REINWARDTIA_13_1_101209 + dftar isi+new RE IN W AR DT IA 13 (1) A JOURNAL ON TAXONOMIC BOTANY, PLANT SOCIOLOGY AND ECOLOGY RE IN W AR DT IA 13 (1) A JOURNAL ON TAXONOMIC BOTANY, PLANT SOCIOLOGY AND ECOLOGY REINWARDTIA Vol 13, Part 1, pp: 13 − 14 13 NEW SPECIES OF PANDANUS (PANDANACEAE) FROM KABAENA ISLAND, SOUTH EAST SULAWESI, INDONESIA Received February 26, 2009; accepted June 16, 2009 ARY PRIHARDHYANTO KEIM Herbarium Bogoriense, Research Centre for Biology LIPI. Jl. Raya Jakarta Bogor Km 46, Bogor 16911, Indonesia. E-mail: arypkeim@yahoo.com ABSTRACT KEIM, A. P. 2009. New species of Pandanus (Pandanaceae) from Kabaena Island, South East Sulawesi, Indonesia. Reinwardtia 13(1): 13–14. ⎯ Pandanus kabaenaensis A.P. Keim is described as a new species from Kabaena Island in the Province of South East Sulawesi, Indonesia. Keywords: Austrokeura, Kabaena, Pandanus, Pandanaceae, Sulawesi. ABSTRAK KEIM, A. P. 2009. Jenis baru Pandanus (Pandanaceae) dari P. Kabaena, Sulawesi Tenggara, Indonesia. Reinwardtia 13(1): 13–14. ⎯ Pandanus kabaenaensis A.P. Keim dari Pulau Kabaena, Sulawesi Tenggara, Indonesia dipertelakan sebagai jenis baru. Kata kunci: Austrokeura, Kabaena, Pandanus, Pandanaceae, Sulawesi. INTRODUCTION Kabaena Island (5.25° S, 121.94° E) is in the Bone Bay of South East Sulawesi Province, Indone- sia.The island has an area of 873 km² and rises to 1560 m at its highest point. Despite previous botani- cal explorations made in Kabaena by Beccari in 1874, Weber van Bosse in 1899, Elbert in 1909, de Boer in ca. 1922 (van Steenis, 1950), Herbarium Bogoriense (BO) and Harvard University Herbaria in 1993 (Ismail, 2005 pers. comm.), and BO in 2006 (Rugayah, 2006), the pandan flora of the island re- mains largely unknown. This paper describes a new species, Pandanus kabaenaensis, from herbarium specimens collected by the most recent expeditions to the island. Pandanus kabaenaensis A.P.Keim spec. nov. ⎯ Figs. 1. Pandan mediocris; infructescentia terminalis, soli- taria; cephalium globosum; phalanges a profundus sul- cus separatus; phalange 4 – 6 drupa constans; stigmata aspicientia extrinsecus. ⎯ Typus: Indonesia, South East Sulawesi, Kabaena Island, Gunung Katopi, 18 km north- west of Tangkeno, 05° 12’ S 121° 25’ E, 7 Aug. 1993, Mc Donald & Ismail 4183 (Holotypus–BO; Isotypus–A). Medium size tree pandan, 5 m tall. Stem hard, slender, 2.5–3 cm diameter, leaf scars crowded, dis- tance between leaf scars ca. 0.5 cm. Leaves in a ro- sette, spirally arranged in three ranks (tristichous); leaf–blade lanceolate–elongate, ca. 90 cm long, ca. 2 cm wide; leafsheath short, clasping, ca. 1.5 cm long; margin spinose, spines hard, sharp; lamina surfaces bifacially glabrous; adaxial surface green, adaxial ventral pleats absent; abaxial surface pale green, main nerve more apparent, with spines, re- curved spines obvious; acuminate apex, acumen ca. 30 cm long. Infructescence terminal, solitary, ca. 20 cm long; peduncle ca. 5 × 2 cm. Cephalium glo- bose, ca. 8 × 5.5–7.0 cm. Phalanges ca. 30, sepa- rated by deep furrows, each 3.0 × 1.7 cm. Drupes 4 –6, oblong to slightly oblanceolate, ca. 3.0 × 1.4– 1.5 cm, crowded; style short, 0.1–0.3 cm long, weakly ascending; stigmas facing outwards (extrorse). Field characters. Common short tree, 5 m tall, branching sparingly above and below, stems more than 4 cm diameter; inflorescence 