Poaceae
Pappostipa

Pappostipa vaginata (Phil.) Romasch.

First published in J. Bot. Res. Inst. Texas 2: 182 (2008)
This species is accepted
The native range of this species is Bolivia to Argentina. It is a perennial and grows primarily in the temperate biome.

Descriptions

Morphology General Habit
Perennial; caespitose. Butt sheaths dark brown; pilose. Culms 50-70 cm long. Culm-internodes distally glabrous. Leaf-sheaths glabrous on surface. Leaf-sheath oral hairs lacking, or ciliate. Ligule an eciliate membrane; 10-15 mm long. Collar glabrous. Leaf-blades flexuous; persistent, or deciduous at the ligule; filiform; 9-40 cm long; 0.7-1 mm wide. Leaf-blade surface scaberulous; glabrous.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle open; nodding; 10-20 cm long. Spikelets solitary. Fertile spikelets pedicelled. Pedicels scabrous; glabrous.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 17-25 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; curved; 1.5-2 mm long; pubescent; pungent.
Fertile
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 17-25 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; curved; 1.5-2 mm long; pubescent; pungent.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 1 length of upper glume; hyaline; without keels; 1-3 -veined. Lower glume lateral veins absent, or distinct. Lower glume apex attenuate. Upper glume lanceolate; 17-25 mm long; 2-2.5 length of adjacent fertile lemma; hyaline; without keels; 1-3 -veined. Upper glume lateral veins absent, or distinct. Upper glume apex attenuate.
Morphology Reproductive morphology Flowers Florets
Fertile lemma lanceolate; subterete; 7-11 mm long; coriaceous; without keel; 5 -veined. Lemma surface pubescent; hairy all along, or below. Lemma margins convolute; covering most of palea. Lemma apex dentate; 2 -fid; with lobes 1.5-2.5 mm long; pubescent; surmounted by a ring of hairs; with this appendage 2-4 mm long; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 20-46 mm long overall; with 19-30 mm long limb; with twisted column; deciduous; limb glabrous. Column of lemma awn 11-16 mm long; plumose; with 5-10 mm long hairs. Palea 0.66 mm long; 5.5-6 length of lemma; 2 -veined; without keels.
Morphology Reproductive morphology Flowers
Lodicules 3. Anthers 3; 4 mm long. Stigmas 2. Ovary glabrous.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; fusiform; 6 mm long; dark brown. Hilum linear; 1 length of caryopsis.
Distribution
South America: western South America and southern South America.
Reference
Stipeae. Torres 1994.
[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