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.

Paspalidium

HABIT Annual (6), or perennial (31). Rhizomes absent (29), or short (1), or elongated (7). Stolons absent (36), or present (2). Culms erect (23/33), or geniculately ascending (15/33), or decumbent (4/33), or prostrate (4/33); slender (10/11), or weak (1/11); 7–55.29–200 cm long; spongy (5), or compressible (2), or firm (24), or wiry (5), or woody (1); without nodal roots (3/8), or rooting from lower nodes (8/8). Culm-internodes channelled (1/2), or elliptical in section (1/2). Lateral branches lacking (5/18), or sparse (12/18), or ample (7/18). Ligule an eciliate membrane (1), or a ciliolate membrane (1), or a ciliate membrane (7), or a fringe of hairs (28). Leaf-blade base without a false petiole, or with a false petiole (1). Leaf-blades filiform (1), or linear (36), or lanceolate (1); stiff (4), or firm (33).

INFLORESCENCE Inflorescence composed of racemes.

Racemes single (2), or borne along a central axis; appressed (18), or erect (1), or ascending (17), or deflexed (1); unilateral (30), or paucilateral (7); bearing few fertile spikelets (16), or many spikelets (21); bearing 1–7–20 fertile spikelets on each. Central inflorescence axis unspecialized (33), or flattened (4); tip without extension (14), or with blunt extension (6), or filiform (17). Rhachis wingless (27), or narrowly winged (9), or broadly winged (1); angular (29/36), or subterete (7/36); terminating in a sterile spikelet (1), or barren extension; extension inconspicuous (1), or flattened (3), or subulate (10), or bristle-like (23). Spikelet packing abaxial; crowded (7), or contiguous (28), or lax (2), or distant (1); 2 -rowed (24/24).

Spikelets appressed (4/8), or ascending (1/8), or spreading (1/8), or deflexed (2/8); solitary (36), or in pairs (4), or subtended by an involucre (4). Fertile spikelets sessile (14), or pedicelled (25); 1–2 in the cluster (1/1). Involucre composed of bristles (4/4). Involucral bristles persistent (2/2); 1 in principal whorl (1/1). Pedicels linear (1/7), or oblong (2/7), or reduced to a stump (4/7); tip discoid (15/15).

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate (6), or elliptic (22), or oblong (3), or ovate (18), or orbicular (1), or obovate (2); of unremarkable solid shape (36), or globose (1); laterally compressed (6), or dorsally compressed (31); symmetrical (13), or gibbous (9), or turgidly plano-convex (1), or plano-convex (14); 1.245–2.592–4.5 mm long; falling entire. Rhachilla internodes brief up to lowest fertile floret (34), or elongated between glumes (3), or elongated below basal sterile floret (3), or elongated between basal sterile florets (2), or elongated below proximal fertile floret (1).

GLUMES Glumes shorter than spikelet (29), or reaching apex of florets (10); thinner than fertile lemma; parallel to lemmas (36), or gaping (1). Lower glume elliptic (1), or oblong (4), or ovate (21), or orbicular (7), or oblate (7); clasping (14/14); not gibbous (35), or gibbous (2); 0.3–0.4–0.5 length of upper glume; hyaline (2), or membranous (36), or scarious (1); without keels; 0 -veined (6), or 1 -veined (5), or 2 -veined (4), or 3 -veined (26), or 4 -veined (13), or 5 -veined (20), or 6 -veined (3), or 7 -veined (4). Lower glume lateral veins absent (3), or distinct (32), or prominent (2). Lower glume surface smooth (36), or asperulous (1); without pits; glabrous, or puberulous (1). Lower glume apex truncate (9), or obtuse (17), or acute (17), or acuminate (1). Upper glume lanceolate (2), or elliptic (22), or oblong (2), or ovate (8), or orbicular (5), or obovate (1); not gibbous (34), or gibbous (3); 0.9 length of adjacent fertile lemma; hyaline (1), or membranous (32), or cartilaginous (5); without keels; 3–7–15 -veined. Upper glume lateral veins transversely connected at apex (1/4), or with cross-veins (3/4); parallel at apex (1/1). Upper glume apex truncate (2), or obtuse (28), or acute (16), or acuminate (1).

FLORETS Basal sterile florets male (9), or barren (28); with palea (17), or without significant palea (22). Lemma of lower sterile floret lanceolate (2), or elliptic (24), or ovate (12), or orbicular (1), or obovate (1); membranous (32), or cartilaginous (5); 3–4 -veined (1), or 5 -veined (32), or 6 -veined (7), or 7 -veined (9), or 9–10 -veined (1), or 11 -veined (3), or 12–13 -veined (1); without grooves (27), or sulcate (10); obtuse (17), or acute (32), or acuminate (1). Fertile lemma lanceolate (1), or elliptic (29), or ovate (10), or obovate (1); laterally compressed (4/4); not gibbous (32), or gibbous (5); indurate; of similar consistency on margins (36), or much thinner on margins (1); without keel; wingless; 5 -veined (6/6), or 6–7 -veined (1/6). Lemma lateral veins obscure (2/2). Lemma surface smooth (27), or granulose (8), or striate (3); unwrinkled (6), or rugulose (24), or rugose (9); without grooves. Lemma margins involute. Lemma apex obtuse (2/33), or acute (28/33), or acuminate (1/33), or apiculate (5/33); without ornament (36), or pubescent (1); muticous (36), or mucronate (1). Palea embraced by lemma (2), or reflexed at apex (35); 1 length of lemma; indurate.

FLOWER Anthers 3 (9/9).

FRUIT Caryopsis with adherent pericarp (17/17); orbicular (2/2). Embryo 0.2–0.4533–0.66 length of caryopsis. Hilum punctiform (1/1).

DISTRIBUTION Africa (6), or Temperate Asia (5), or Tropical Asia (5), or Australasia (23), or Pacific (4), or North America (4), or South America (7).

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