20 cm long, sec- ondary staminate branches cylindrical, 5 cm long, 2 cm diameter; branches elliptical of equal size; fruit immature, subrotundate, ca. 7 cm diameter. Distribution. Known only from type locality. Habitat & ecology. Occurring in open savannah on serpentine soil, at 250 to 500 m altitude. Etymology. Named after the type locality. REINWARDTIA 14 [VOL.13 sembles an immature form of P. odoratissimus L. f. However, unlike the latter species, most of the pha- langes in P. kabaenaensis are separated by deep furrows, such that each phalange can be easily sepa- rated in the manner characteristic of section Aus- trokeura Stone (1974). The outwardly–facing stig- mas of the new species are also opposite to the in- trorsely–turned stigmas of P. odoratissimus. Within section Austrokeura, Pandanus kabaenaensis is most similar to P. brassii Martelli of New Guinea. The phalanges in the latter species are also sepa- rated by deep furrows, but the cephalia are much larger (40×35 cm; see Martelli, 1929). The number of drupes (6–10) in a phalange are also more nu- merous than for P. kabaenaensis. The section Aus- trokeura was previously known only from the sa- vannahs of New Guinea and northern Australia. The discovery of a new representative from Sulawesi supports the possibility of a strong floristic link be- tween Sulawesi and the eastern parts of Malesia (see Lam, 1945a; b). ACKNOWLEDGEMENTS I am grateful to Drs. Rugayah and Laode Alhamd (BO) for information on Kabaena Island. My deepest gratitude also extended to Mr. Ismail (BO) for valuable information on the type collection and habitat where the new pandan was collected. Prof. N. Fukuoka (JICA) and Dr. Wayne Takeuchi (A) made some preliminary sugges- tions on the manuscript. REFERENCES LAM, H.J. 1945a. Contributions to our knowledge of the flora of Celebes (collections of C. Monod de Froidville) and of some other Malaysian islands. Blumea 5 (3): 554−599. LAM, H.J. 1945b. Notes on the historical phytogeogra- phy of Celebes. Blumea 5 (3): 600–640. MARTELLI, U. 1929. The Pandanaceae collected for the Arnold Arboretum by L.J. Brass in New Guinea. J. Arnold Arb. 10: 137–142. RUGAYAH, T. 2006. Keanekaragaman & pengungka- pan potensi flora pulau Kabaena Sulawesi Tenggara. Herbarium Bogoriense, Cibinong. [Mimeograph]. STONE, B.C. 1974. Towards an improved infrageneric classification in Pandanus (Pandanaceae). Bot. Jahrb. Syst. 94: 459−540. VAN STEENIS, C.G.G.J. 1950. Flora Malesiana. Vol. 1. Ser. 1: Spermatophyta. Noordhoff−Kolff, Jakarta. Fig. 1. Pandanus kabaenaensis A.P. Keim (A. Lanceo- late−longate leaf, B. Leaf margin with obvious spines, C. Medium−sized habit and slender stem, D. Solitary cephal- ium, half part of cephalium consists of phalanges sepa- rated each other by deep furrows, E. A phalange with 5 drupes with outwardly–facing stigmas, which is a distinc- tive character for the section Astrokeura). Drawn from the holotype (Mc Donald & Ismail 4183, BO!) by Wahyudi Santoso. Conservation status. Although the species is com- mon on Kabaena Island, it has not been reported elsewhere and can thus be regarded as vulnerable (VU). Notes. Based on the structure of the cephalium, this species is undoubtedly a member of subgenus Pan- danus (see infrageneric classification in Stone, 1974). 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