Poaceae
Nassella

Nassella curamalalensis (Speg.) Barkworth

First published in Taxon 39: 609 (1990)
This species is accepted
The native range of this species is NE. Argentina to SW. Uruguay. It is a perennial and grows primarily in the subtropical biome.

Descriptions

Morphology General Habit
Perennial; caespitose. Culms erect; slender; 15-70 cm long. Culm-internodes distally glabrous. Leaf-sheaths glabrous on surface. Leaf-sheath oral hairs lacking. Ligule an eciliate membrane; 0.5-1 mm long; obtuse. Leaf-blades filiform; conduplicate; 15-20 cm long; 0.3-0.4 mm wide. Leaf-blade surface scaberulous. Leaf-blade apex acute; pungent.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle; terminal, or terminal and axillary. Panicle open; linear; equilateral; 5-10 cm long; bearing few spikelets. Spikelets solitary. Fertile spikelets pedicelled.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; 6-12 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus evident, or elongated; curved; 0.6-1.2 mm long; pubescent; obtuse.
Fertile
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; 6-12 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus evident, or elongated; curved; 0.6-1.2 mm long; pubescent; obtuse.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 6-12 mm long; 1 length of upper glume; hyaline; purple; without keels; 3 -veined. Lower glume surface scabrous; rough on veins. Lower glume apex setaceously attenuate. Upper glume lanceolate; 6-12 mm long; 2-2.5 length of adjacent fertile lemma; hyaline; purple; without keels; 3 -veined. Upper glume surface scabrous; rough on veins. Upper glume apex setaceously attenuate.
Morphology Reproductive morphology Flowers Florets
Fertile lemma linear; laterally compressed; gibbous; 3.5-5 mm long; chartaceous, or coriaceous; without keel; 5 -veined. Lemma surface papillose; glabrous. Lemma margins convolute; covering most of palea. Lemma apex awned; 1 -awned. Principal lemma awn eccentric; bigeniculate; 30-50 mm long overall; with 23-30 mm long limb; with twisted column. Column of lemma awn 10-15 mm long; glabrous. Palea 1-1.9 mm long; 0 -veined; without keels.
Morphology Reproductive morphology Flowers
Lodicules 2. Anthers 3; 2 mm long; anther tip penicillate. Stigmas 2. Ovary glabrous.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; fusiform. Hilum linear.
Distribution
South America: southern South America.
Reference
Stipeae. Torres 1994.
[GB]

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: not threatened. Confidence: confident
[AERP]

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 Names and Taxonomic Backbone

    • The International Plant Names Index and World Checklist of Vascular Plants 2024. 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

  • World Checklist of Vascular plants (WCVP)

    • The International Plant Names Index and World Checklist of Vascular Plants 2024. 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