Poaceae
Eragrostis

Eragrostis seminuda Trin.

First published in Mém. Acad. Imp. Sci. St.-Pétersbourg, Sér. 6, Sci. Math. 1: 406 (1830)
This species is accepted
The native range of this species is Brazil to NE. Argentina. It is a perennial and grows primarily in the seasonally dry tropical 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: not threatened. Confidence: confident
[AERP]

Morphology General Habit
Perennial; caespitose. Basal innovations extravaginal. Culms erect; 15-50 cm long; 1-2 -noded. Leaf-sheaths 2-15 cm long; hirsute. Ligule a fringe of hairs; 0.1-0.3 mm long. Leaf-blades flat, or involute; 5-20 cm long; 1-3 mm wide. Leaf-blade surface hirsute; hairy on both sides. Leaf-blade apex attenuate.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle open; ovate, or obovate; 10-30 cm long. Primary panicle branches spreading; whorled at lower nodes; 10-16 cm long. Panicle axis scabrous; with scattered hairs, or glabrous. Panicle branches bearded in axils. Spikelets solitary. Fertile spikelets pedicelled. Pedicels scabrous.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 3-4 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 1.7-3.8 mm long; 1.2-1.7 mm wide; breaking up at maturity; rhachilla deciduous; disarticulating below each fertile floret. Rhachilla internodes pilose; hairy at tip.
Fertile
Spikelets comprising 3-4 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 1.7-3.8 mm long; 1.2-1.7 mm wide; breaking up at maturity; rhachilla deciduous; disarticulating below each fertile floret. Rhachilla internodes pilose; hairy at tip.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes deciduous; similar; shorter than spikelet. Lower glume lanceolate; 1.1-1.5 mm long; 0.66 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 1.7-2.2 mm long; 0.9 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume primary vein scabrous. Upper glume lateral veins absent. Upper glume apex acute.
Morphology Reproductive morphology Flowers Florets
Fertile lemma ovate; 2-2.5 mm long; membranous; mid-green, or grey; keeled; 3 -veined. Lemma lateral veins obscure. Lemma margins ciliate; hairy in the middle. Lemma hairs 0.5-1 mm long. Lemma apex acuminate. Palea keels scabrous; adorned below. Apical sterile florets resembling fertile though underdeveloped.
Morphology Reproductive morphology Flowers
Lodicules 2; cuneate; fleshy. Anthers 3; 0.3-0.5 mm long.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; ovoid; sulcate on hilar side; 0.5-1 mm long; dark brown; reticulate.
Distribution
South America: Brazil and southern South America.
Reference
Eragrostideae. Boech & Valls 1995.
[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

  • Herbarium Catalogue Specimens

    • 'The Herbarium Catalogue, Royal Botanic Gardens, Kew. Published on the Internet http://www.kew.org/herbcat [accessed on Day Month Year]'. Please enter the date on which you consulted the system.
    • 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 2025. 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 2025. 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