Poaceae
Eragrostis

Eragrostis vallsiana Boechat & Longhi-Wagner

First published in Iheringia, Bot. 51: 179 (1998)
This species is accepted
The native range of this species is Brazil. It is an annual and grows primarily in the seasonally dry tropical biome.

Descriptions

Morphology General Habit
Annual; caespitose. Culms erect; 13.5-28 cm long; 2-5 -noded. Culm-internodes eglandular, or glandular (below nodes). Lateral branches ample. Leaves cauline. Leaf-sheaths mostly shorter than adjacent culm internode; eglandular, or glandular (on midvein); outer margin hairy. Ligule a fringe of hairs; 0.7-0.8 mm long. Leaf-blades 1-6 cm long; 1.5-3.2 mm wide; eglandular, or glandular (on midvein). Leaf-blade surface smooth; pilose; hairy on both sides. Leaf-blade apex acuminate.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle; terminal and axillary. Peduncle eglandular, or glandular (above). Panicle open; oblong; dense; 8-9.5 cm long; 2.5-5 cm wide. Primary panicle branches ascending; 1 -nate; 2-3 cm long; bearing spikelets almost to the base. Panicle axis smooth, or scaberulous, or tuberculate; with scattered hairs, or glabrous. Panicle branches glabrous in axils, or bearded in axils. Spikelets solitary. Fertile spikelets pedicelled. Pedicels glandular; smooth, or scaberulous.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 9-28 fertile florets; with diminished florets at the apex. Spikelets elliptic; laterally compressed; 3.9-9.5 mm long; 1-1.1 mm wide; breaking up at maturity; rhachilla persistent; retaining paleas. Rhachilla internodes obscured by lemmas.
Fertile
Spikelets comprising 9-28 fertile florets; with diminished florets at the apex. Spikelets elliptic; laterally compressed; 3.9-9.5 mm long; 1-1.1 mm wide; breaking up at maturity; rhachilla persistent; retaining paleas. Rhachilla internodes obscured by lemmas.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes deciduous; similar; shorter than spikelet. Lower glume lanceolate; 0.8-1.1 mm long; 1 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 ovate; 0.8-1.3 mm long; 0.5 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 florets appressed to rhachilla. Fertile lemma ovate; 1-1.2 mm long; 0.3-0.6 mm wide; membranous; keeled; 3 -veined. Lemma midvein scaberulous. Lemma lateral veins obscure. Lemma apex acute. Palea 0.8-1 mm long. Palea keels ciliolate; adorned above; with 0.66 of their length adorned. Apical sterile florets resembling fertile though underdeveloped.
Morphology Reproductive morphology Flowers
Lodicules 2; cuneate; fleshy. Anthers 2; 0.2 mm long; purple.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; ellipsoid; without sulcus; 0.4-0.6 mm long; light brown; reticulate; obtuse. Embryo 0.5 length of caryopsis.
Distribution
South America: Brazil.
Reference
Eragrostideae. Boechat & L-W 2003.
[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 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