Poaceae
Pappostipa

Pappostipa arenicola (F.A.Roig) Ciald.

First published in Darwiniana 48: 170 (2010)
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 purple. Culms erect; 15-25 cm long; 1-1.5 mm diam.; 5-8 -noded. Culm-internodes 10-25 cm long; smooth. Lateral branches ample. Leaf-sheaths striately veined; glabrous on surface; outer margin hairy. Ligule an eciliate membrane; 7-12 mm long; 2-3 mm long on basal shoots; hyaline. Collar pubescent. Leaf-blades filiform; conduplicate; 15-29 cm long; 0.5-1 mm wide. Leaf-blade surface smooth; glabrous. Leaf-blade apex attenuate.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle; comprising 11-12 fertile spikelets; shorter than basal leaves; embraced at base by subtending leaf. Panicle open; lanceolate to elliptic; 9-14 cm long; bearing few spikelets. Spikelets solitary. Fertile spikelets pedicelled. Pedicels angular; ciliate; hairy at tip.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 25-31 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; curved; 2.8-3 mm long; pubescent; acute.
Fertile
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 25-31 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; curved; 2.8-3 mm long; pubescent; acute.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 25-31 mm long; 1.1-1.2 length of upper glume; hyaline; without keels; 1 -veined. Lower glume lateral veins absent. Lower glume apex attenuate. Upper glume lanceolate; 22-27 mm long; 2 length of adjacent fertile lemma; hyaline; without keels. Upper glume apex attenuate.
Morphology Reproductive morphology Flowers Florets
Fertile lemma lanceolate; subterete; 11-13 mm long; coriaceous; without keel; 5 -veined. Lemma surface pubescent. Lemma margins convolute; covering most of palea. Lemma apex surmounted by a ring of hairs; awned; 1 -awned. Principal lemma awn geniculate; 70-80 mm long overall; with 54-62 mm long limb; with twisted column. Column of lemma awn 16-20 mm long; plumose. Palea tightly convolute around flower; 9.5-10 mm long; 2 -veined; 2-keeled. Palea keels ciliolate.
Morphology Reproductive morphology Flowers
Lodicules 2; 3.5-4 mm long. Stigmas 2. Styles free to the base.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; fusiform; 9-10 mm long. Hilum linear.
Distribution
South America: southern South America.
Reference
Stipeae. Roig 2004.
[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