Daemonorops ruptilis var. acaulescens J.Dransf., Bot. J. Linn. Soc. 81: 23 (1980)

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
In Brunei widespread in Belait district. Elsewhere known only from 4th Division, Sarawak and parts of Sabah. (J. Dransfield, The Rattans of Brunei Darussalam. 1997)A

Discussion

  • The fruit and habit of this variety are consistently different from those of the type variety. D. ruptilis var. acaulescens is a plant of ridges in lowland dipterocarp forest at altitudes up to c. 350 m above sea level. (J. Dransfield, The Rattans of Brunei Darussalam. 1997)A

Common Name

  • Wi Tulang (Ib.) (J. Dransfield, The Rattans of Brunei Darussalam. 1997)A

Etymology

  • Stemless (J. Dransfield, The Rattans of Brunei Darussalam. 1997)A

Uses

  • None known. (J. Dransfield, The Rattans of Brunei Darussalam. 1997)A

Description

  • Stemless clustering rattan with short decumbent subterranean stem to c. 40 mm diam. without sheaths, with sheaths to 60 mm diam., internodes very short. Leaf ecirrate, to 3.5 m long including the petiole and sheath; sheath to 40 cm long, without knee, armed with oblique whorls of flattened pale brown spines to 30 × 4 mm, and densely armed with reddish-brown indumentum; petiole to 1 m, armed with scattered or partially whorled spines to 4 cm; leaflets c. 40 on each side of the rachis, regularly arranged, to 60 × 3 cm, ± unarmed except for a few marginal bristles and a few bristles on the lower surface of the mid vein. Inflorescences up to c. 1 m long, with up to 5 partial inflorescences, the male with crowded rachillae, the female with lax ± divaricating rachillae; peduncle to 60 cm or more; primary bracts dull brown, quickly falling; secondary and tertiary bracts all conspicuous, persistent, irregularly splitting; male rachillae to 8 cm, bearing crowded, strictly distichous flowers; female rachillae to 15 cm with rather more distant flowers. Mature fruit rounded to short cylindrical, to 14 × 12 mm, tipped by a beak to 5 × 2 mm, and covered with 15 vertical rows of pale brown scales. Seed 11 × 7 mm; endosperm deeply ruminate. Seedling leaf not known. (Fig. 30). (J. Dransfield, The Rattans of Brunei Darussalam. 1997)A

Materials Examined

  • BEL: Labi, Bt.Telingan, Dransfield J. 6829; Sungai Liang, Andulau F.R, Wong 494. (J. Dransfield, The Rattans of Brunei Darussalam. 1997)A

Bibliography

    A. J. Dransfield, The Rattans of Brunei Darussalam. 1997
    B. World Checklist of Arecaceae