Genus:
Holcus L.

Holcus gayanus Boiss.

This species is accepted, and its native range is Iberian Peninsula.

[GB]
Morphology General Habit
Annual. Culms geniculately ascending, or decumbent; 8-40(-75) cm long. Culm-nodes glabrous. Leaf-sheaths loose; pubescent. Ligule an eciliate membrane; 1-2.5 mm long; pubescent on abaxial surface; erose, or lacerate. Leaf-blades flat, or convolute; 3-40 cm long; 0.5-3 mm wide; mid-green, or grey-green. Leaf-blade surface pubescent.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle contracted; oblong; 1-6 cm long; 1-2 cm wide. Panicle branches pubescent. Spikelets solitary. Fertile spikelets pedicelled.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 2 fertile florets; with a barren rhachilla extension. Spikelets elliptic, or oblong; laterally compressed; 6-11 mm long; falling entire; readily shedding fertile florets. Floret callus pubescent.
Fertile
Spikelets comprising 2 fertile florets; with a barren rhachilla extension. Spikelets elliptic, or oblong; laterally compressed; 6-11 mm long; falling entire; readily shedding fertile florets. Floret callus pubescent.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 5.5-8.5 mm long; 0.75-1 length of upper glume; chartaceous; 1-keeled; 1 -veined. Lower glume primary vein scaberulous. Lower glume lateral veins absent. Lower glume apex setaceously attenuate. Upper glume lanceolate, or ovate; 6-11 mm long; 2.5-3.5 length of adjacent fertile lemma; chartaceous; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume surface scabrous; rough on veins. Upper glume apex setaceously attenuate.
Morphology Reproductive morphology Flowers Florets
Fertile florets all alike, or with the lowest dissimilar. Lowest fertile lemma muticous, or awned. Fertile lemma ovate; 2.4-3 mm long; cartilaginous; shiny; without keel; 5 -veined. Lemma apex acute; awned; 1 -awned. Principal lemma awn subapical; geniculate; 6-8 mm long overall; clearly exserted from spikelet; with twisted column. Palea 1 length of lemma. Rhachilla extension 0.3 mm long; pubescent.
Morphology Reproductive morphology Flowers
Anthers 3; 2-2.5 mm long. Ovary glabrous.
Morphology Reproductive morphology Fruits
Caryopsis 2 mm long.
Distribution
Europe: southwestern.
Reference
Aveneae. Gr Extremadura.

Native to:

Portugal, Spain

Holcus gayanus Boiss. appears in other Kew resources:

First published in Voy. Bot. Espagne 2: 637 (1842)

Accepted by

  • Clayton, W.D., Harman, K.T. & Williamson, H. (2006). World Grass Species - Synonymy database The Board of Trustees of the Royal Botanic Gardens, Kew.
  • Tutin, T.G. & al. (eds.) (1980). Flora Europaea 5: 1-452. Cambridge University Press.

Literature

Kew Backbone Distributions

  • Tutin, T.G. & al. (eds.) (1980). Flora Europaea 5: 1-452. Cambridge University Press.

  • GrassBase - The Online World Grass Flora

    http://creativecommons.org/licenses/by-nc-sa/3.0

  • Kew Backbone Distributions

    The International Plant Names Index and World Checklist of Selected Plant Families 2022. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
    © Copyright 2017 World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

  • Kew Names and Taxonomic Backbone

    The International Plant Names Index and World Checklist of Selected Plant Families 2022. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
    © Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0