Poaceae
Pappostipa

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

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

  • 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