Poaceae
Axonopus

Axonopus longispicus (Döll) Kuhlm.

First published in Relat. Commiss. Linhas Telegr. Estratég. Matto Grosso Amazonas 5(11): 87 (1922)
This species is accepted
The native range of this species is N. South America to Brazil. It is a perennial and grows primarily in the seasonally dry tropical biome.

Descriptions

Morphology General Habit
Perennial; caespitose. Culms 30-60 cm long; 1-3 -noded. Culm-nodes glabrous. Leaf-sheaths 3-10 cm long; wider than blade at the collar. Ligule a ciliolate membrane; 0.3-0.7 mm long. Leaf-blades spreading; 10-20 cm long; 4-10 mm wide. Leaf-blade midrib conspicuous. Leaf-blade surface pubescent; sparsely hairy. Leaf-blade apex obtuse, or abruptly acute.
Morphology Reproductive morphology Inflorescences
Inflorescence composed of racemes; with 1-4 peduncles per sheath. Peduncle 25 cm long. Racemes 2-3; paired, or digitate; erect, or ascending; unilateral; 5-15 cm long. Central inflorescence axis 0-3 cm long. Rhachis angular; 0.3 mm wide; glabrous on surface; scabrous on margins; glabrous on margins. Spikelet packing adaxial; 4.5-6 spikelets per cm. Raceme-bases brief; pubescent. Spikelets appressed; solitary. Fertile spikelets pedicelled. Pedicels 0.2-0.3 mm long.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong; dorsally compressed; obtuse, or subacute; 3-3.9 mm long; 0.7 mm wide; falling entire.
Fertile
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong; dorsally compressed; obtuse, or subacute; 3-3.9 mm long; 0.7 mm wide; falling entire.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes one the lower absent or obscure; reaching apex of florets; thinner than fertile lemma. Upper glume 1 length of spikelet; membranous; 5 -veined. Upper glume lateral veins obscure. Upper glume surface pubescent.
Morphology Reproductive morphology Flowers Florets
Basal sterile florets barren; without significant palea. Lemma of lower sterile floret similar to upper glume; 2 length of fertile lemma; 1 length of spikelet; 5 -veined; obscurely veined; pubescent. Fertile lemma 1.6-2 mm long; indurate; light brown; without keel. Lemma margins involute. Lemma apex pubescent. Palea involute; indurate.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp.
Distribution
South America: western South America, northern South America, and Brazil.
Reference
Paniceae. Black 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

  • 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 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

  • 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