Poaceae
Axonopus

Axonopus surinamensis (Hochst. ex Steud.) Henrard

First published in Blumea 5: 275 (1942)
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 wet 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; clumped densely. Basal innovations subterete, or flabellate. Culms robust; 100-200 cm long; 3-5 mm diam.; 1-3 -noded. Culm-internodes elliptical in section. Culm-nodes glabrous, or pubescent. Lateral branches lacking. Leaves basal and cauline. Leaf-sheaths 15-50 cm long; keeled; hirsute. Ligule a ciliolate membrane; 0.3-0.4 mm long. Leaf-blades 10-40 cm long; 2-15 mm wide. Leaf-blade surface glabrous, or pilose. Leaf-blade apex obtuse.
Morphology Reproductive morphology Inflorescences
Inflorescence composed of racemes; terminal, or terminal and axillary; with 1-3 peduncles per sheath. Peduncle 35-100 cm long. Racemes 8-10; digitate; ascending, or drooping; unilateral; 12-20 cm long. Central inflorescence axis 2-10 cm long. Rhachis angular; 0.4-0.5 mm wide; drab; glabrous on surface; scaberulous on margins; glabrous on margins. Spikelet packing adaxial; 5-6.5 spikelets per cm. Raceme-bases brief; pubescent. Spikelets appressed; solitary. Fertile spikelets sessile.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong; dorsally compressed; subacute; 3-3.2 mm long; 0.7-0.8 mm wide; falling entire.
Fertile
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong; dorsally compressed; subacute; 3-3.2 mm long; 0.7-0.8 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 prominent. Upper glume surface glabrous, or puberulous; hairy between veins.
Morphology Reproductive morphology Flowers Florets
Basal sterile florets barren; without significant palea. Lemma of lower sterile floret similar to upper glume; 1.3-1.4 length of fertile lemma; 1 length of spikelet; 5 -veined; glabrous, or puberulous; hairy between veins. Fertile lemma 2.1-2.7 mm long; indurate; yellow; without keel. Lemma margins involute. Lemma apex obtuse; pubescent. Palea involute; indurate.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp.
Distribution
South America: northern South America and Brazil.
Reference
Paniceae. Black 1994.
[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 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