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 nuda

HABIT Annual. Culms erect; 45–90 cm long. Culm-internodes distally pruinose. Leaves cauline. Ligule an eciliate membrane; 2–4 mm long. Leaf-blades 10–20 cm long; 3–7 mm wide. Leaf-blade surface scaberulous; rough on both sides. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle.

Panicle open; linear, or lanceolate; 15–25 cm long.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels filiform.

FERTILE SPIKELETS Spikelets comprising 2–4 fertile florets; with a barren rhachilla extension. Spikelets cuneate; laterally compressed; 20–25 mm long; persistent on plant. Floret callus glabrous.

GLUMES Glumes similar; shorter than spikelet; thinner than fertile lemma. Lower glume lanceolate; 20–30(–35) mm long; 1 length of upper glume; membranous; without keels; 7–9 -veined. Lower glume apex acuminate. Upper glume lanceolate; 15–20 mm long; 0.8–1 length of adjacent fertile lemma; membranous; without keels; 7–9 -veined. Upper glume apex acuminate.

FLORETS Fertile lemma lanceolate; 15–20 mm long; coriaceous; much thinner above; without keel; 7–9 -veined. Lemma surface glabrous. Lemma apex dentate; 2 -fid; with lobes 1–3(–4) mm long; lobes acuminate; awned; 1 -awned. Principal lemma awn dorsal; curved; 15–20 mm long overall. Palea 0.5 length of lemma.

FLOWER Anthers 3. Ovary pubescent all over.

FRUIT Caryopsis with adherent pericarp; hairy all over. Hilum linear.

DISTRIBUTION Europe: central and eastern. Asia-temperate: Siberia and China. South America: western South America.

NOTES Aveneae. Fl Eur 1996.

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