Poaceae
Bromus

Bromus ayacuchensis Saarela & P.M.Peterson

First published in Sida 22: 919 (2006)
This species is accepted
The native range of this species is Peru. It is a perennial and grows primarily in the subtropical 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: threatened. Confidence: confident
[AERP]

Morphology General Habit
Perennial; caespitose; clumped loosely. Cataphylls evident. Rhizomes short. Basal innovations extravaginal. Culms erect; (30-)50-120 cm long. Culm-internodes distally pilose. Lateral branches lacking. Leaf-sheaths tubular for much of their length; with 0.66-0.75 of their length closed; 8-10 cm long; pilose; with reflexed hairs; outer margin glabrous. Ligule an eciliate membrane; 3-6.6 mm long; pilose on abaxial surface; erose; obtuse. Leaf-blades 20-55 cm long; 3-8 mm wide. Leaf-blade surface pilose; sparsely hairy; hairy abaxially, or on both sides. Leaf-blade margins scabrous. Leaf-blade apex acuminate.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle open; obovate; loose; equilateral, or nodding; 12-26 cm long; 1-8 cm wide. Primary panicle branches ascending, or spreading, or drooping; 2-4 -nate; 1.5-10 cm long. Panicle axis scabrous; with scattered hairs, or glabrous. Spikelets solitary. Fertile spikelets pedicelled.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 4-7 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; compressed strongly; (12-)18-27 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 2-3 mm long.
Fertile
Spikelets comprising 4-7 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; compressed strongly; (12-)18-27 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 2-3 mm long.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; shorter than spikelet. Lower glume lanceolate; 5-8 mm long; 0.66 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume surface glabrous, or pilose. Lower glume apex obtuse. Upper glume lanceolate; 8-11.2 mm long; 0.8-0.9 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume surface glabrous, or pilose. Upper glume apex acute; muticous, or mucronate.
Morphology Reproductive morphology Flowers Florets
Fertile lemma lanceolate; 10-12.6 mm long; chartaceous; keeled; 5-7 -veined. Lemma surface pubescent. Lemma hairs 0.2-0.5 mm long. Lemma apex entire, or dentate; 2 -fid; with lobes 0.2 mm long; awned; 1 -awned. Principal lemma awn apical, or from a sinus; 3-5.5 mm long overall. Palea 9-12 mm long. Palea keels ciliate. Palea apex with excurrent keel veins. Apical sterile florets resembling fertile though underdeveloped.
Morphology Reproductive morphology Flowers
Lodicules 2; elliptic, or obovate; 1-1.3 mm long; membranous. Anthers 3; 3.1-3.8 mm long; yellow, or orange. Ovary with a fleshy appendage above style insertion; pubescent on apex.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; oblanceolate; 5.8-7 mm long; hairy at apex; apex fleshy. Hilum linear; 1 length of caryopsis.
Distribution
South America: western South America.
Reference
Bromeae. Saarela et al 2007.
[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

    • 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