Areca klingkangensis J.Dransf., Kew Bull. 39: 15 (1984)

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Distribution

Map uses TDWG level 3 distributions (http://www.nhm.ac.uk/hosted_sites/tdwg/geogrphy.html)
Borneopresent (World Checklist of Arecaceae)B
Borneo, Sarawak, 1st Division, known only from the type collection. (J. Dransfield, The genus Areca (Palmae: Arecoideae) in Borneo. 1984)A

Discussion

  • This species has smaller inflorescences and fruit than A. abdulrahmanii and A. andersonii, and may easily be distinguished by the pres- ence of 9 rather than 6 or c. 16 stamens. With these two species it forms a rather distinctive group within section Microareca. (J. Dransfield, The genus Areca (Palmae: Arecoideae) in Borneo. 1984)A

Diagnosis

  • inter species maiores sectionis Microarecae propter florem staminatum stipitatum A. abdulrahmanii et A. ander- sonii affinis sed staminibus 9 vice c. 16 vel 6 distincta. (J. Dransfield, The genus Areca (Palmae: Arecoideae) in Borneo. 1984)A

Biology And Ecology

  • I discovered this species growing in very wet mossy forest developed on an eroded sandstone block summit at c. 700 m altitude; for an account of its discovery see Dransfield (1982). (J. Dransfield, The genus Areca (Palmae: Arecoideae) in Borneo. 1984)A

Etymology

  • A. klingkangensis is named after the Klingkang Range, of which G. Gaharu is one of the higher summits, the range which separates Sarawak from Kalimantan Barat. (J. Dransfield, The genus Areca (Palmae: Arecoideae) in Borneo. 1984)A

Description

  • Erect, solitary, undergrowth palmlet. Stem to 2 m tall, c. 7-10 mm diam.; internodes green, 2.5-6 cm long, bearing scattered dull brown scales; nodal scars c. 3 mm wide. Crownshaft well-defined, pale green drying dull brown- ish, c. 25 x 1.5 cm, only slightly swollen; leafsheaths neatly abscissing, c. 10 cm long, longitudinally striate, bearing scattered dark brown scales; ligule c. 3 mm long, soon tattering and becoming lost. Leaf pinnate, excluding sheath to c. 55 cm, including petiole to 12 x 0.3 cm; leaflets 3-6 on each side of the rachis, distant, stiff, very coriaceous, narrow, 1-3-ribbed, concolorous, drying mid-brown, 22-40 x 0.7-1.7 cm, the longest near the base, the shor- test at the apex, acuminate except for the apical pair where tip minutely lobed; minute brown scales present on both surfaces, more abundant abaxially. Inflorescence infrafoliar, branching to 1 order, short, not exceeding c. 8 cm long, usually shorter; prophyll winged, c. 8 x 2 cm or less, bearing scattered scales; peduncle very short, c. 15 mm long, 5 mm wide just above the winged base; rachillae divergent, usually 3 only, to c. 6 cm long, c. 4 mm diam. at the base, tapering to the tip, bright reddish tinged, bearing abun- dant persistent low blackish scales, and sparse, caducous, chaffy hairs; triads rarely more than 2-3 at the base of each rachilla, the rachillae otherwise bearing spirally arranged paired or solitary staminate flowers. Staminate flower irregularly angled, markedly stipitate, especially those of the triads; stipitate base of calyx 0.5-2.5 x 1 mm, angled, glabrous, calyx lobes low c. 0.7 x 1 mm triangular, the margins smooth; petals valvate, glabrous broadly triangular, c. 2.5-3.5 X 1-1.5 mm; stamens 9, slightly irregular, borne on very short or obsolete filaments, anthers 1.8-2 x 0.5-0.6 mm, latrorse; pistillode lacking. Pistillate flower sessile; sepals 3, free c. 5.5 x 3.5 mm, imbricate, cucullate, sparsely hairy along the strong keel, minutely ciliate along margins; petals 3, imbricate, ovate, c. 4.5 x 5 mm, ciliate; staminodes 6, minute; ovary ± conical in bud, c. 2.5 mm diam. at base, tipped with 3 fleshy, angled stigmas. Young fruit greenish tinged; mature fruit known only in mummified condition, fusiform, 26 x 5 mm. (J. Dransfield, The genus Areca (Palmae: Arecoideae) in Borneo. 1984)A

Bibliography

A. J. Dransfield, The genus Areca (Palmae: Arecoideae) in Borneo. 1984
B. World Checklist of Arecaceae