GrassBase - The Online World Grass Flora


W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Avena longiglumis

HABIT Annual. Culms erect; 30–120 cm long. Lateral branches lacking. Ligule an eciliate membrane; obtuse. Leaf-blades 15–25 cm long; 5–10 mm wide.

INFLORESCENCE Inflorescence a panicle.

Panicle open; linear; equilateral, or nodding; 10–15 cm long.

Spikelets pendulous; solitary. Fertile spikelets pedicelled. Pedicels filiform.

FERTILE SPIKELETS Spikelets comprising 2–3 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 25–40 mm long; breaking up at maturity; disarticulating above glumes but not between florets. Floret callus elongated; 5 mm long; bearded; acute; disarticulating obliquely; with linear scar.

GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma; gaping. Lower glume lanceolate; 25–40 mm long; 1 length of upper glume; membranous; without keels; 9–11 -veined. Lower glume apex acuminate. Upper glume elliptic; 25–40 mm long; 1.3 length of adjacent fertile lemma; membranous; without keels; 9–11 -veined. Upper glume apex acuminate.

FLORETS Fertile lemma lanceolate; 20–35 mm long; coriaceous; much thinner above; without keel; 7 -veined. Lemma surface pilose. Lemma apex dentate; 2 -fid; awned; 3 -awned. Principal lemma awn dorsal; arising 0.5 way up back of lemma; geniculate; 40–60 mm long overall; with twisted column. Lateral lemma awns arising on apex of lobes; 10–15 mm long; shorter than principal. Palea keels ciliolate. Palea surface smooth, or scaberulous.

FLOWER Anthers 3. Ovary pubescent all over.

FRUIT Caryopsis with adherent pericarp; sulcate on hilar side; hairy all over. Hilum linear.

DISTRIBUTION Europe: southwestern. Africa: north. Asia-temperate: western Asia.

NOTES Aveneae. Baum 1993.

Please cite this publication as detailed in How to Cite Version: 3rd February 2016.