Pappostipa atacamensis (Parodi) Romasch.

First published in J. Bot. Res. Inst. Texas 2: 184 (2008)
This species is accepted
The native range of this species is N. & N. Central Chile to NW. Argentina. It is a perennial and grows primarily in the desert or dry shrubland biome.

Descriptions

Morphology General Habit
Perennial; caespitose. Culms erect; 15-25 cm long; 0.6-1 mm diam. Culm-internodes distally glabrous, or pubescent. Ligule an eciliate membrane; 2-3 mm long; 0.3-0.5 mm long on basal shoots. Leaf-blades filiform; convolute; 4-8 cm long; 0.5 mm wide. Leaf-blade surface ribbed.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle; embraced at base by subtending leaf. Panicle open; linear; 4-6 cm long. Spikelets solitary. Fertile spikelets pedicelled. Pedicels ciliate; hairy at tip.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 18 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus evident; curved; 0.75 mm long; glabrous; pungent.
Fertile
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 18 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus evident; curved; 0.75 mm long; glabrous; 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; membranous; without keels; 3 -veined. Lower glume apex acuminate. Upper glume lanceolate; 18 mm long; membranous; without keels; 3 -veined. Upper glume apex acuminate.
Morphology Reproductive morphology Flowers Florets
Fertile lemma lanceolate; subterete; 6.5 mm long; coriaceous; without keel; 5 -veined. Lemma surface pubescent; hairy above. Lemma margins convolute; covering most of palea. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn geniculate; 20 mm long overall; with twisted column. Column of lemma awn 10-11 mm long; plumose; with 2-5 mm long hairs. Palea 2 -veined; without keels. Palea surface pubescent.
Morphology Reproductive morphology Flowers
Lodicules 3. Anthers 3. Stigmas 2. Ovary glabrous.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; fusiform; 5 mm long. Hilum linear.
Distribution
South America: southern South America.
Reference
Stipeae. Matthei 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