Poaceae
Danthonia

Danthonia rugoloana Sulekic

First published in Darwiniana 37: 341 (1999)
This species is accepted
The native range of this species is Argentina (Salta). It is a perennial and grows primarily in the subtropical biome.

Descriptions

Extinction risk predictions for the world's flowering plants to support their conservation (2024). Bachman, S.P., Brown, M.J.M., Leão, T.C.C., Lughadha, E.N., Walker, B.E. https://nph.onlinelibrary.wiley.com/doi/full/10.1111/nph.19592

Conservation
Predicted extinction risk: threatened. Confidence: confident
[AERP]

Morphology General Habit
Perennial; caespitose; clumped densely. Rhizomes short. Culms erect; 4-16 cm long; 1 -noded. Culm-nodes glabrous, or pubescent. Leaf-sheaths striately veined; glabrous on surface, or pilose. Ligule a fringe of hairs; 0.3-0.6 mm long. Leaf-blades curved; filiform; involute; 0.3-0.6 cm long; 0.5-1 mm wide. Leaf-blade surface scaberulous; rough abaxially; pilose; hairy adaxially. Leaf-blade apex acute; hooded.
Morphology Reproductive morphology Inflorescences
Inflorescence comprising only a few spikelets; comprising 1-3 fertile spikelets; bracteate at pedicel base. Peduncle hirsute above. Spikelets solitary. Fertile spikelets pedicelled. Pedicels 2-8 mm long; ciliate.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 4-6 fertile florets; with diminished florets at the apex. Spikelets elliptic; laterally compressed; 10-14 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus evident; 0.4-0.7 mm long; pilose; truncate, or obtuse. Floret callus hairs 1-2.5 mm long.
Fertile
Spikelets comprising 4-6 fertile florets; with diminished florets at the apex. Spikelets elliptic; laterally compressed; 10-14 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus evident; 0.4-0.7 mm long; pilose; truncate, or obtuse. Floret callus hairs 1-2.5 mm long.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 10-14 mm long; 1 length of upper glume; membranous; much thinner on margins; without keels; 3-7 -veined. Lower glume lateral veins obscure. Lower glume surface smooth, or asperulous; rough on veins. Lower glume apex acute, or acuminate. Upper glume lanceolate; 10-14 mm long; 1.6-2 length of adjacent fertile lemma; membranous; with hyaline margins; without keels; 3-7 -veined. Upper glume lateral veins obscure. Upper glume surface smooth, or asperulous; rough on veins. Upper glume apex acute, or acuminate.
Morphology Reproductive morphology Flowers Florets
Fertile lemma elliptic; 6-7.6 mm long; coriaceous; much thinner on margins; without keel; 7-9(-11) -veined. Lemma midvein ciliate. Lemma surface pilose; hairy below. Lemma margins ciliate. Lemma hairs 1-2.3 mm long. Lemma apex lobed; 2 -fid; with lobes 3-4.5 mm long; incised 0.5-0.6 of lemma length; awned; 3 -awned. Principal lemma awn from a sinus; geniculate; flat below; 5.5-7.5 mm long overall; with twisted column. Lateral lemma awns arising on apex of lobes; 0.5-2 mm long. Palea elliptic; 3.7-5 mm long; 2 -veined. Palea keels ciliolate. Apical sterile florets resembling fertile though underdeveloped.
Morphology Reproductive morphology Flowers
Lodicules 2; cuneate; 0.4-0.7 mm long; fleshy; ciliate. Anthers 3; 0.2-0.5 mm long; retained within floret.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; ellipsoid; 1.7-2.3 mm long; light brown. Embryo 0.5 length of caryopsis. Hilum elliptic; 0.33 length of caryopsis.
Morphology Reproductive morphology Flowers Cleistogene
Cleistogenes present; in lower sheaths; 1 -flowered; 4.5 mm long.
Distribution
South America: southern South America.
Reference
Arundineae. Sulecik 2005.
[GB]

Sources

  • Angiosperm Extinction Risk Predictions v1

    • Angiosperm Threat Predictions
    • http://creativecommons.org/licenses/by/4.0

  • GrassBase - The Online World Grass Flora

    • Clayton, W.D., Vorontsova, M.S., Harman, K.T. and Williamson, H. (2006 onwards). 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 2026. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 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 2026. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 International Plant Names Index and World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0