Genus:
Hordeum L.

Hordeum comosum J.Presl

This species is accepted, and its native range is Chile to Argentina.

[GB]
Morphology General Habit
Perennial; caespitose. Butt sheaths purple; persistent and investing base of culm; with compacted dead sheaths. Culms 10-70 cm long. Leaf-sheaths pubescent. Leaf-sheath auricles absent, or falcate. Ligule a ciliolate membrane; 0.5 mm long; truncate. Leaf-blades flat, or convolute; 3-5 cm long; 1-2 mm wide. Leaf-blade surface pubescent; hairy on both sides.
Morphology Reproductive morphology Inflorescences
Inflorescence composed of racemes; exserted, or embraced at base by subtending leaf. Racemes 1; single; bilateral; 4-10 cm long. Rhachis fragile at the nodes; flattened; glabrous on margins, or ciliate on margins. Spikelet packing broadside to rhachis. Rhachis internodes oblong; 1-2 mm long; falling with spikelet above. Spikelets in threes. Fertile spikelets sessile; 1 in the cluster. Companion sterile spikelets pedicelled; 2 in the cluster. Pedicels oblong; 1-1.5 mm long.
Morphology Reproductive morphology Inflorescences Spikelets
Companion sterile spikelets well-developed; containing empty lemmas; lanceolate; dorsally compressed; 20-30 mm long; shorter than fertile, or as long as fertile; deciduous with the fertile. Companion sterile spikelet glumes similar in width; subulate; 20-30 mm long. Companion sterile spikelet lemmas 1; 10-17 mm long; 1-awned; with 7-12 mm long awn. Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; dorsally compressed; 20-35 mm long; falling entire; deciduous with accessory branch structures.
Sterile
Companion sterile spikelets well-developed; containing empty lemmas; lanceolate; dorsally compressed; 20-30 mm long; shorter than fertile, or as long as fertile; deciduous with the fertile. Companion sterile spikelet glumes similar in width; subulate; 20-30 mm long. Companion sterile spikelet lemmas 1; 10-17 mm long; 1-awned; with 7-12 mm long awn.
Fertile
Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; dorsally compressed; 20-35 mm long; falling entire; deciduous with accessory branch structures.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes collateral; similar; exceeding apex of florets; gaping. Lower glume subulate; 20-35 mm long; 1 length of upper glume; coriaceous. Lower glume surface scabrous. Upper glume subulate; 20-35 mm long; coriaceous. Upper glume surface scabrous.
Morphology Reproductive morphology Flowers Florets
Fertile lemma lanceolate; 7-15 mm long; coriaceous; yellow, or purple; without keel; 5 -veined. Lemma surface scaberulous; rough above. Lemma apex acuminate; awned; 1 -awned. Principal lemma awn 15-25 mm long overall. Palea 6-10.5 mm long. Palea surface scabrous. Rhachilla extension 2.5-6 mm long.
Morphology Reproductive morphology Flowers
Lodicules 2; 1-2 mm long; ciliate. Anthers 3; 2-4.3 mm long. Ovary pubescent on apex.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; hairy at apex. Hilum linear.
Distribution
South America: southern South America. Antarctic: Subantarctic islands.
Reference
Triticeae. Fl Pat 1995.

Native to:

Argentina Northwest, Argentina South, Chile Central, Chile North, Chile South

Introduced into:

Falkland Is.

Hordeum comosum J.Presl appears in other Kew resources:

Date Reference Identified As Barcode Type Status Has image?
Jan 1, 1937 Catamarca K000308568 lectotype Yes

First published in C.B.Presl, Reliq. Haenk. 1: 327 (1830)

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.
  • Zuloaga, F.O., Morrone, O. , Belgrano, M.J., Marticorena, C. & Marchesi, E. (eds.) (2008). Catálogo de las Plantas Vasculares del Cono Sur Monographs in Systematic Botany from the Missouri Botanical Garden 107: 1-3348. Missouri Botanical Garden.

Literature

Kew Backbone Distributions

  • Broughton, D.A. & McAdam, J.H. (2002). The non-native vascular flora of the Falkland islands Botanical Journal of Scotland 54: 153-190.
  • Zuloaga, F.O., Morrone, O. , Belgrano, M.J., Marticorena, C. & Marchesi, E. (eds.) (2008). Catálogo de las Plantas Vasculares del Cono Sur Monographs in Systematic Botany from the Missouri Botanical Garden 107: 1-3348. Missouri Botanical Garden.

  • GrassBase - The Online World Grass Flora

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

  • Herbarium Catalogue Specimens

    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 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