Avena sterilis L.

First published in Sp. Pl., ed. 2.: 118 (1762), nom. cons.
This species is accepted
The native range of this species is Canary Islands, Medit. to W. Himalaya and Kenya. It is an annual and grows primarily in the temperate biome.

Descriptions

Gramineae, W. D. Clayton, S. M. Phillips & S. A. Renvoize. Flora of Tropical East Africa. 1974

Morphology General Habit
Annual; culms 30–120 cm. high, ascending from a geniculate or prostrate base, slender to rather stout, simple.
Morphology Leaves
Leaf-blades up to 45 cm. long and 4–18 mm. wide, glabrous, scaberulous above and on the margins; ligules up to 6 mm. long.
Morphology Reproductive morphology Inflorescences
Panicle nodding, up to 30 cm. long and 20 cm. wide, loose, with coarsely scaberulous branches.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets pendulous, 35–50 mm. long, 2–5-flowered, the rhachilla articulated at the base of the lowest floret only; glumes narrowly lanceolate, finely acute; lemmas 25–40 mm. long, densely bearded with hairs up to 7 mm. long around the horseshoe-shaped basal callus, loosely to densely hairy with long stiff hairs in the lower two-thirds, scabrid or shortly pubescent above, narrowed upwards and finely 2-toothed at the apex; awn 4–8 cm. long, geniculate, the column dark brown and pubescent.
Habitat
Weed of arable land; 2600 m.
Distribution
K3 southern Europe, North Africa, western and central Asiaintroduced elsewhere
[FTEA]

IUCN Red List of Threatened Species https://www.iucnredlist.org/species/172204/19395364

Conservation
LC - least concern
[IUCN]

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]

Seed Collecting Guide. RBG Kew (2013-2016)

Morphology General Habit
Annual-Culms 30-180 cm long, geniculately ascending, or decumbent, 2-5-noded
Morphology Leaves
Cauline, blades 10-60 cm long, 4-18 mm wide, surface rough
Morphology Reproductive morphology Inflorescences
Paniculate, nodding, pyramidal, 10-45 cm long, 5-25 cm wide
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets 23-50 mm long, breaking up at maturity, disarticulating above glumes but not between florets
Morphology Reproductive morphology Inflorescences Bracts Glume
Persistent, exceeding apex of florets
Fertile
Fertile lemma lanceolate, 15-40 mm long, coriaceous, much thinner above, apex dentate, bifid, with a dorsal awn, arising 0.5 way up back of lemma, geniculate, 30-80 mm long, with twisted column Fertile spikelets comprising 2-5 fertile florets, with a sterile rhachilla extension
Morphology Reproductive morphology Inflorescences Bracts Lemma
Column of lemma awn hispidulous to pubescent
Morphology Reproductive morphology Inflorescences Bracts Palea
Palea keel ciliate
Morphology Reproductive morphology Flowers
Ovary pubescent all over
Morphology Reproductive morphology Flowers Florets
Floret callus evident, bearded, obtuse, disarticulating obliquely
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp, 11-12 mm long, hairy all over
Morphology Reproductive morphology Seeds Hilum
Hilum linear.
Ecology
Arable land, especially fields of cereals, disturbed open ground, roadsides and field edges. Altitude: 2100 - 2400 m.
Distribution
Distributed globally.
Conservation
Least concerned.
Phenology
Flower (February-May), fruit (February-May).
[SCG]

Morphology General Habit
Annual. Culms geniculately ascending, or decumbent; 30-180 cm long; 2-5 -noded. Leaves cauline. Ligule an eciliate membrane; 3-8 mm long. Leaf-blades 10-60 cm long; 4-18 mm wide. Leaf-blade surface scaberulous; rough adaxially. Leaf-blade margins scaberulous.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle open; pyramidal; effuse; nodding; 10-45 cm long; 5-25 cm wide. Primary panicle branches drooping. Panicle branches scaberulous. Spikelets pendulous; solitary. Fertile spikelets pedicelled. Pedicels filiform; 5-35 mm long.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 2-5 fertile florets; with a barren rhachilla extension. Spikelets cuneate; laterally compressed; 23-50 mm long; breaking up at maturity; disarticulating above glumes but not between florets. Floret callus evident; bearded; obtuse; disarticulating obliquely. Floret callus hairs 0.15 length of lemma.
Fertile
Spikelets comprising 2-5 fertile florets; with a barren rhachilla extension. Spikelets cuneate; laterally compressed; 23-50 mm long; breaking up at maturity; disarticulating above glumes but not between florets. Floret callus evident; bearded; obtuse; disarticulating obliquely. Floret callus hairs 0.15 length of lemma.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma; gaping. Lower glume lanceolate; 23-50 mm long; 1 length of upper glume; membranous; without keels; 7-11 -veined. Lower glume apex acuminate. Upper glume lanceolate; 23-50 mm long; 1.2-1.4 length of adjacent fertile lemma; membranous; without keels; 7-11 -veined. Upper glume apex acuminate.
Morphology Reproductive morphology Flowers Florets
Fertile lemma lanceolate; 15-40 mm long; coriaceous; much thinner above; without keel; 7 -veined. Lemma surface scaberulous; rough above; pilose; hairy below. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.5 way up back of lemma; geniculate; 30-80 mm long overall; with twisted column. Column of lemma awn hispidulous to pubescent. Palea keels ciliate.
Morphology Reproductive morphology Flowers
Anthers 3; 2.5-4 mm long. Ovary pubescent all over.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; 11-12 mm long; hairy all over. Hilum linear.
Distribution
Europe: northern, central, southwestern, southeastern, and eastern. Africa: north, Macaronesia, west tropical, northeast tropical, east tropical, and south. Asia-temperate: Soviet Middle Asia, Caucasus, western Asia, Arabia, and China. Asia-tropical: India. Australasia: Australia and New Zealand. North America: eastern Canada. South America: western South America, Brazil, and southern South America.
Reference
Aveneae. FTEA.
[GB]

Common Names

English
Animated Oats

Sources

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    • Angiosperm Threat Predictions
    • http://creativecommons.org/licenses/by/4.0
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    • Flora of Tropical East Africa
    • http://creativecommons.org/licenses/by-nc-sa/3.0
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    • 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/
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    • IUCN Red List of Threatened Species
    • http://creativecommons.org/licenses/by-nc-sa/3.0
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    • © Copyright 2023 World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0
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    • The International Plant Names Index and World Checklist of Vascular Plants 2024. 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
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    • Seed Collection Guides
    • http://creativecommons.org/licenses/by-nc-sa/3.0