Arecaceae
Calamus

Calamus pogonotium W.J.Baker

First published in Phytotaxa 197(2): 151 (2015)
This species is accepted
The native range of this species is Borneo (Sarawak). It is a liana 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: threatened. Confidence: confident
[AERP]

General Description
Solitary, short-stemmed, erect rattan, rarely taller than 4 m; stem without sheaths to 10 mm diam., with sheaths to 20 mm diam., internodes 5-10 cm. Sheaths densely covered in fine long black spines to 3 cm, sometimes with straw-coloured tips, mostly in horizontal groups with joined bases, some spines much smaller, bristle-like, and abundant pale brown hairs, the sheaths ending in 2 long, slender, tapering, erect ear-like processes (auricles), one on each side of the petiole, to 20 cm long, 1 cm wide at the base (usually less), ± convex, armed with scattered and grouped spines, the inner surface unarmed. Leaf to 1.2 m, ecirrate; petiole to c. 30 cm, c. 0.5 cm wide at the base, armed with pale reflexed grapnel spines and scattered black spicules and abundant indumentum, later becoming minutely roughened; rachis neatly curved, armed as the petiole; leaflets up to c. 60 on each side of the rachis, very regularly arranged, c. 20 × 1 cm, each with a bunch of fine bristles at the base on the undersurface, and abundant soft bristles on both surfaces, the margins with long bristles interlocking with those of the next leaflet; young leaves tinged pink. Inflorescences small and inconspicuous, borne on the leaf sheaths, held erect between the auricles of the subtending leaf, rarely more than 16 cm long, closely adpressed to the sheaths; peduncle very short or absent, the entire inflorescence enclosed within the unarmed or bristly prophyll, splitting along its length to expose the flowers, other bracts very small. Mature fruit ± barrel-shaped, c. 17 × 14 mm, beaked, covered in 16-17 vertical rows of dull red-brown, thin, scarcely channelled scales. Seed 8 × 6 × 4 mm; sarcotesta sweet and juicy. Seedling leaf pinnate with c. 6 hairy leaflets on each side. (Fig. 72, Pls. 13A, 14C, 14D).
Distribution
A rather rare palm of ridges in the headwaters of the major rivers; elsewhere known from the Mulu National Park in Sarawak.
[PW]

Uses

Use
Not known.
[PW]

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/

  • Kew Backbone Distributions

    • The International Plant Names Index and World Checklist of Vascular Plants 2025. 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 2025. 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

  • Palmweb - Palms of the World Online

    • Palmweb 2011. Palmweb: Palms of the World Online. Published on the internet http://www.palmweb.org. Accessed on 21/04/2013
    • Content licensed under Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License http://creativecommons.org/licenses/by-nc-sa/3.0