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.

Gouinia

HABIT Perennial. Rhizomes absent (8), or short (2). Culms erect (7/8), or decumbent (1/8), or scandent (1/8); slender (1/1); 30–109.2–300 cm long. Lateral branches lacking (4/5), or ample (1/5). Ligule an eciliate membrane (6), or a ciliolate membrane (4), or a fringe of hairs (1). Leaf-blades linear, or lanceolate (1).

INFLORESCENCE Inflorescence composed of racemes.

Racemes borne along a central axis; ascending (5), or spreading (4), or drooping (2), or deflexed (2); unilateral. Rhachis angular. Spikelet packing contiguous (2), or lax (6), or distant (2). Raceme-bases brief (5), or filiform (5).

Spikelets appressed (4/7), or ascending (1/7), or spreading (2/7), or deflexed (1/7); solitary. Fertile spikelets sessile (1), or pedicelled (9). Pedicels filiform (1/6), or linear (5/6).

FERTILE SPIKELETS Spikelets comprising 2 fertile florets (3), or 3–4 fertile florets (6), or 5 fertile florets (5), or 6 fertile florets (1); with diminished florets at the apex. Spikelets oblong; laterally compressed; 5–10.43–18 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes definite. Floret callus brief (5), or evident (5); pubescent (4/5), or bearded (1/5).

GLUMES Glumes persistent; shorter than spikelet. Lower glume lanceolate; 0.66–0.797–1 length of upper glume; membranous; 1-keeled; 1 -veined (8), or 2 -veined (4), or 3 -veined (6), or 4 -veined (3), or 5 -veined (2). Lower glume lateral veins absent (2), or distinct (9). Lower glume surface without pits. Lower glume apex obtuse (1), or acute (6), or acuminate (3); muticous (8), or mucronate (2), or awned (1). Upper glume lanceolate (1), or elliptic (3), or ovate (6); 0.6–0.775–1.2 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined (3), or 3–4 -veined (4), or 5 -veined (7), or 6–7 -veined (4). Upper glume apex emarginate (1), or obtuse (4), or acute (4), or acuminate (3); muticous (7), or mucronate (3), or awned (1); 1 -awned (1/1).

FLORETS Fertile lemma lanceolate; membranous; keeled; wingless; 3 -veined, or 4–5 -veined (2), or 6–7 -veined (1). Lemma midvein eciliate (1), or ciliate (9). Lemma lateral veins excurrent (1/1), or extending close to apex (1/1). Lemma surface unwrinkled; without grooves; glabrous (9), or pilose (1); hairy between veins (1/1). Lemma margins eciliate (3), or ciliate (7). Lemma apex entire (4), or dentate (6); 2 -fid (6/6); acuminate (4/4); awned; 1 -awned. Principal lemma awn apical (4), or from a sinus (6); straight, or curved (1). Palea 0.75–0.9375–1 length of lemma; 2 -veined (1/1). Palea keels smooth (9), or scabrous (1); eciliate (5), or ciliate (5). Palea surface glabrous (8), or pubescent (1), or pilose (1). Palea apex muticous (8), or awned (2). Apical sterile florets 1 in number; barren; lanceolate. Apical sterile lemmas muticous (1), or awned (9).

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

FRUIT Caryopsis with adherent pericarp (1/1); ellipsoid (1/1).

DISTRIBUTION North America (5), or South America (7).

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