Pappostipa chubutensis (Speg.) Romasch.

First published in J. Bot. Res. Inst. Texas 2: 185 (2008)
This species is accepted
The native range of this species is S. Argentina. It is a perennial and grows primarily in the temperate biome.

Descriptions

Morphology General Habit
Perennial; caespitose. Butt sheaths dark brown. Culms 15-35 cm long; 2-3 -noded. Culm-nodes swollen. Leaf-sheaths mostly shorter than adjacent culm internode. Leaf-sheath oral hairs ciliate; 1.5 mm long. Ligule a ciliolate membrane. Leaf-blades straight, or curved; deciduous at the ligule; filiform; conduplicate; 8-20 cm long; 1 mm wide. Leaf-blade surface smooth. Leaf-blade apex muticous, or pungent.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle; embraced at base by subtending leaf. Panicle open; oblong; dense; 5-11 cm long; 2-3 cm wide. Spikelets solitary. Fertile spikelets pedicelled. Pedicels scabrous; ciliate; hairy at tip.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 17-24 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; curved; 1.5-2 mm long; pilose; acute.
Fertile
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 17-24 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; curved; 1.5-2 mm long; pilose; acute.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 17-24 mm long; 1 length of upper glume; membranous; without keels; 3 -veined. Lower glume apex acuminate. Upper glume lanceolate; 17-24 mm long; membranous; without keels; 3 -veined. Upper glume apex acuminate.
Morphology Reproductive morphology Flowers Florets
Fertile lemma lanceolate; subterete; 7-9 mm long; coriaceous; without keel; 5 -veined. Lemma surface pilose. Lemma margins convolute; covering most of palea. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 27-50 mm long overall; with twisted column. Column of lemma awn 9-13 mm long; pubescent. Palea 5-6 mm long; 2 -veined; without keels. Palea surface pilose.
Morphology Reproductive morphology Flowers
Lodicules 3. Anthers 3. Stigmas 2. Ovary glabrous.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; fusiform; 6 mm long. Hilum linear.
Distribution
South America: southern South America.
Reference
Stipeae. Fl Pat 1995.
[GB]

Sources

  • 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 2023. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2022 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 2023. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2022 International Plant Names Index and World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0