Pappostipa speciosa (Trin. & Rupr.) Romasch.

First published in J. Bot. Res. Inst. Texas 2: 182 (2008)
This species is accepted
The native range of this species is W. & S. Central U.S.A. to NW. Mexico, N. & Central Chile to Argentina. It is a perennial and grows primarily in the temperate biome.

Descriptions

Morphology General Habit
Perennial; caespitose. Butt sheaths dark brown; pubescent. Culms erect; 25-90 cm long. Culm-nodes brown. Leaf-sheaths longer than adjacent culm internode. Leaf-sheath oral hairs lacking to pubescent. Ligule an eciliate membrane. Collar glabrous. Leaf-blades filiform; conduplicate; 5-42 cm long; 0.7-0.8 mm wide. Leaf-blade apex pungent.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle open; nodding; 7-14 cm long. Spikelets solitary. Fertile spikelets pedicelled. Pedicels ciliate; hairy all along but hairs longer above.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 25-40 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; curved; 3-3.5 mm long; pubescent; pungent.
Fertile
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 25-40 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; curved; 3-3.5 mm long; pubescent; pungent.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 1 length of upper glume; hyaline; without keels; 3-5 -veined. Lower glume surface asperulous. Lower glume apex acuminate. Upper glume lanceolate; 25-40 mm long; 2-2.5 length of adjacent fertile lemma; hyaline; without keels; 3-5 -veined. Upper glume surface asperulous. Upper glume apex acuminate.
Morphology Reproductive morphology Flowers Florets
Fertile lemma lanceolate; subterete; 11-14 mm long; coriaceous; without keel; 5 -veined. Lemma surface pubescent; hairy all along. Lemma margins convolute; covering most of palea. Lemma apex dentate; 2 -fid; with lobes 1-1.5 mm long; pubescent; surmounted by a ring of hairs; with this appendage 0.5-1 mm long; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 40-85 mm long overall; with 20-70 mm long limb; with twisted column; deciduous; limb glabrous. Column of lemma awn 10-25 mm long; plumose; with 5-10 mm long hairs. Palea 4.5-5 mm long; 0.33-0.5 length of lemma; 2 -veined; without keels.
Morphology Reproductive morphology Flowers
Lodicules 3. Anthers 3; 4.5-5 mm long; anther tip smooth. Stigmas 2. Ovary glabrous.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; fusiform; 8-12 mm long; light brown. Hilum linear; 1 length of caryopsis.
Distribution
North America: northwest USA, southwest USA, and Mexico. South America: western South America and southern South America.
Reference
Stipeae. Torres 1994.
[GB]

Sources

  • GrassBase - The Online World Grass Flora

    • http://creativecommons.org/licenses/by-nc-sa/3.0
  • Herbarium Catalogue Specimens

    • Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/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