Axonopus siccus (Nees) 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 Bolivia to Brazil and N. Argentina. It is a perennial and grows primarily in the seasonally dry tropical biome.

Morphology General Habit
Perennial; caespitose. Culms slender; 50-90 cm long; 1-4 -noded. Culm-internodes terete. Leaf-sheaths without keel. Ligule a ciliate membrane; 0.2-0.3 mm long. Leaf-blades erect; curved; conduplicate, or involute; 5-40 cm long; 2-7 mm wide; stiff. Leaf-blade surface glabrous.
Morphology Reproductive morphology Inflorescences
Inflorescence composed of racemes; with 1-2 peduncles per sheath. Peduncle 25-50 cm long. Racemes 4-30; borne along a central axis; ascending, or spreading; unilateral; 5-15 cm long. Central inflorescence axis 3-15 cm long. Rhachis angular; 0.3-0.4 mm wide; glabrous on surface; scabrous on margins; glabrous on margins. Spikelet packing adaxial; 6-10 spikelets per cm. Raceme-bases brief; glabrous, or pubescent. Spikelets appressed; solitary. Fertile spikelets pedicelled. Pedicels 0.2-0.4 mm long.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong, or ovate; dorsally compressed; obtuse, or subacute; 1.6-2.1 mm long; 0.6-0.7 mm wide; falling entire.
Fertile
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong, or ovate; dorsally compressed; obtuse, or subacute; 1.6-2.1 mm long; 0.6-0.7 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 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 length of fertile lemma; 1 length of spikelet; 5 -veined; ribbed; glabrous, or puberulous; hairy between veins. Fertile lemma 1.6-2.1 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: western South America, Brazil, and southern South America.
Reference
Paniceae. Black 1994.
[GB]

Morphology General Habit
Perennial. Butt sheaths persistent and investing base of culm; with curly dead sheaths. Culms robust; 200 cm long; 2-7 -noded. Culm-nodes pubescent. Leaf-sheaths 10-60 cm long; without keel; hirsute. Leaf-sheath oral hairs lacking, or ciliate. Ligule a ciliolate membrane; 0.3-1 mm long. Leaf-blades conduplicate; 10-75 cm long; 3-5 mm wide. Leaf-blade surface hirsute; densely hairy.
Morphology Reproductive morphology Inflorescences
Inflorescence composed of racemes; with 1-2 peduncles per sheath. Peduncle 30-75 cm long. Racemes numerous; 25-50; borne along a central axis; ascending; unilateral; 9-18 cm long. Central inflorescence axis 7-18 cm long. Rhachis angular; 0.3-0.5 mm wide; drab, or dark-coloured (purple); glabrous on surface; scabrous on margins; glabrous on margins. Spikelet packing adaxial; 5-9 spikelets per cm. Raceme-bases brief; pubescent. Spikelets appressed; solitary. Fertile spikelets pedicelled. Pedicels 0.2-0.5 mm long.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic, or ovate; dorsally compressed; obtuse; 1.5-2.5 mm long; 0.5-0.8 mm wide; falling entire.
Fertile
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic, or ovate; dorsally compressed; obtuse; 1.5-2.5 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 surface pubescent; hairy between veins.
Morphology Reproductive morphology Flowers Florets
Basal sterile florets barren; without significant palea. Lemma of lower sterile floret similar to upper glume; 1-1.2 length of fertile lemma; 1 length of spikelet; 5 -veined; pubescent; hairy between veins. Fertile lemma 1.5-2 mm long; indurate; pallid, or yellow; without keel. Lemma margins involute. Lemma apex acute; 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. Rhizomes elongated. Culms erect; robust; 100-150 cm long; 2-3 -noded. Culm-internodes elliptical in section. Culm-nodes glabrous, or pubescent. Leaves without demarcation between sheath and blade. Leaf-sheaths 10-40 cm long; outer margin glabrous, or hairy. Ligule a ciliolate membrane; 0.3-0.4 mm long. Leaf-blades conduplicate; 15-40 cm long; 6-8 mm wide; stiff. Leaf-blade surface smooth. Leaf-blade apex acuminate.
Morphology Reproductive morphology Inflorescences
Inflorescence composed of racemes; with 1-2 peduncles per sheath. Peduncle 20-50 cm long. Racemes 15-20; borne along a central axis; ascending; unilateral; 5-25 cm long; simple, or with branchlets at base of longer racemes. Central inflorescence axis 10-15 cm long. Rhachis angular; 0.3-0.4 mm wide; drab, or dark-coloured (purple); glabrous on surface; scabrous on margins; glabrous on margins, or ciliate on margins. Rhachis hairs 0.3-0.8 mm long. Spikelet packing adaxial; 3.5-6 spikelets per cm. Spikelets appressed; solitary. Fertile spikelets pedicelled. Pedicels reduced to a stump; 0.3-0.5 mm long.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic, or ovate; dorsally compressed; obtuse, or subacute; 1.7-2.3 mm long; 0.6-0.8 mm wide; falling entire.
Fertile
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic, or ovate; dorsally compressed; obtuse, or subacute; 1.7-2.3 mm long; 0.6-0.8 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; purple; 4-5 -veined. Upper glume primary vein absent, or obscure. Upper glume surface 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 length of fertile lemma; 1 length of spikelet; purple; 4-5 -veined; with obscure midvein; puberulous; hairy between veins. Fertile lemma 1.7-2.3 mm long; indurate; 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: 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