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.

Enneapogon

HABIT Annual (8), or perennial (23). Rhizomes absent (21), or short (3). Culms erect (3/5), or geniculately ascending (3/5), or decumbent (2/5); slender (1/1); 3–39.85–107 cm long; firm (18), or wiry (6). Culm-internodes channelled (1/1). Lateral branches lacking (6/15), or sparse (9/15), or ample (6/15). Ligule a fringe of hairs. Leaf-blades persistent (23), or deciduous at the ligule (1); filiform (4), or linear (20); stiff (3), or firm (21).

INFLORESCENCE Inflorescence a panicle; terminal, or terminal and axillary (1).

Panicle open (1), or contracted (7), or spiciform (17), or capitate (2).

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets (22), or 2 fertile florets (3), or 3 fertile florets (1); with diminished florets at the apex. Spikelets oblong; laterally compressed; 2–5.41–13.6 mm long; breaking up at maturity; disarticulating below each fertile floret (23), or above glumes but not between florets (1). Rhachilla internodes definite (3/3). Floret callus pubescent (1/2), or pilose (1/2).

GLUMES Glumes persistent; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate (3), or elliptic (2), or ovate (21); 0.6–0.887–1 length of upper glume; membranous; without keels; 3–8–23 -veined. Lower glume lateral veins without ribs (22), or ribbed (2). Lower glume surface smooth (22), or asperulous (2), or scabrous (1); without pits; glabrous (8), or pubescent (14), or pilose (11). Lower glume apex entire (20), or erose (9), or dentate (1); 2 -fid (1/1); emarginate (1), or truncate (7), or obtuse (10), or acute (15), or acuminate (6); muticous (21), or mucronate (9). Upper glume lanceolate (2), or elliptic (3), or oblong (1), or ovate (19); 1.2–2.202–4 length of adjacent fertile lemma; membranous; without keels; 3–7–23 -veined. Upper glume lateral veins without ribs (22), or ribbed (2). Upper glume surface smooth (23), or asperulous (1), or scabrous (1); glabrous (8), or pubescent (14), or pilose (11); with simple hairs (16/20), or tubercle-based hairs (1/20), or capitate hairs (8/20). Upper glume apex entire (20), or erose (9), or dentate (1); 2 -fid (1/1); emarginate (2/23), or truncate (6/23), or obtuse (10/23), or acute (14/23), or acuminate (6/23); muticous (23), or mucronate (7).

FLORETS Fertile lemma oblong (13), or orbicular (7), or oblate (4); membranous (6), or chartaceous (8), or cartilaginous (11), or coriaceous (7); of similar consistency above (21), or firmer above (3); of similar consistency on margins (22), or much thinner on margins (3); without keel; wingless; 9 -veined, or 10–11 -veined (8). Lemma lateral veins obscure (4/4); without ribs (18), or ribbed (11). Lemma surface unwrinkled; without grooves; pubescent (4), or pilose (13), or villous (7); without hair tufts (23), or with a transverse row of hair tufts (1). Lemma margins eciliate (14), or ciliolate (2), or ciliate (13). Lemma apex dentate; 9 -fid; awned; 9 -awned. Principal lemma awn 0.8–1.804–3 length of lemma; limb glabrous (1), or ciliate (11), or plumose (12). Lateral lemma awns subequal to principal. Palea 1–1.125–1.4 length of lemma; membranous (22), or cartilaginous (2). Palea keels smooth (22), or scaberulous (2); eciliate (2), or ciliolate (14), or ciliate (9). Palea surface glabrous (8), or pubescent (15), or pilose (3). Palea apex dentate (1/1); muticous (22), or with excurrent keel veins (1), or awned (4). Apical sterile florets 1 in number (3), or 2 in number (16), or 3 in number (11), or 4 in number (7), or 5 in number (2); barren; separate (15), or in a clump (9); rudimentary (7/8), or oblong (1/8). Apical sterile lemmas awned. Apical sterile lemma awns glabrous (1), or ciliate (23).

FLOWER Lodicules 2. Anthers 3.

FRUIT Caryopsis with adherent pericarp; ellipsoid (15/16), or oblong (3/16), or orbicular (1/16), or obovoid (13/16); plano-convex (7/15), or concavo-convex (9/15). Embryo 0.75–0.8–0.9 length of caryopsis. Hilum punctiform (21/21).

CLEISTOGENES AND VIVIPARY Cleistogenes absent (21), or present (4); in upper sheaths (2/4), or in lower sheaths (3/4).

DISTRIBUTION Europe (1), or Africa (8), or Temperate Asia (6), or Tropical Asia (4), or Australasia (16), or North America (1), or South America (1).

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