Poaceae
Eragrostis

Eragrostis petrensis Renvoize & Longhi-Wagner

First published in Kew Bull. 41: 71 (1986)
This species is accepted
The native range of this species is Brazil (Bahia, Minas Gerais, Rio de Janeiro). 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: threatened. Confidence: low confidence
[AERP]

Morphology General Habit
Perennial; caespitose. Butt sheaths coriaceous; yellow; glossy. Culms erect; 40-80 cm long. Leaf-sheath oral hairs ciliate. Ligule a fringe of hairs. Leaf-blades involute; 10-35 cm long; 2-2.5 mm wide; stiff. Leaf-blade surface glabrous to pilose; densely hairy.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle open; pyramidal; interrupted; 11-28 cm long. Primary panicle branches whorled at most nodes; bearing spikelets almost to the base. Panicle axis glabrous to pilose. Panicle branches bearded in axils. Spikelets solitary. Fertile spikelets sessile.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 4-9 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 3-6 mm long; 1-2 mm wide; breaking up at maturity; disarticulating below each fertile floret.
Fertile
Spikelets comprising 4-9 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 3-6 mm long; 1-2 mm wide; breaking up at maturity; disarticulating below each fertile floret.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes similar; shorter than spikelet. Lower glume ovate; 1.5-2.3 mm long; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex acute. Upper glume ovate; 1.5-2.3 mm long; 0.75-0.9 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume lateral veins absent. Upper glume apex acute.
Morphology Reproductive morphology Flowers Florets
Fertile lemma ovate; 1.8-2.5 mm long; membranous; purple; suffused with last colour; keeled; 3 -veined. Lemma lateral veins distinct. Lemma surface scaberulous. Lemma apex acute. Palea 1.8-2 mm long; 2 -veined. Palea keels ciliolate. Apical sterile florets resembling fertile though underdeveloped.
Morphology Reproductive morphology Flowers
Lodicules 2; cuneate; fleshy. Anthers 3; 0.7-0.8 mm long; yellow, or purple.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; oblong; 0.8 mm long.
Distribution
South America: Brazil.
Reference
Eragrostideae. Renvoize 1996.
[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

  • Neotropikey

    • Milliken, W., Klitgard, B. and Baracat, A. (2009 onwards), Neotropikey - Interactive key and information resources for flowering plants of the Neotropics.
    • http://creativecommons.org/licenses/by/3.0