Poaceae
Avena

Avena clauda Durieu

First published in Rev. Bot. Recueil Mens. 1: 360 (1845)
This species is accepted
The native range of this species is NW. Africa, E. Balkan Peninsula to W. & Central Asia. It is an annual and grows primarily in the temperate biome.

Descriptions

Extinction risk predictions for the world's flowering plants to support their conservation (2024). Bachman, S.P., Brown, M.J.M., Leão, T.C.C., Lughadha, E.N., Walker, B.E. https://nph.onlinelibrary.wiley.com/doi/full/10.1111/nph.19592

Conservation
Predicted extinction risk: not threatened. Confidence: confident
[AERP]

Morphology General Habit
Annual; culms solitary, or caespitose. Culms erect, or geniculately ascending; 13-60 cm long. Culm-internodes glaucous. Lateral branches lacking. Leaf-sheaths glabrous on surface, or pilose. Ligule an eciliate membrane; 1.8-3 mm long; obtuse. Leaf-blades 3-10 cm long; 2-4 mm wide. Leaf-blade surface glabrous, or pilose.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle open; elliptic; nodding; 6-15 cm long; 4-6 cm wide. Spikelets pendulous; solitary. Fertile spikelets pedicelled. Pedicels filiform.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 3-5 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 18-25 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus evident; bearded; obtuse; disarticulating obliquely. Floret callus hairs 4-4.5 mm long.
Fertile
Spikelets comprising 3-5 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 18-25 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus evident; bearded; obtuse; disarticulating obliquely. Floret callus hairs 4-4.5 mm long.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma; gaping. Lower glume lanceolate; 11-15 mm long; 0.5-0.66 length of upper glume; membranous; without keels; 3-5 -veined. Lower glume apex acuminate. Upper glume elliptic; 20-25 mm long; 1-1.3 length of adjacent fertile lemma; membranous; without keels; 7 -veined. Upper glume apex acuminate.
Morphology Reproductive morphology Flowers Florets
Fertile lemma lanceolate; 20 mm long; coriaceous; much thinner above; without keel; 7 -veined. Lemma surface glabrous, or pilose; hairy above. Lemma apex dentate; 2 -fid; awned; 3 -awned. Principal lemma awn dorsal; arising 0.33-0.5 way up back of lemma; geniculate; 30 mm long overall; with twisted column. Lateral lemma awns arising on apex of lobes; 7 mm long; shorter than principal. Palea keels ciliolate.
Morphology Reproductive morphology Flowers
Anthers 3. Ovary pubescent all over.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; sulcate on hilar side; hairy all over. Hilum linear.
Distribution
Europe: southeastern. Africa: north. Asia-temperate: Soviet Middle Asia, Caucasus, and western Asia.
Reference
Aveneae. Fl Turk 1993.
[GB]

Sources

  • Angiosperm Extinction Risk Predictions v1

    • Angiosperm Threat Predictions
    • http://creativecommons.org/licenses/by/4.0

  • GrassBase - The Online World Grass Flora

    • Clayton, W.D., Vorontsova, M.S., Harman, K.T. and Williamson, H. (2006 onwards). GrassBase - The Online World Grass Flora.
    • http://creativecommons.org/licenses/by-nc-sa/3.0

  • Herbarium Catalogue Specimens

    • 'The Herbarium Catalogue, Royal Botanic Gardens, Kew. Published on the Internet http://www.kew.org/herbcat [accessed on Day Month Year]'. Please enter the date on which you consulted the system.
    • Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/3.0/

  • Kew Backbone Distributions

    • The International Plant Names Index and World Checklist of Vascular Plants 2026. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0

  • Kew Names and Taxonomic Backbone

    • The International Plant Names Index and World Checklist of Vascular Plants 2026. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 International Plant Names Index and World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0

  • Kew Science Photographs

    • Copyright applied to individual images