Axonopus comatus (Mez) Swallen

First published in Fieldiana, Bot. 28: 21 (1951)
This species is accepted
The native range of this species is S. Venezuela, Brazil (Rio de Janeiro). It is a perennial and grows primarily in the wet tropical biome.

Descriptions

Morphology General Habit
Perennial. Culms 50-100 cm long; 1-3 -noded. Culm-nodes pubescent. Leaf-sheaths hirsute. Ligule a ciliolate membrane. Leaf-blades 20-40 cm long; 6 mm wide; stiff. Leaf-blade surface hirsute. Leaf-blade apex obtuse.
Morphology Reproductive morphology Inflorescences
Inflorescence composed of racemes; with 1-2 peduncles per sheath. Racemes 17; digitate; ascending; unilateral; 10-15 cm long. Rhachis angular; 0.5 mm wide; drab; glabrous on surface; scabrous on margins; glabrous on margins. Spikelet packing adaxial; 4.5 spikelets per cm. Spikelets appressed; solitary. Fertile spikelets pedicelled. Pedicels oblong; 0.6-1 mm long; ciliate.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets ovate; dorsally compressed; subacute, or acute; 3.5-3.7 mm long; 1.2-1.4 mm wide; falling entire.
Fertile
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets ovate; dorsally compressed; subacute, or acute; 3.5-3.7 mm long; 1.2-1.4 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; 9 -veined. Upper glume surface pubescent; hairy at apex and 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 length of fertile lemma; 1 length of spikelet; 9 -veined; pubescent; hairy at apex; hairy also on veins. Fertile lemma 1.5-2 mm long; indurate; pallid, or yellow; without keel. Lemma margins involute. Lemma apex pubescent. Palea involute; indurate.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp.
Distribution
South America: Brazil.
Reference
Paniceae. Black 1994.
[GB]

Morphology General Habit
Perennial. Basal innovations flabellate. Culms robust; 70-200 cm long. Culm-nodes bearded. Leaves without demarcation between sheath and blade. Leaf-sheaths hirsute. Ligule a ciliolate membrane; 0.3 mm long. Leaf-blades conduplicate; 10-17 cm long; 6-10 mm wide; stiff. Leaf-blade surface hirsute.
Morphology Reproductive morphology Inflorescences
Inflorescence composed of racemes; with 2 peduncles per sheath. Racemes 4-6; digitate; ascending, or spreading; unilateral; 7-16 cm long. Central inflorescence axis 2-5 cm long. Rhachis angular; 0.4 mm wide; glabrous on surface; scabrous on margins; ciliate on margins. Rhachis hairs 1-2 mm long. Spikelet packing adaxial; 4.5 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; 3.5-4 mm long; 1-1.2 mm wide; falling entire.
Fertile
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong; dorsally compressed; subacute; 3.5-4 mm long; 1-1.2 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; 5-7 -veined. 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; 1.2 length of fertile lemma; 1 length of spikelet; 5-7 -veined; glabrous, or puberulous; hairy between veins. Fertile lemma 3 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.
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