Pappostipa humilis (Cav.) Romasch.

This species is accepted, and its native range is Argentina to S. Chile.

[GB]
Morphology General Habit
Perennial; caespitose. Stolons present. Butt sheaths yellow. Culms 20-40 cm long; 1 mm diam.; 2-3 -noded. Culm-internodes smooth; distally glabrous, or pubescent. Culm-nodes brown; glabrous. Leaf-sheaths smooth; glabrous on surface; outer margin hairy. Ligule an eciliate membrane, or a ciliolate membrane; 3-4 mm long; 0.2-0.3 mm long on basal shoots; acute. Leaf-blades filiform; conduplicate; 10-30 cm long; 0.5 mm wide. Leaf-blade surface ribbed; scaberulous; glabrous.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle; embraced at base by subtending leaf. Panicle contracted; 5-9 cm long; 0.5-1 cm wide; bearing few spikelets. Spikelets solitary. Fertile spikelets pedicelled. Pedicels 2-7 mm long; scabrous; tip widened.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 18-22 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; 1.5-2 mm long; pilose; pungent.
Fertile
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 18-22 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; 1.5-2 mm long; pilose; pungent.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 18-22 mm long; 1.05 length of upper glume; membranous; 1-keeled; 3 -veined. Lower glume primary vein ciliate. Lower glume apex attenuate. Upper glume lanceolate; 16-20 mm long; membranous; without keels; 3 -veined. Upper glume apex attenuate.
Morphology Reproductive morphology Flowers Florets
Fertile lemma lanceolate; subterete; 7-11 mm long; coriaceous; without keel; 5 -veined. Lemma surface pubescent; hairy below. Lemma margins convolute; covering most of palea. Lemma apex awned; 1 -awned. Principal lemma awn geniculate; 35-75 mm long overall; with twisted column. Column of lemma awn 12-25 mm long; plumose; hairy on upper part; with 8-10 mm long hairs. Palea 4-5 mm long; 2 -veined; without keels.
Morphology Reproductive morphology Flowers
Lodicules 3. Anthers 3; anther tip smooth. Stigmas 2. Ovary glabrous.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; fusiform; 6-7 mm long; dark brown. Hilum linear.
Distribution
South America: southern South America.
Reference
Stipeae. Fl Pat 1995.

Native to:

Argentina Northeast, Argentina Northwest, Argentina South, Chile South

Pappostipa humilis (Cav.) Romasch. appears in other Kew resources:

First published in J. Bot. Res. Inst. Texas 2: 185 (2008)

Accepted by

  • Sclovich, S.E., Giussani, L.M., Ciadella, A.M. & Sede, S.M. (2015). Phylogenetic analysis of Jarava (Poaceae, Pooideae, Stipeae) and related genera: testing the value of the awn indumendum in the circumscription of Jarava. Plant Systematics and Evolution 301: 1625-1641.

Literature

Kew Backbone Distributions

  • Zuloaga, F.O., Morrone, O. , Belgrano, M.J., Marticorena, C. & Marchesi, E. (eds.) (2008). Catálogo de las Plantas Vasculares del Cono Sur. Monographs in Systematic Botany from the Missouri Botanical Garden 107: 1-3348. Missouri Botanical Garden.

  • 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 Selected Plant Families 2022. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
    © Copyright 2017 World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

  • Kew Names and Taxonomic Backbone

    The International Plant Names Index and World Checklist of Selected Plant Families 2022. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
    © Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0