Poaceae
Pappostipa

Pappostipa sorianoi (Parodi) Romasch.

First published in J. Bot. Res. Inst. Texas 2: 184 (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 yellow; pubescent. Culms 15-20 cm long; 0.3-0.5 mm diam.; 2-3 -noded. Culm-internodes antrorsely scabrous. Culm-nodes glabrous. Leaf-sheaths 5-7 cm long. Ligule an eciliate membrane; acute. Leaf-blades filiform; conduplicate; 8-10 cm long; 0.3-0.4 mm wide. Leaf-blade surface glabrous. Leaf-blade apex acute.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle; comprising 10 fertile spikelets; exserted, or embraced at base by subtending leaf. Panicle open; lanceolate; 3-7 cm long; bearing few spikelets. Spikelets solitary. Fertile spikelets pedicelled. Pedicels 2-7 mm long; scabrous; ciliate; hairy above.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 19-26 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus evident; 2 mm long; pubescent; pungent.
Fertile
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 19-26 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus evident; 2 mm long; pubescent; pungent.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 19-26 mm long; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex attenuate. Upper glume lanceolate; 19-26 mm long; membranous; without keels; 3 -veined. Upper glume apex attenuate.
Morphology Reproductive morphology Flowers Florets
Fertile lemma lanceolate; subterete; 8-9 mm long; coriaceous; without keel; 5 -veined. Lemma surface pubescent; hairy below. Lemma margins convolute; covering most of palea. Lemma apex dentate; 2 -fid; with lobes 2 mm long; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 30-40 mm long overall; with twisted column. Column of lemma awn 11-14 mm long; plumose; with 5-6 mm long hairs. Palea 5-6 mm long; 2 -veined; without keels. Palea surface pubescent.
Morphology Reproductive morphology Flowers
Lodicules 3. Anthers 3; yellow, or purple; anther tip smooth. Stigmas 2. Ovary glabrous.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; fusiform. 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

  • 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