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| Pinanga schwanerensis A.Randi, Hikmat & Heatubun
in Randi, Hikmat & Heatubun, 2019.
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Abstract
A new species of palm, Pinanga schwanerensis, is described and illustrated here. This is the third species of Pinanga to have been described from Kalimantan since the description of P. salicifolia Blume and P. albescens Becc. A discussion of its morphological characters, distribution, ecology, habitat and conservation status is provided.
Keywords: Arecaceae, palms, Pinanga, Kalimantan, taxonomy
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| Figure 2. Pinanga schwanerensis. A. Clustering habit. B. Irregular divided leaf blade, upper surface. C. Undivided young leaf blade, below surface. D. Stem and crownshaft. E-F. Interfoliar inflorescence with persistent prophyll. G. Staminate flower. H-I. Mature fruit, epicarp and mesocarp. J. Endocarp and seed.
Scale bar : A = 60 cm; B-C = 10 cm; D = 30 cm; E = 3 cm; F = 5 cm;
G = 9 mm; H-J = 17 mm. All photos by A. Randi.
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Pinanga schwanerensis A.Randi, Hikmat & Heatubun, sp. nov.
Diagnosis:— This taxon is similar to Pinanga jambusana C.K.Lim in general habit and inflorescence appearance, but can be distinguished by a combination of the following characters: the leaf pinnate or divided irregularly into 2–3 leaflets each side, rarely entire, with petiole to 120 cm long, ligule present; inflorescence interfoliar, bursting out among marcescent leaf sheaths; prophyll leathery and persistent; stamens 15–18; fruits broadly ellipsoid, colored dull white with dark purple at the tip and turning dark purple entirely when mature.
Distribution:— Pinanga schwanerensis is known only from the Schwaner mountains, which include the Bukit
Baka Bukit Raya National Park at the border of West and Central Kalimantan of Indonesia. It has been recorded from
five localities so far, two localities from West and three from the Central Kalimantan (Figure 1).
Habitat:— Pinanga schwanerensis grows in primary lowland Dipterocarp forest, on undulating land and slopes at
an elevation of 150–550 m asl. It seems to prefer humid areas covered by dense forest canopy in narrow valleys and/or
at the side of small rivers between ridges, usually growing on soil with a thick litter layer.
Etymology:— From Schwaner Mountain in the border of West and Central Kalimantan, Indonesia.
Agusti Randi, Agus Hikmat and Charlie D. Heatubun. 2019. Pinanga schwanerensis, A New Species of Pinanga (Arecaceae) from Kalimantan, Indonesia. Phytotaxa. 402(2); 121–125. DOI: 10.11646/phytotaxa.402.2.6
