Poaceae
Aulonemia

Aulonemia effusa (Hack.) McClure

First published in Smithsonian Contr. Bot. 9: 56 (1973)
This species is accepted
The native range of this species is E. Brazil. It is a bamboo 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. Rhizomes short; pachymorph. Culms 150 cm long; 5 mm diam.; woody. Culm-internodes terete; thin-walled. Culm-nodes without obvious supra-nodal ridge. Lateral branches suffrutescent. Bud complement 1. Branch complement one; solitary. Culm-sheaths deciduous; setose on shoulders. Ligule an eciliate membrane; 0.5-1 mm long. Leaf-blade base with a brief petiole-like connection to sheath; petiole 0.4 cm long. Leaf-blades lanceolate; 10-15 cm long; 20-25 mm wide; mid-green and glaucous; discolorous with last colour beneath. Leaf-blade venation without cross veins. Leaf-blade surface glabrous. Leaf-blade apex attenuate.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle open; globose; effuse; 40 cm long. Primary panicle branches 1 -nate; 20-30 cm long. Panicle branches smooth. Spikelets solitary. Fertile spikelets pedicelled.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 basal sterile florets; 8 fertile florets; with diminished florets at the apex. Spikelets linear; subterete; 20-30 mm long; 3 mm wide; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes eventually visible between lemmas; scaberulous.
Fertile
Spikelets comprising 1 basal sterile florets; 8 fertile florets; with diminished florets at the apex. Spikelets linear; subterete; 20-30 mm long; 3 mm wide; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes eventually visible between lemmas; scaberulous.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; shorter than spikelet; thinner than fertile lemma. Lower glume lanceolate; 3 mm long; 0.5 length of upper glume; membranous; without keels; 1 -veined. Lower glume lateral veins absent. Lower glume apex obtuse. Upper glume lanceolate; 6 mm long; 0.75 length of adjacent fertile lemma; membranous; without keels; 3 -veined. Upper glume apex obtuse.
Morphology Reproductive morphology Flowers Florets
Basal sterile florets barren; without significant palea; persisting on inflorescence. Lemma of lower sterile floret similar to fertile lemma; lanceolate; 6 mm long; 5 -veined; obtuse; mucronate. Fertile lemma elliptic; 7-8 mm long; chartaceous; without keel; 5-7 -veined. Lemma surface scaberulous. Lemma apex acute; mucronate. Palea 1 length of lemma. Palea keels scabrous. Apical sterile florets resembling fertile though underdeveloped.
Morphology Reproductive morphology Flowers
Lodicules 3; 1.5 mm long; ciliate. Anthers 3; 3 mm long. Stigmas 2.
Distribution
South America: Brazil.
Reference
Bambuseae. Hackel 1997.
[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

    • 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

  • Kew Science Photographs

    • Copyright applied to individual images

  • Neotropikey

    • Milliken, W., Klitgard, B. and Baracat, A. (2009 onwards), Neotropikey - Interactive key and information resources for flowering plants of the Neotropics.
    • http://creativecommons.org/licenses/by/3.0