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

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Distribution

Map uses TDWG level 3 distributions (https://github.com/tdwg/wgsrpd)
Borneo present (World Checklist of Arecaceae)B
In Brunei widespread in Belait district. Elsewhere known only from 4th Division, Sarawak and parts of Sabah. (Dransfield, J. 1997: The Rattans of Brunei Darussalam)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. (Dransfield, J. 1997: The Rattans of Brunei Darussalam)A

Etymology

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

Common Name

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

Uses

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

Materials Examined

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

Bibliography

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