Poaceae
Pappostipa

Pappostipa malalhuensis (F.A.Roig) Romasch.

First published in J. Bot. Res. Inst. Texas 2: 183 (2008)
This species is accepted
The native range of this species is W. Argentina. It is a perennial and grows primarily in the temperate biome.

Descriptions

Morphology General Habit
Perennial. Butt sheaths yellow; glabrous. Culms 30-40 cm long; 1 mm diam.; 2-3 -noded. Culm-internodes distally glabrous, or pubescent. Culm-nodes flush with internodes; brown; glabrous. Leaf-sheath oral hairs lacking, or pubescent. Ligule an eciliate membrane; 3 mm long; 1 mm long on basal shoots. Leaf-blades conduplicate; 15-25 cm long; 1 mm wide. Leaf-blade surface glabrous. Leaf-blade apex attenuate.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle; comprising 15-25 fertile spikelets. Panicle open; oblong; 8-15 cm long; 0.5-1 cm wide. Spikelets solitary. Fertile spikelets pedicelled. Pedicels 8-14 mm long; ciliate; hairy above.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 29-32 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; curved; 3 mm long; pubescent; pungent.
Fertile
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 29-32 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; curved; 3 mm long; pubescent; pungent.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 29-32 mm long; 1.05 length of upper glume; membranous; without keels. Lower glume apex attenuate. Upper glume lanceolate; 27-31 mm long; membranous; without keels. Upper glume apex attenuate.
Morphology Reproductive morphology Flowers Florets
Fertile lemma lanceolate; subterete; 10-12 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; 90-110 mm long overall; with twisted column. Column of lemma awn 17-18 mm long; plumose; with 4-5 mm long hairs. Palea 6-8 mm long; 0-1 -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. 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