Pappostipa maeviae (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 S. Argentina. It is a perennial and grows primarily in the temperate biome.

Descriptions

Morphology General Habit
Perennial; caespitose. Butt sheaths red; pilose. Culms 5-7 cm long; 2 -noded. Culm-internodes distally hirsute. Culm-nodes constricted. Leaf-sheaths longer than adjacent culm internode; pubescent. Ligule a ciliolate membrane; 2 mm long; 0.25-0.5 mm long on basal shoots; pubescent on abaxial surface; acute. Leaf-blades curved, or flexuous; conduplicate; 10-20 cm long; 1 mm wide; stiff. Leaf-blade surface glabrous; hairless except near base. Leaf-blade apex pungent.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle; comprising 6-7 fertile spikelets; shorter than basal leaves; embraced at base by subtending leaf. Panicle open; oblong; 3 cm long; 1-1.5 cm wide; bearing few spikelets. Spikelets solitary. Fertile spikelets pedicelled. Pedicels 3-7 mm long; villous.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 18-22 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; curved; 1.5-2 mm long; pubescent; acute.
Fertile
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 18-22 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; curved; 1.5-2 mm long; pubescent; acute.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 18-22 mm long; 1.05 length of upper glume; membranous; without keels; 1 -veined. Lower glume primary vein ciliate. Lower glume lateral veins absent. Lower glume surface puberulous. Lower glume apex acuminate. Upper glume lanceolate; 17-20 mm long; membranous; without keels; 3 -veined. Upper glume primary vein ciliate. Upper glume surface puberulous. Upper glume apex acuminate.
Morphology Reproductive morphology Flowers Florets
Fertile lemma lanceolate; subterete; 7-8 mm long; coriaceous; without keel; 5 -veined. Lemma surface villous. Lemma margins convolute; covering most of palea. Lemma hairs 3-4 mm long. Lemma apex dentate; 2 -fid; with lobes 2 mm long; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 16-20 mm long overall; with twisted column; limb glabrous. Column of lemma awn 7-9 mm long; plumose. Palea 2.6-3 mm long; 0 -veined; without keels.
Morphology Reproductive morphology Flowers
Lodicules 3. Anthers 3. 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