Poaceae
Pappostipa

Pappostipa hieronymusii (Pilg.) 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; clumped densely. Basal innovations intravaginal. Culms 15-25 cm long; 1 -noded. Leaf-sheaths 4-8 cm long; pubescent. Leaf-sheath oral hairs ciliate. Ligule a ciliolate membrane. Leaf-blades convolute; 7-25 cm long; 0.8 mm wide; stiff. Leaf-blade surface pubescent; hairy adaxially. Leaf-blade apex acute; pungent.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle; terminal, or terminal and axillary; subtended by an inflated leaf-sheath; embraced at base by subtending leaf. Panicle contracted; linear; 4-15 cm long. Panicle axis puberulous. Panicle branches puberulous. Spikelets solitary. Fertile spikelets pedicelled.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 17-22 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; 1.5-2 mm long; pubescent; pungent.
Fertile
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 17-22 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; 1.5-2 mm long; pubescent; pungent.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 17-22 mm long; 1 length of upper glume; membranous; much thinner on margins; purple; without keels. Lower glume apex attenuate. Upper glume lanceolate; 17-22 mm long; membranous; with hyaline margins; purple; without keels. Upper glume apex attenuate.
Morphology Reproductive morphology Flowers Florets
Fertile lemma lanceolate; subterete; 8-9 mm long; coriaceous; yellow; without keel; 5 -veined. Lemma surface pubescent; hairy below. Lemma margins convolute; covering most of palea. Lemma apex dentate; 2 -fid; with lobes 1.5 mm long; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 18-25 mm long overall; with 10-15 mm long limb; with twisted column. Column of lemma awn 10 mm long; plumose; with 5-6 mm long hairs. Palea 5 mm long.
Morphology Reproductive morphology Flowers
Anthers 3; 4.5 mm long.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp.
Distribution
South America: southern South America.
Reference
Stipeae. Parodi 1997.
[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