Axonopus eminens (Nees) G.A.Black

First published in Advancing Frontiers Pl. Sci. 5: 92 (1963)
This species is accepted
The native range of this species is S. Tropical America. It is a perennial and grows primarily in the seasonally dry tropical biome.

Descriptions

Morphology General Habit
Perennial. Rhizomes absent, or short. Butt sheaths withering, or persistent and investing base of culm; with fibrous dead sheaths. Culms robust; 100-200 cm long; 3-8 -noded. Culm-nodes glabrous, or pubescent, or bearded. Leaves cauline. Leaf-sheaths 15-40 cm long; without keel. Leaf-sheath oral hairs ciliate. Ligule a ciliolate membrane; 0.4-0.5 mm long. Leaf-blade base tapering to the midrib. Leaf-blades conduplicate; 10-100 cm long; 4-15 mm wide. Leaf-blade midrib conspicuous. Leaf-blade surface glabrous. Leaf-blade apex acuminate; hardened.
Morphology Reproductive morphology Inflorescences
Inflorescence composed of racemes; with 1 peduncles per sheath. Peduncle 40-70 cm long. Racemes numerous; 20-50; borne along a central axis; ascending; unilateral; 9-12 cm long. Central inflorescence axis 10-30 cm long. Rhachis angular; 0.3-0.4 mm wide; glabrous on surface; scabrous on margins; glabrous on margins. Spikelet packing adaxial; 5-9 spikelets per cm. Raceme-bases brief. Spikelets appressed; solitary. Fertile spikelets sessile.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets ovate; dorsally compressed; subacute; 1.7-2.1 mm long; 0.5-0.8 mm wide; falling entire.
Fertile
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets ovate; dorsally compressed; subacute; 1.7-2.1 mm long; 0.5-0.8 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 ribbed. 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; 1-1.1 length of fertile lemma; 1 length of spikelet; 5 -veined; ribbed; glabrous, or puberulous; hairy between veins. Fertile lemma linear; 1.7-2 mm long; indurate; pallid, or yellow; without keel. Lemma margins involute. Lemma apex acute; without ornament. Palea involute; indurate.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp.
Distribution
South America: northern South America, western South America, and Brazil.
Reference
Paniceae. Black 1994.
[GB]

Sources

  • 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

    • 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