Poaceae
Pappostipa

Pappostipa ruiz-lealii (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 NW. Argentina. It is a perennial and grows primarily in the temperate biome.

Descriptions

Morphology General Habit
Perennial; caespitose. Culms 25-30 cm long. Culm-internodes distally pubescent. Culm-nodes constricted; brown; glabrous. Leaf-sheaths longer than adjacent culm internode; glabrous on surface; outer margin hairy. Ligule an eciliate membrane; 0.5-1 mm long; hyaline. Leaf-blades filiform; convolute; 1 mm wide; stiff. Leaf-blade surface puberulous; hairy adaxially. Leaf-blade apex pungent.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle; comprising 8-15 fertile spikelets. Panicle open; oblong; 6-9 cm long; bearing few spikelets. Spikelets solitary. Fertile spikelets pedicelled.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets linear; subterete; 15-20 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; curved; 2-3 mm long; bearded; acute.
Fertile
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets linear; subterete; 15-20 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; curved; 2-3 mm long; bearded; acute.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 15-20 mm long; 1 length of upper glume; hyaline; much thinner above; much thinner on margins; purple; without keels. Lower glume apex acuminate. Upper glume lanceolate; 15-20 mm long; 1.5-2 length of adjacent fertile lemma; hyaline; much thinner above; with hyaline margins; purple; without keels. Upper glume apex acuminate.
Morphology Reproductive morphology Flowers Florets
Fertile lemma linear to lanceolate; subterete; 10-11 mm long; coriaceous; light brown; without keel; 5 -veined. Lemma surface pubescent; hairy below. 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; 22-33 mm long overall; with 11-19 mm long limb; with twisted column. Column of lemma awn 11-14 mm long; plumose; with 5-6 mm long hairs. Palea 9-10 mm long; 0.9 length of lemma; 2 -veined; without keels.
Morphology Reproductive morphology Flowers
Anthers 3; purple. Stigmas 2.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; fusiform; 9 mm long. 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