Pappostipa vatroensis (F.A.Roig) Romasch.

First published in J. Bot. Res. Inst. Texas 2: 184 (2008)
This species is accepted
The native range of this species is Argentina. It is a perennial and grows primarily in the temperate biome.

Descriptions

Morphology General Habit
Perennial; caespitose. Rhizomes elongated. Stolons present. Butt sheaths dark brown; pubescent. Culms 40-50 cm long; 3-4 -noded. Culm-internodes smooth, or scaberulous; distally pubescent. Culm-nodes brown; glabrous. Leaf-sheaths mostly shorter than adjacent culm internode, or longer than adjacent culm internode; pilose. Leaf-sheath oral hairs ciliate. Ligule an eciliate membrane; 6 mm long; 1 mm long on basal shoots. Leaf-blades flexuous; filiform; conduplicate; 10-15 cm long; 1 mm wide. Leaf-blade surface smooth; glabrous. Leaf-blade apex acuminate.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle; comprising 20-25 fertile spikelets. Panicle open; linear; 20-25 cm long. Spikelets solitary. Fertile spikelets pedicelled. Pedicels 0.5-4 mm long; villous; hairy at tip; with 3 mm long hairs.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 36-45 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; curved; 2.5-3 mm long; pubescent; acute.
Fertile
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 36-45 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; curved; 2.5-3 mm long; pubescent; acute.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 36-45 mm long; 1.1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex attenuate. Upper glume lanceolate; 34-40 mm long; membranous; without keels; 3 -veined. Upper glume apex attenuate.
Morphology Reproductive morphology Flowers Florets
Fertile lemma lanceolate; subterete; 14-18 mm long; coriaceous; without keel; 5 -veined. Lemma surface pubescent. Lemma margins convolute; covering most of palea. Lemma apex awned; 1 -awned. Principal lemma awn geniculate; 100-165 mm long overall; with twisted column. Column of lemma awn 7-21 mm long; hirsute; hairy on lower part. Palea 9-13 mm long; 2 -veined; without keels. Palea surface pubescent.
Morphology Reproductive morphology Flowers
Lodicules 3. Anthers 3; yellow; anther tip smooth. Stigmas 2. Ovary glabrous.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; fusiform; 9 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
  • 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