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.

Anthoxanthum

HABIT Annual (4), or perennial (13). Rhizomes absent (10), or short (1), or elongated (6). Culms erect (7/10), or geniculately ascending (5/10), or decumbent (2/10), or rambling (2/10); slender (2/5), or weak (3/5); 7–43.41–120 cm long. Lateral branches lacking (12/13), or sparse (3/13). Ligule an eciliate membrane. Leaf-blades filiform (1), or linear (15), or lanceolate (2); stiff (2), or firm (12), or flaccid (3); without scent (4), or aromatic (13). Leaf-blade apex muticous (16), or pungent (1).

INFLORESCENCE Inflorescence a panicle, or composed of racemes (1).

Panicle open (3), or contracted (7), or spiciform (9).

Racemes single (1/1); lanceolate (1/1); paucilateral (1/1).

Spikelets solitary. Fertile spikelets pedicelled. Pedicels oblong (9/9).

FERTILE SPIKELETS Spikelets comprising 2 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate (7), or elliptic (2), or oblong (9), or obovate (1); laterally compressed; 2.49–6.801–13 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes brief up to lowest fertile floret (15), or elongated below proximal fertile floret (2).

GLUMES Glumes persistent; reaching apex of florets (1), or exceeding apex of florets (16); thinner than fertile lemma. Lower glume lanceolate (3), or elliptic (1), or ovate (14); 0.5–0.6418–0.9 length of upper glume; hyaline (1), or membranous (15), or chartaceous (1); 1-keeled; 1 -veined (14), or 3 -veined (3), or 4–5 -veined (1). Lower glume lateral veins absent (14), or distinct (3). Lower glume surface without pits; glabrous (15), or pubescent (2). Lower glume apex obtuse (1), or acute (7), or acuminate (10); muticous (16), or mucronate (2). Upper glume lanceolate (7), or elliptic (5), or oblong (2), or ovate (4), or obovate (1); 1.5–2.626–5 length of adjacent fertile lemma; membranous (16), or chartaceous (1); with undifferentiated margins (13), or hyaline margins (3), or scarious margins (1); 1-keeled; 3 -veined. Upper glume primary vein eciliate, or ciliolate (1). Upper glume surface glabrous (15), or pubescent (2). Upper glume apex acute (10), or acuminate (8); muticous (15), or mucronate (3).

FLORETS Basal sterile florets male (5), or barren (15); with palea (5), or without significant palea (15). Lemma of lower sterile floret linear (1), or oblong (16); 1.3–1.85–2.8 length of fertile lemma; membranous (5), or chartaceous (10), or scarious (2); 3 -veined (1/14), or 4 -veined (2/14), or 5 -veined (13/14); emarginate (3/15), or truncate (1/15), or obtuse (11/15); muticous (1), or awned (16). Fertile lemma elliptic (1), or oblong (6), or ovate (3), or orbicular (10); cartilaginous; without keel; wingless; 3–4 -veined (1), or 5 -veined, or 6–7 -veined (1). Lemma lateral veins obscure. Lemma surface unwrinkled; without grooves. Lemma margins convolute; covering most of palea. Lemma apex emarginate (4), or obtuse (13); muticous, or mucronate (1), or awned (1); 1 -awned (1/1). Palea 1 length of lemma; 1 -veined (16), or 2 -veined (1); without keels (16), or 2-keeled (1).

FLOWER Lodicules absent. Anthers 2 (16), or 3 (2). Stigmas 2; pubescent.

FRUIT Caryopsis with adherent pericarp; lanceolate (1/7), or ellipsoid (6/7), or oblong (1/7). Embryo 0.25–0.31–0.33 length of caryopsis. Hilum punctiform.

DISTRIBUTION Europe (5), or Africa (9), or Temperate Asia (9), or Tropical Asia (5), or Australasia (2), or Pacific (1), or North America (2), or South America (1), or Antarctica (1).

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