Poaceae
Olyra

Olyra davidseana Judz. & Zuloaga

First published in Syst. Bot. 17: 27 (1992)
This species is accepted
The native range of this species is Brazil (Amazonas, Pará). It is a herbaceous bamboo and grows primarily in the wet tropical biome.

Descriptions

Morphology General Habit
Perennial; caespitose. Culms 75 cm long; woody. Culm-internodes thin-walled; scaberulous. Culm-nodes purple; glabrous. Lateral branches sparse; arising from mid culm. Leaves cauline; 4-7 per branch. Leaf-sheaths glabrous on surface; outer margin hairy. Ligule a ciliate membrane. Leaf-blade base broadly rounded; symmetrical; with a brief petiole-like connection to sheath; petiole 0.2-0.4 cm long; petiole pubescent. Leaf-blades oblong, or ovate; 10-14 cm long; 30-40 mm wide. Leaf-blade venation parallel. Leaf-blade surface glabrous. Leaf-blade margins scabrous; ciliate; hairy at base. Leaf-blade apex acuminate.
Morphology Reproductive morphology Inflorescences
Monoecious; with male and female spikelets in the same inflorescence. Inflorescence a panicle. Panicle open; ovate; dense; 3-5 cm long; 1.5-2 cm wide. Primary panicle branches appressed; whorled at lower nodes; 1-1.5 cm long. Panicle branches angular; scabrous. Sexes segregated; on unisexual branches; with male below. Spikelets solitary. Fertile spikelets pedicelled. Male spikelets pedicelled. Pedicels (female) clavate; scabrous; glabrous.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets ovate; dorsally compressed; 13-16 mm long; breaking up at maturity; disarticulating below each fertile floret. Male spikelets distinct from female; 1 flowered; lanceolate; 6-8 mm long; glabrous. Male spikelet glumes absent. Male spikelet lemma 3 -veined.
Fertile
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets ovate; dorsally compressed; 13-16 mm long; breaking up at maturity; disarticulating below each fertile floret.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes deciduous; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume ovate; 13-16 mm long; 1 length of upper glume; membranous; without keels; 9 -veined. Lower glume surface scabrous; rough on veins. Lower glume apex attenuate. Upper glume ovate; 13-16 mm long; 2 length of adjacent fertile lemma; membranous; without keels; 7 -veined. Upper glume lateral veins with cross-veins. Upper glume surface scabrous; rough on veins. Upper glume apex acuminate.
Morphology Reproductive morphology Flowers Florets
Fertile florets female. Fertile lemma elliptic, or oblong; dorsally compressed; 6-7 mm long; 2.7-3 mm wide; indurate; pallid; shiny; without keel. Lemma surface smooth. Lemma margins involute; ciliate; hairy below. Lemma hairs 1-1.5 mm long. Lemma apex acute. Palea 1 length of lemma; indurate; without keels.
Morphology Reproductive morphology Flowers
Lodicules 3; elliptic; 1 mm long. Anthers 3; 2-3 mm long; purple. Stigmas 2.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp.
sex Male
Male spikelets distinct from female; 1 flowered; lanceolate; 6-8 mm long; glabrous. Male spikelet glumes absent. Male spikelet lemma 3 -veined.
Distribution
South America: Brazil.
Reference
Olyreae. Jud. & Zuol. 2001.
[GB]

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: threatened. Confidence: confident
[AERP]

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 2026. 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 2026. 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