Axonopus

HABIT Annual (6), or perennial (83). Rhizomes absent (72), or short (13), or elongated (9). Stolons absent (72), or present (19). Culms erect (36/45), or geniculately ascending (14/45), or decumbent (5/45); robust (14/27), or slender (12/27), or weak (1/27); 6–70.81–260 cm long; firm (85), or wiry (2); without nodal roots (1/1), or rooting from lower nodes (1/1). Culm-internodes terete (7/28), or elliptical in section (23/28). Culm-nodes flush with internodes (1/3), or swollen (2/3). Lateral branches lacking (18/29), or sparse (7/29), or ample (7/29). Leaves differentiated into sheath and blade (70), or without demarcation between sheath and blade (17). Leaf-sheath auricles absent (86), or erect (3). Ligule an eciliate membrane (1), or a ciliolate membrane (71), or a ciliate membrane (13), or a fringe of hairs (2). Leaf-blades persistent (86), or deciduous at the ligule (6); filiform (3), or linear (84), or lanceolate (9); stiff (21), or firm (66). Leaf-blade midrib conspicuous (4/4). Leaf-blade apex muticous (86), or pungent (2).

INFLORESCENCE Inflorescence composed of racemes; terminal (79), or terminal and axillary (11).

Racemes single (1), or paired (24), or digitate (70), or borne along a central axis (11); erect (9), or ascending (74), or spreading (21), or drooping (1), or deflexed (1); unilateral. Rhachis wingless (86), or narrowly winged (1); flattened (2/85), or angular (83/85); terminating in a spikelet (86), or barren extension (1). Spikelet packing adaxial; contiguous (86), or lax (1); 2 -rowed (16/16). Raceme-bases brief (86), or linear (2).

Spikelets sunken (1), or appressed (86); solitary. Fertile spikelets sessile (58), or pedicelled (35). Pedicels oblong (3/28), or reduced to a stump (26/28); tip rectangular (1/2), or cupuliform (1/2).

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate (9), or elliptic (43), or oblong (32), or ovate (41), or obovate (3); dorsally compressed; 1.1–2.485–5.1 mm long; falling entire. Floret callus glabrous (1/1), or pubescent (1/1).

GLUMES Glumes one the lower absent or obscure, or two (1); shorter than spikelet (2), or reaching apex of florets (83), or exceeding apex of florets (3); thinner than fertile lemma; parallel to lemmas (86), or gaping (1). Lower glume lanceolate (1/1); 1–5 -veined (1/1). Lower glume surface without pits (1/1). Upper glume elliptic (17/30), or oblong (1/30), or ovate (12/30); 1–1.1–1.5 length of adjacent fertile lemma; hyaline (5), or membranous (82); without keels (28/28); 0–1 -veined (1/85), or 2 -veined (33/85), or 3 -veined (22/85), or 4 -veined (30/85), or 5 -veined (44/85), or 6 -veined (7/85), or 7 -veined (10/85), or 9 -veined (1/85). Upper glume lateral veins without ribs (84), or ribbed (3). Upper glume surface glabrous (53), or puberulous (24), or pubescent (25), or pilose (5), or villous (1); with simple hairs (53/54), or tubercle-based hairs (1/54); without hair tufts (86), or with an apical beard (5). Upper glume apex entire (86), or dentate (1); 3 -fid (1/1); obtuse (8/11), or acute (3/11).

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret elliptic (17/30), or oblong (1/30), or ovate (12/30); 0.9–1.102–2 length of fertile lemma; hyaline (3/6), or membranous (3/6); 0–1 -veined (1/85), or 2 -veined (34/85), or 3 -veined (22/85), or 4 -veined (31/85), or 5 -veined (45/85), or 6–7 -veined (10/85), or 9 -veined (1/85); without ribs (84), or ribbed (3); obtuse (3/11), or acute (8/11). Fertile lemma linear (2/35), or elliptic (22/35), or oblong (5/35), or ovate (6/35), or obovate (2/35); coriaceous (1), or indurate (86); without keel; wingless; 4 -veined (1/1). Lemma surface smooth (77), or papillose (6), or striate (4); unwrinkled; without grooves; without hair tufts (86), or with conspicuous apical hairs (1). Lemma margins involute. Lemma apex obtuse (37/62), or acute (26/62), or acuminate (2/62); without ornament (46), or scabrous (2), or pubescent (43). Palea involute; coriaceous (1), or indurate (86).

FLOWER Lodicules 2 (8/8); fleshy (3/3). Anthers 3 (21/21).

FRUIT Caryopsis with adherent pericarp (73/73); ellipsoid (3/3), or obovoid (1/3). Embryo 0.5 length of caryopsis. Hilum punctiform (1/1).

DISTRIBUTION Africa (3), or Temperate Asia (2), or Tropical Asia (2), or Australasia (2), or Pacific (3), or North America (13), or South America (82).

Please cite this publication as detailed in How to Cite Version: 16th November 2012.