Pappostipa semperiana (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 N. Argentina. It is a perennial and grows primarily in the temperate biome.

Descriptions

Extinction risk predictions for the world's flowering plants to support their conservation (2024). Bachman, S.P., Brown, M.J.M., Leão, T.C.C., Lughadha, E.N., Walker, B.E. https://nph.onlinelibrary.wiley.com/doi/full/10.1111/nph.19592

Conservation
Predicted extinction risk: threatened. Confidence: low confidence
[AERP]

Morphology General Habit
Perennial; caespitose. Culms 20-50 cm long; 1.5-2 mm diam. Culm-internodes distally pubescent. Culm-nodes black; glabrous. Leaf-sheaths outer margin hairy. Leaf-sheath oral hairs ciliate. Ligule an eciliate membrane; 2-4 mm long; hyaline. Leaf-blades filiform; convolute; 1 mm wide. Leaf-blade surface pubescent; densely hairy; hairy adaxially. Leaf-blade margins ciliate.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle; comprising 20-25 fertile spikelets. Panicle open; oblong; 8-10 cm long; 3-5 cm wide; bearing few spikelets. Spikelets solitary. Fertile spikelets pedicelled.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets linear; subterete; 29-32 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; 2 mm long; pubescent; pungent.
Fertile
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets linear; subterete; 29-32 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; 2 mm long; pubescent; pungent.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 29-32 mm long; 1.1 length of upper glume; hyaline; without keels. Lower glume apex attenuate. Upper glume lanceolate; 27-28 mm long; 2.5 length of adjacent fertile lemma; hyaline; without keels. Upper glume apex attenuate.
Morphology Reproductive morphology Flowers Florets
Fertile lemma linear to lanceolate; subterete; 10-13 mm long; coriaceous; without keel; 5 -veined. Lemma surface pubescent. Lemma margins convolute; covering most of palea. Lemma apex dentate; 2 -fid; surmounted by a ring of hairs; with this appendage 3-4 mm long; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 5-75 mm long overall; with 40-55 mm long limb; with twisted column. Column of lemma awn 16-20 mm long; plumose; with 5-6 mm long hairs. Palea 5-6 mm long; 0.5 length of lemma; 2 -veined; without keels.
Morphology Reproductive morphology Flowers
Anthers 3; yellow. Stigmas 2.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; fusiform. Hilum linear.
Distribution
South America: southern South America.
Reference
Stipeae. Roig 2005.
[GB]

Sources

  • Angiosperm Extinction Risk Predictions v1

    • Angiosperm Threat Predictions
    • http://creativecommons.org/licenses/by/4.0
  • GrassBase - The Online World Grass Flora

    • Clayton, W.D., Vorontsova, M.S., Harman, K.T. and Williamson, H. (2006 onwards). 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 2024. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 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 2024. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 International Plant Names Index and World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0