Arecaceae
Hydriastele

Hydriastele manusii (Essig) W.J.Baker & Loo

First published in Kew Bull. 59: 65 (2004)
This species is accepted
The native range of this species is Bismarck Archipelago (Manus Island). It is a tree and grows primarily in the wet tropical biome.

Descriptions

Baker, W.J., Barfod, A.S., Cámara-Leret, R., Dowe, J.L., Heatubun, C.D., Petoe, P., Turner, J.H., Zona, S. & Dransfield, J. (2024) Palms of New Guinea. Royal Botanic Gardens, Kew, Richmond. 726 pp.

Morphology General Habit
Moderately robust, single-stemmed palm to 20 m, bearing 9–13 leaves in crown
Morphology Stem
Stem 10–15 cm diam. Leaf ca. 1.5–2 m long including petiole, arching; sheath ca. 100 cm long, with white bloom, crownshaft ca. 150 × 15 cm; petiole ca. 10 cm long, upper surface channelled; leaflets ca. 40 each side of rachis, regularly arranged, ascending and drooping at their tips, linear; apical leaflets comprising 2–4 folds, truncately jagged at the tip
Morphology Reproductive morphology Inflorescences
Inflorescence 60–80 cm long including 20–22 cm peduncle, branched to 2 orders, protandrous; rachillae 12–15; triads decussately arranged
Morphology Reproductive morphology Flowers
Female flower with free sepals and free petals with conspicuous, triangular tips Male flower with 6 stamens
Morphology Reproductive morphology Fruits
Fruit ca. 12 × 4 mm (when dry), elongate and curved (at least when dry), red
Morphology Reproductive morphology Seeds
Seed ca. 8.3 × 3.5 mm (when dry), curved; endosperm homogeneous.
Distribution
Mount Dremsel, Manus Island.
Ecology
Premontane rainforest on steep slopes at 600–750 m.
Vernacular
None recorded.
Conservation
Data Deficient (IUCN 2019). This species is known from only one site, where there is limited information on ongoing threats. Due to insufficient evidence, an extinction risk category cannot be selected.
Note
Hydriastele manusii is endemic to Manus Island. It is a moderately robust canopy palm distinguished by its short, arching leaves and inflorescences with very long (20–22 cm) peduncles. The species is unlikely to be confused with other palms.
[PONG]

IUCN Red List of Threatened Species https://www.iucnredlist.org/species/151357216/151358630

Conservation
DD - data deficient
[IUCN]

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]

Uses

Use
None recorded
[PONG]

Sources

  • Angiosperm Extinction Risk Predictions v1

    • Angiosperm Threat Predictions
    • http://creativecommons.org/licenses/by/4.0

  • 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/

  • IUCN Categories

    • IUCN Red List of Threatened Species
    • http://creativecommons.org/licenses/by-nc-sa/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

  • Kew Science Photographs

    • Copyright applied to individual images

  • Palms of New Guinea

    • http://creativecommons.org/licenses/by-nc-sa/3.0