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.

Yakirra

HABIT Annual (6), or perennial (3). Culms erect (5/6), or geniculately ascending (1/6), or decumbent (1/6); 5–40.5–100 cm long. Culm-internodes terete (1/1), or elliptical in section (1/1). Lateral branches lacking (1/4), or sparse (1/4), or ample (2/4). Ligule a fringe of hairs. Leaf-blade margins cartilaginous (1/1).

INFLORESCENCE Inflorescence a panicle; terminal (5), or terminal and axillary (2); exserted (4), or embraced at base by subtending leaf (3).

Panicle open (6), or contracted (2).

Spikelets solitary, or in pairs (1). Fertile spikelets pedicelled; 1–2 in the cluster (1/1).

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate (1), or elliptic (6), or oblong (2), or ovate (1), or oblanceolate (2); dorsally compressed; 2.075–4.416–6 mm long; falling entire. Rhachilla internodes brief up to lowest fertile floret (2), or elongated between glumes (5). Floret callus evident; without wings (1), or winged (6); with free apical wings (6/6); truncate.

GLUMES Glumes shorter than spikelet (1), or reaching apex of florets; thinner than fertile lemma. Lower glume elliptic (1), or ovate; membranous; without keels; 3–4 -veined (3), or 5 -veined, or 6–7 -veined (2). Lower glume surface smooth (6), or scabrous (1); without pits. Lower glume apex acute (5), or acuminate (2), or caudate (1). Upper glume lanceolate (2), or elliptic (4), or oblong (1), or ovate (3); membranous (6), or coriaceous (1); without keels; 5–6 -veined (1), or 7 -veined (6), or 9 -veined (1). Upper glume apex acute (5), or acuminate (3), or caudate (1).

FLORETS Basal sterile florets barren; with palea (2), or without significant palea (5). Lemma of lower sterile floret elliptic (4), or oblong (3), or ovate (3), or orbicular (1); membranous (6), or coriaceous (1); 5 -veined (3/6), or 7 -veined (3/6); acute (4), or acuminate (4), or caudate (1). Fertile lemma elliptic (5), or oblong (1), or ovate (4); chartaceous (1), or indurate (6); without keel; wingless; 5 -veined (1/3), or 7 -veined (2/3). Lemma surface unwrinkled; without grooves. Lemma margins involute. Lemma apex obtuse (6), or acute (3). Palea involute; 1 length of lemma; chartaceous (1), or indurate (6).

FLOWER Anthers 3 (4/4).

FRUIT Caryopsis with adherent pericarp (2/2); oblong (1/1). Embryo 0.5 length of caryopsis. Hilum punctiform (1/1).

DISTRIBUTION Tropical Asia (1), or Australasia (6).

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