or comprising only a few spikelets (6/9).

Panicle open (1/1).

Racemes single (6/6); bearing few fertile spikelets (6/6); bearing 2 fertile spikelets on each (2/6), or 3 fertile spikelets on each (6/6), or 4 fertile spikelets on each (5/6), or 5 fertile spikelets on each (3/6), or 6 fertile spikelets on each (1/6).

Spikelets ascending (1/1), or pendulous (1/1); solitary (9/9). Fertile spikelets sessile (2/10), or pedicelled (9/10).

FERTILE SPIKELETS Spikelets comprising 3–4 fertile florets (4/9), or 5–7 fertile florets (5/9), or 8–10 fertile florets (6/9), or 11–12 fertile florets (5/9), or 13–15 fertile florets (4/9), or 16–17 fertile florets (3/9), or 18 fertile florets (2/9), or 19–33 fertile florets (1/9); with diminished florets at the apex (10/10). Spikelets linear (8/10), or lanceolate (3/10), or oblong (1/10); laterally compressed (10/10); 15–63.11–170 mm long; breaking up at maturity (10/10); disarticulating below each fertile floret (10/10). Rhachilla internodes definite (10/10); glabrous (5/10), or pubescent (5/10).

GLUMES Glumes two (6/10), or several (4/10); persistent (10/10); shorter than spikelet (10/10). Lower glume ovate (9/9); chartaceous (9/9); without keels (8/9), or 1-keeled (1/9); 3 -veined (1/2), or 7–9 -veined (1/2). Lower glume surface smooth (10/10), or scabrous (1/10); without pits (10/10); glabrous (9/10), or puberulous (2/10). Lower glume apex acute (9/9); muticous (8/9), or mucronate (1/9). Upper glume lanceolate (4/9), or ovate (7/9); chartaceous (9/9); without keels (8/9), or 1-keeled (1/9); 11–13 -veined (1/1). Upper glume surface smooth (10/10), or scabrous (1/10); glabrous (9/10), or puberulous (2/10). Upper glume apex acute (9/9); muticous (3/9), or mucronate (6/9).

FLORETS Fertile lemma oblong (3/10), or ovate (9/10); chartaceous (10/10); without keel (10/10); wingless (10/10); 9–11 -veined (1/6), or 13–14 -veined (2/6), or 15 -veined (4/6), or 16 -veined (3/6), or 17–18 -veined (4/6), or 19 -veined (3/6). Lemma surface unwrinkled (10/10); without grooves (10/10); glabrous (5/10), or puberulous (1/10), or pubescent (3/10), or hispidulous (1/10). Lemma margins eciliate (7/10), or ciliolate (1/10), or ciliate (2/10). Lemma apex obtuse (1/9), or acute (2/9), or acuminate (7/9); muticous (9/10), or mucronate (1/10). Palea 1 length of lemma; 2 -veined (1/2), or 9 -veined (1/2). Palea keels separated (9/10), or approximate (1/10); smooth (9/10), or scaberulous (1/10); eciliate (3/10), or ciliolate (5/10), or ciliate (2/10). Palea surface glabrous (7/10), or puberulous (1/10), or pubescent (2/10). Apical sterile florets resembling fertile though underdeveloped (10/10).

FLOWER Lodicules 3 (10/10); glabrous (6/10), or ciliate (4/10). Anthers 4–5 (1/10), or 6 (10/10). Stigmas 3 (10/10). Ovary glabrous (4/4).

FRUIT Caryopsis with adherent pericarp (10/10); apex unappendaged (9/9).

DISTRIBUTION Temperate Asia (10), or Tropical Asia (1).

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