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.

Apocopis

HABIT Annual (11), or perennial (5). Rhizomes absent (15), or short (1). Culms erect (3/7), or geniculately ascending (2/7), or decumbent (2/7), or rambling (1/7); slender (2/2); 5–32.09–90 cm long; firm (14), or wiry (2). Culm-nodes constricted (1/1). Lateral branches ample (3/3). Ligule an eciliate membrane (14), or a ciliolate membrane (2). Leaf-blades linear, or lanceolate (7); firm (13), or flaccid (3). Leaf-blade midrib conspicuous (2/2). Leaf-blade margins cartilaginous (1/1).

INFLORESCENCE Inflorescence composed of racemes; subtended by an unspecialized leaf-sheath (13), or an inflated leaf-sheath (2), or a spatheole (1); exserted (15), or enclosed (1).

Racemes single (1), or paired (15), or digitate (3); erect (5), or ascending (13). Rhachis fragile at the nodes; subterete (14/14). Rhachis internodes linear (14), or clavate (1), or cuneate (1).

Spikelets appressed (15/15); in pairs. Fertile spikelets sessile; 1 in the cluster. Companion sterile spikelets pedicelled; 1 in the cluster. Pedicels adnate at the base to lower glume of sessile spikelet; linear.

STERILE SPIKELETS Basal sterile spikelets absent (11), or well-developed (5).

Companion sterile spikelets represented by barren pedicels (14), or rudimentary (1), or well-developed (2). Companion sterile spikelet glumes muticous (1/1).

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong (14), or obovate (4), or cuneate (1); dorsally compressed; 3–5.209–9.6 mm long; falling entire; deciduous with accessory branch structures. Spikelet callus bearded (5/5); base obtuse; attached transversely.

GLUMES Glumes reaching apex of florets (13), or exceeding apex of florets (3); firmer than fertile lemma. Lower glume lanceolate (1), or elliptic (1), or oblong (10), or obovate (6), or cuneate (2); membranous (1), or chartaceous (6), or coriaceous (10); without keels; 5 -veined (1/13), or 7 -veined (11/13), or 9–13 -veined (1/13). Lower glume lateral veins obscure (1), or distinct (15); without ribs (15), or ribbed (1). Lower glume surface convex (15), or flat (1); smooth (13), or asperulous (2), or scabrous (1); without pits; glabrous (12), or pilose (6), or hispid (2). Lower glume apex entire (8), or erose (7), or dentate (1); 3–5 -fid (1/1); emarginate (4), or truncate (13), or obtuse (1); muticous (15), or mucronate (1). Upper glume lanceolate (1/15), or oblong (14/15); membranous (1), or chartaceous (15); with undifferentiated margins (13), or hyaline margins (3); 3 -veined (11/11). Upper glume surface smooth (14), or scabrous (2); glabrous (12), or pubescent (1), or pilose (3). Upper glume apex entire (14), or erose (2); truncate (11/12), or acuminate (1/12).

FLORETS Basal sterile florets male, or barren (3); with palea. Lemma of lower sterile floret lanceolate (7), or elliptic (2), or oblong (9), or ovate (1); hyaline; 0 -veined (10/12), or 1 -veined (2/12); truncate (3/5), or obtuse (2/5). Fertile florets bisexual, or female (1). Fertile lemma linear (3), or lanceolate (5), or oblong (11); hyaline (10), or membranous (1), or chartaceous (5); of similar consistency on margins (15), or much thinner on margins (1); without keel; wingless; 0 -veined (1/13), or 1 -veined (13/13). Lemma surface smooth (14), or scabrous (2); unwrinkled; without grooves; glabrous (15), or pilose (1). Lemma margins eciliate (15), or ciliate (1). Lemma apex entire (4), or erose (1), or dentate (12), or lobed (2); 2 -fid (14/14); muticous (2), or mucronate (1), or awned (15); 1 -awned (15/15). Principal lemma awn apical (5), or from a sinus (14); straight (1), or geniculate (15). Column of lemma awn glabrous (4/15), or hispidulous (8/15), or puberulous (1/15), or pubescent (2/15). Palea not rolled (15), or tightly convolute around flower (1); hyaline (12), or membranous (4); 0 -veined (11/12), or 2 -veined (1/12); without keels (12), or 2-keeled (4).

FLOWER Lodicules absent (13/13). Anthers 2 (13/13). Stigmas 2–3 (1/1).

DISTRIBUTION Temperate Asia (4), or Tropical Asia (15).

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