Calamus rhytidomus Becc., Ann. Roy. Bot. Gard. (Calcutta) 11(App.): 7 (1913)

Primary tabs

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Distribution

Map uses TDWG level 3 distributions (http://www.nhm.ac.uk/hosted_sites/tdwg/geogrphy.html)
Borneo present (World Checklist of Arecaceae)B
A local rattan of eastern Kalimantan. (Dransfield J. and Patel M. 2005. Rattans of Borneo, an interactive key. Royal Botanic Gardens Kew.)A

Conservation

  • Data deficient. (Dransfield J. and Patel M. 2005. Rattans of Borneo, an interactive key. Royal Botanic Gardens Kew.)A

Description

  • Habit - Climbing; stems clustering; not branching in the forest canopy; not dying after flowering. Plants dioecious.
    Leaf-sheath - Tubular for most of its length; stem and sheath together 1.71-2.09 cm; flagellum long; knee present; with spines similar to the rest of the sheath. Sheath surface with small horizontal ridges; without hairs or minute spines; green; scales on surface lacking. Leaf sheath with sparse spines; spines persistent; upward pointing; of more or less the same size; the larger spines tapered; the longest, excluding those at the mouth of the sheath less than 1cm. Spines straight; in life black; with smooth margins; the bases swollen; yellow when fresh. Spines mostly grouped; where grouped together arranged in partial whorls or combs. Spines around the leaf sheath mouth scarcely different from those on the rest of the sheath. Ocrea - Present; not diverging at an angle from the stem; tattering; unarmed. Leaf-stalk - Absent or usually less than 3cm. Leaves - Ecirrate; rachis armed; not hairy. Undersurface of newly emerged leaflets same as upper surface. Scales absent from leaflet surfaces. Leaflets sessile; 1 to 10 on each side of rachis; regularly spaced and parallel; held in a single plane; lanceolate; the leaflet tip acute. Longest leaflet 30.6-37.4 cm; more than 5cm wide; with none or very few brsitles; the margins with no or very few bristles, or bristles at tip only. Short, dark or dark-tipped up to 5mm long. Leaflets conspicuously plicate; the veins not radiating; midrib raised and prominent adaxially. Lowermost leaflets not reflexed across the stem. Apical leaflets joined to 1/2; not less than 4 cm long.
    Inflorescence - Inflorescence axis erect along the axis, with clawed spines on the primary bracts; not rooting at its tip; much longer than the leaves; the first bract not enclosing the inflorescences at anthesis. Partial inflorescence present; bracts at the base of the partial inflorescences wholly tubular with a neat mouth or a small open limb, much shorter than the partial inflorescence. Rachilla lacking an enclosing bract; not at all pressed against the subtending bract. Flowers arranged in two rows. Male rachillae not less than 1 cm long. Female rachillae not congested; without conspicuously stalked flower cups. Bracts on the rachillae not net-like.
    Fruit - At maturity 1.1-1.5 cm; globose; red resin (Dragon's blood) absent; one seeded. Calyx in fruit split part way and partly tubular. Fruit scales with a conspicuous central groove; the tips not recurved; colour on ripe fruit brown ( including mid, matt, dark brown etc); when dry mid brown (excluding dark margins). Seed hemispherical; the surface pitted; endosperm homogeneous. (Dransfield J. and Patel M. 2005. Rattans of Borneo, an interactive key. Royal Botanic Gardens Kew.)A

Notes

  • Distinctive in its ecirrate leaf with rather broad leaflets and sheaths with neat horizontal ridges. (Dransfield J. and Patel M. 2005. Rattans of Borneo, an interactive key. Royal Botanic Gardens Kew.)A

Bibliography

    A. Dransfield J. and Patel M. 2005. Rattans of Borneo, an interactive key. Royal Botanic Gardens Kew.
    B. World Checklist of Arecaceae