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.

Ampelocalamus

HABIT Perennial. Rhizomes short (5), or elongated (8); leptomorph (8), or pachymorph (5). Culms erect (8/12), or leaning (1/12), or scandent (3/12); 100–456.1–1000 cm long; woody. Culm-internodes terete. Culm-nodes flush with internodes (1/6), or swollen (5/6). Lateral branches fastigiate (1), or suffrutescent (1), or dendroid (11). Branch complement several (9/10), or many (2/10); in an irregular line (2/3), or in a clump (1/3); with subequal branches (1/4), or 1 branch dominant (4/4), or 2 branches dominant (1/4). Culm-sheaths persistent (4/10), or tardily deciduous (4/10), or deciduous (3/10); without auricles (7/8), or auriculate (1/8). Culm-sheath blade linear (6/11), or lanceolate (8/11); narrower than sheath (1/1). Leaf-sheath auricles absent (8), or erect (1), or falcate (4). Ligule an eciliate membrane (3), or a ciliolate membrane (10), or a ciliate membrane (1). Leaf-blade base without a false petiole (1), or with a brief petiole-like connection to sheath (12). Leaf-blades persistent (3), or deciduous at the ligule (10); linear (2), or lanceolate (11), or oblong (2); herbaceous (6), or chartaceous (6), or coriaceous (1). Leaf-blade midrib conspicuous (1/1). Leaf-blade venation without cross veins (11), or with obscure cross veins (2). Leaf-blade apex muticous (12), or pungent (1).

INFLORESCENCE Synflorescence simple (4/5), or bractiferous (1/5); clustered at the nodes (1/1); in globose clusters (1/1); with glumaceous subtending bracts (1/1); with axillary buds at base of spikelet (1/1); leafless between clusters (1/1). Inflorescence a panicle (1/4), or composed of racemes (1/4), or comprising only a few spikelets (2/4); terminal (2/4), or terminal and axillary (2/4); subtended by an unspecialized leaf-sheath (2/4), or bracts (2/4). Spatheole cymbiform or tubular (1/2), or glumaceous (1/2).

Panicle open (1/1).

Racemes single (1/1); bearing 3–4 fertile spikelets on each (1/1).

Spikelets solitary (4/4). Fertile spikelets sessile (2/5), or pedicelled (3/5).

FERTILE SPIKELETS Spikelets comprising 1 fertile florets (1/5), or 2 fertile florets (2/5), or 3 fertile florets (4/5), or 4 fertile florets (3/5), or 5 fertile florets (4/5), or 6 fertile florets (2/5), or 7 fertile florets (1/5); with a barren rhachilla extension (1/5), or with diminished florets at the apex (4/5). Spikelets linear (1/5), or lanceolate (2/5), or oblong (1/5), or ovate (1/5); laterally compressed (5/5); 8.3–23.63–60 mm long; breaking up at maturity (5/5); disarticulating below each fertile floret (5/5). Rhachilla internodes suppressed between florets (1/5), or definite (4/5).

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

FLORETS Fertile lemma lanceolate (3/5), or ovate (1/5), or orbicular (1/5); chartaceous (4/5), or herbaceous (1/5); without keel (3/4), or keeled (1/4); wingless (5/5); 7 -veined (4/5), or 8 -veined (2/5), or 9 -veined (3/5), or 10–11 -veined (2/5). Lemma midvein without distinctive roughness (4/5), or scaberulous (1/5). Lemma surface unwrinkled (5/5); without grooves (5/5); glabrous (4/5), or pubescent (1/5). Lemma margins eciliate (4/5), or ciliate (1/5). Lemma apex acute (3/5), or acuminate (2/5). Palea membranous (4/5), or chartaceous (1/5); 4 -veined (1/3), or 10–11 -veined (1/3); 2-keeled but the uppermost without keels (1/5), or 2-keeled (4/5). Palea keels eciliate (4/5), or ciliate (1/5). Palea surface glabrous (4/5), or pubescent (1/5). Palea apex dentate (1/1). Apical sterile florets resembling fertile though underdeveloped (4/4).

FLOWER Lodicules absent (1/5), or 1 (1/5), or 2 (1/5), or 3 (4/5); membranous (1/1); glabrous (3/5), or ciliate (2/5). Anthers 3 (4/5), or 6 (1/5). Stigmas 1 (1/5), or 2–3 (2/5). Ovary unappendaged (4/5), or umbonate (1/5); glabrous (1/2), or pubescent on apex (1/2).

FRUIT Caryopsis with adherent pericarp (5/5); apex unappendaged (2/2).

DISTRIBUTION Temperate Asia, or Tropical Asia (1).

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