Festuca pallescens (St.-Yves) Parodi

First published in Revista Argent. Agron. 20: 206 (1953)
This species is accepted
The native range of this species is S. Chile to W. Central & S. Argentina. It is a perennial 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
Perennial; caespitose. Basal innovations intravaginal. Culms erect; 25-80 cm long. Lateral branches lacking. Leaf-sheaths open for most of their length; smooth, or scaberulous. Ligule a ciliolate membrane; 0.5 mm long; glabrous on abaxial surface, or pubescent on abaxial surface. Leaf-blades filiform; conduplicate; 5-35 cm long; 1-1.5 mm wide; herbaceous; glaucous. Leaf-blade surface glabrous. Leaf-blade apex acute.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle open; lanceolate; 5-15 cm long. Panicle axis scaberulous. Panicle branches scaberulous. Spikelets solitary. Fertile spikelets pedicelled. Pedicels scaberulous.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 5-7 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 9-15 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 1.5-2.5 mm long.
Fertile
Spikelets comprising 5-7 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 9-15 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 1.5-2.5 mm long.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 4.5-5 mm long; 0.75 length of upper glume; chartaceous; without keels; 1 -veined. Lower glume primary vein smooth, or scabrous. Lower glume lateral veins absent. Lower glume surface smooth, or asperulous; rough at apex. Lower glume apex acuminate. Upper glume lanceolate; 5.5-7.5 mm long; 0.66-0.75 length of adjacent fertile lemma; chartaceous; without keels; 3 -veined. Upper glume primary vein smooth, or scabrous. Upper glume surface smooth, or asperulous; rough at apex. Upper glume apex acuminate.
Morphology Reproductive morphology Flowers Florets
Fertile lemma lanceolate; 6.5-11 mm long; chartaceous; without keel; 5 -veined. Lemma surface scaberulous; rough below. Lemma apex acute; awned; 1 -awned. Principal lemma awn 1-3 mm long overall. Palea 1 length of lemma; 2 -veined. Palea keels ciliolate. Palea surface scabrous. Apical sterile florets resembling fertile though underdeveloped.
Morphology Reproductive morphology Flowers
Anthers 3; 3.5-4.5 mm long. Ovary pubescent on apex.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp. Hilum linear; 0.75 length of caryopsis.
Distribution
South America: southern South America.
Reference
Poeae. Fl Pat 1995.
[GB]

Morphology General Habit
Perennial; caespitose. Basal innovations intravaginal. Culms erect; 25-80 cm long. Lateral branches lacking. Leaf-sheaths open for most of their length; smooth, or scaberulous. Ligule a ciliolate membrane; 0.5 mm long; glabrous on abaxial surface, or pubescent on abaxial surface. Leaf-blades filiform; conduplicate; 5-35 cm long; 1-1.5 mm wide; herbaceous; glaucous. Leaf-blade venation comprising 11 vascular bundles; with 8 inner ridges; with 17 subepidermal sclerenchyma strands; with subepidermal sclerenchyma free from veins; with sclerenchyma strands widened to form a discontinuous subepidermal layer. Leaf-blade surface glabrous. Leaf-blade apex acute.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle open; lanceolate; 5-15 cm long. Panicle axis scaberulous. Panicle branches scaberulous. Spikelets solitary. Fertile spikelets pedicelled. Pedicels scaberulous.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 5-7 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 19-22.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 1.5-2.5 mm long.
Fertile
Spikelets comprising 5-7 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 19-22.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 1.5-2.5 mm long.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 10-12 mm long; 0.75 length of upper glume; chartaceous; without keels; 1 -veined. Lower glume primary vein smooth, or scabrous. Lower glume lateral veins absent. Lower glume surface smooth, or asperulous; rough at apex. Lower glume apex acuminate. Upper glume lanceolate; 12-15 mm long; 0.66-0.75 length of adjacent fertile lemma; chartaceous; without keels; 3 -veined. Upper glume primary vein smooth, or scabrous. Upper glume surface smooth, or asperulous; rough at apex. Upper glume apex acuminate.
Morphology Reproductive morphology Flowers Florets
Fertile lemma lanceolate; 9-15 mm long; chartaceous; without keel; 5 -veined. Lemma surface scaberulous; rough below. Lemma apex acute; awned; 1 -awned. Principal lemma awn 1-3 mm long overall. Palea 1 length of lemma; 2 -veined. Palea keels ciliolate. Palea surface scabrous. Apical sterile florets resembling fertile though underdeveloped.
Morphology Reproductive morphology Flowers
Anthers 3; 4.5-5 mm long. Ovary glabrous.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; glabrous. Hilum linear; 0.75 length of caryopsis.
Distribution
South America: southern South America.
Reference
Poeae. Alexeev 1997.
[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
  • Kew Backbone Distributions

    • 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 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 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