Poaceae
Sporobolus

Sporobolus amaliae Veldkamp

First published in Blumea 35: 411 (1991)
This species is accepted
The native range of this species is Lesser Sunda Islands (Timor). It is an annual 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: confident
[AERP]

IUCN Red List of Threatened Species https://www.iucnredlist.org/species/177597967/177599390

Conservation
DD - data deficient
[IUCN]

Morphology General Habit
Annual; caespitose. Basal innovations intravaginal. Culms erect; 25-52 cm long. Culm-internodes smooth; distally glabrous. Leaf-sheaths smooth; glabrous on surface; outer margin hairy. Leaf-sheath oral hairs scanty, or lacking. Ligule a fringe of hairs, or absent; 0.05-0.15 mm long. Leaf-blades 5-9.5 cm long; 2-4.5 mm wide. Leaf-blade midrib keeled beneath. Leaf-blade surface scaberulous; rough adaxially; pubescent; sparsely hairy; hairy adaxially. Leaf-blade margins tuberculate-ciliate. Leaf-blade apex acuminate.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle open; lanceolate; effuse; 12 cm long; 4 cm wide. Primary panicle branches ascending; 13-20 -nate; whorled at most nodes; simple; 1.5-2.2 cm long; bearing 3-6 fertile spikelets on each lower branch. Panicle axis 10-13 noded. Panicle branches capillary. Spikelets solitary. Fertile spikelets pedicelled. Pedicels 0.5-0.75 mm long; smooth.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 1.5-1.75 mm long; breaking up at maturity; disarticulating below each fertile floret.
Fertile
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 1.5-1.75 mm long; breaking up at maturity; disarticulating below each fertile floret.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes deciduous; similar; reaching apex of florets. Lower glume lanceolate, or ovate; 1-1.45 mm long; 0.66-0.9 length of upper glume; hyaline; purple; without keels; 0-1 -veined. Lower glume lateral veins absent. Lower glume surface smooth. Lower glume apex acuminate. Upper glume oblong, or ovate; 1.5-1.75 mm long; 1 length of adjacent fertile lemma; hyaline; purple; without keels; 1 -veined. Upper glume lateral veins absent. Upper glume surface smooth. Upper glume apex acute.
Morphology Reproductive morphology Flowers Florets
Fertile lemma oblong, or ovate; 1.5-1.75 mm long; membranous; without keel; 1 -veined. Lemma apex obtuse. Palea readily splitting down midline; oblong; 1.4 mm long; 2 -veined. Palea keels approximate. Palea apex truncate, or obtuse.
Morphology Reproductive morphology Flowers
Lodicules 2; 0.25-0.3 mm long. Anthers 3; 0.3-0.5 mm long.
Morphology Reproductive morphology Fruits
Caryopsis with free soft pericarp; ellipsoid, or obovoid; isodiametric; quadrangular; 0.75-0.9 mm long. Embryo 0.5 length of caryopsis.
Distribution
Asia-tropical: Malesia.
Reference
Eragrostideae. Baaijens 1997.
[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

  • IUCN Categories

    • IUCN Red List of Threatened Species
    • 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