REINWARDTIA 2019 18 (1) ISSN 0034 – 365 X | E-ISSN 2337 − 8824 | Accredited 10/E/KPT/2019 A JOURNAL ON TAXONOMIC BOTANY, PLANT SOCIOLOGY AND ECOLOGY REINWARDTIA A JOURNAL ON TAXONOMIC BOTANY, PLANT SOCIOLOGY AND ECOLOGY Vol. 18 (1): 1 – 50, June 28, 2019 Chief Editor Kartini Kramadibrata (Mycologist, Herbarium Bogoriense, Indonesia) Editors Dedy Darnaedi (Taxonomist, Herbarium Bogoriense, Indonesia) Tukirin Partomihardjo (Ecologist, Herbarium Bogoriense, Indonesia) Joeni Setijo Rahajoe (Ecologist, Herbarium Bogoriense, Indonesia) Marlina Ardiyani (Taxonomist, Herbarium Bogoriense, Indonesia) Himmah Rustiami (Taxonomist, Herbarium Bogoriense, Indonesia) Lulut Dwi Sulistyaningsih (Taxonomist, Herbarium Bogoriense, Indonesia) Eka Fatmawati Tihurua (Morphologist, Herbarium Bogoriense, Indonesia) Topik Hidayat (Taxonomist, Indonesia University of Education, Indonesia) Eizi Suzuki (Ecologist, Kagoshima University, Japan) Jun Wen (Taxonomist, Smithsonian Natural History Museum, USA) Barry J. Conn (Taxonomist, School of Life and Environmental Sciences, The University of Sydney, Australia) David G. Frodin (Taxonomist, Royal Botanic Gardens, Kew, United Kingdom) Graham Eagleton (Wagstaffe, NSW, Australia) Secretary Ruslan Bukhori Layout Liana Astuti Illustrators Wahyudi Santoso Anne Kusumawaty Correspondence on editorial matters and subscriptions for Reinwardtia should be addressed to: HERBARIUM BOGORIENSE, BOTANY DIVISION, RESEARCH CENTER FOR BIOLOGY– INDONESIAN INSTITUTE OF SCIENCES CIBINONG SCIENCE CENTER, JLN. RAYA JAKARTA – BOGOR KM 46, CIBINONG 16911, P.O. Box 25 CIBINONG INDONESIA PHONE (+62) 21 8765066; Fax (+62) 21 8765062 E-MAIL: reinwardtia@mail.lipi.go.id http://e-journal.biologi.lipi.go.id/index.php/reinwardtia Cover images: Begonia mattampensis Ardi & D.C.Thomas spec. nov. (§ Petermannia). Top left: Habit. Top right: Stipules. Below left: Male inflorescence. Middle: Male flower & female flower. Below right: Fruit & ovary cross section (middle part). Photos: W.H. Ardi. http://blog.sivitas.lipi.go.id/ekaf001/ The Editors would like to thank all reviewers of volume 18(1): Eizi Suzuki, Kagoshima University, Japan Mark Hughes, Royal Botanic Garden Edinburgh, United Kingdom Frédéric Danet, Jardin botanique de la Ville de Lyon, France Barry J. Conn, School of Life and Environmental Sciences, The University of Sydney, Australia Michele Rodda, Singapore Botanic Gardens, Singapore Mark Newman, Royal Botanic Garden Edinburgh, United Kingdom REINWARDTIA Vol. 18. No. 1. pp: 27‒30 DOI: 10.14203/reinwardtia.v18i1.3700 27 RHODODENDRON WIDJAJAE (ERICACEAE, SECTION SCHISTANTHE) A NEW SPECIES FROM SULAWESI Received September 26, 2018; accepted March 12, 2019 GEORGE ARGENT† Royal Botanic Garden Edinburgh, 20A Inverleith Row, Edinburgh EH35LR, Scotland, United Kingdom. Email: g.argent@rbge.org.uk YASPER MICHAEL MAMBRASAR Herbarium Bogoriense, Botany Division, Research Center for Biology-LIPI, Cibinong Science Center, Jln. Raya Jakarta-Bogor Km. 46, Cibinong 16911, Bogor, Indonesia. Email: michael_mambrasar@yahoo.com ABSTRACT ARGENT, G. & MAMBRASAR, Y. M. 2019. Rhododendron widjajae (Ericaceae, section Schistanthe) a new species from Sulawesi. Reinwardtia 18(1): 27‒30. — A new species of Rhododendron section Schistanthe (= subgenus Vireya) is described, Rhododendron widjajae Argent & Mambrasar. It is compared with the two most similar species and the differences demonstrated. Key words: Er icaceae, Indonesia, Mt. Mekongga, new species, Rhododendron, Sulawesi. ABSTRAK ARGENT, G. & MAMBRASAR, Y. M. 2019. Rhododendron widjajae (Ericaceae, seksi Schistanthe) satu jenis baru dari Sulawesi. Reinwardtia 18(1): 27‒30. — Satu jenis baru Rhododendron seksi Schistanthe (= submarga V ireya), dipertelakan sebagai Rhododendron widjajae Argent & Mambrasar. Jenis baru ini dibandingkan dengan dua jenis yang hampir mirip dan dijelaskan perbedaannya. Kata Kunci: Er icaceae, Gunung Mekongga, Indonesia, jenis bar u, R hododendron, Sulawesi. INTRODUCTION Of the three subgenera known from the Malesian region: Hymenanthes (Blume) K.Koch, (without scales); Tsutsutsi (G.Don) Pojarkpva (with multicellular lamina hairs) and V ireya Clarke, the present new species clearly belongs in subgenus V ireya with its multicellular, stellate, (not laminar) scales. Rhododendrons of subgenus Vireya is a very large subgenus of 324 described species (Sleumer, 1966; Argent, 2015; James & Argent, 2017) and many more are to be expected from the still poorly botanically explored regions of Indonesia. Sulawesi with 28 species (29 including the present one) is the third richest island after New Guinea to the east with 171 (121 in the Indonesian part) and Borneo in the west with 56 species. Rhododendron widjajae Ar gent & Mambrasar, spec. nov. ─ Type: Indonesia, Sulawesi, S.E. Sulawesi, North Kolaka Regency, Rante Angin Subdistrict, near Tinukari Village. 03°39´51.8"S, 121°14´12.3"E, 2,658 m asl, 26 November 2010, Widjaja et al. 9370 (Holotype: BO!). Fig. 1 & 2. Diagnosis. Similar to Rhododendron pseudobuxi- folium Sleumer in its size of flower. It differs in having twigs which are without the short hairs of that species; in having pedicels without simple hairs and the corolla is sparsely scaley outside not glabrous and glabrous inside, not shortly hairy. Superficially similar to R. celebicum (Blume) DC. but smaller and significantly differing from that species by the hairy filaments and ovary. Shrub. Twigs laxly scaly, from a smooth surface, the scales flattened with a broad ribbed flange, without simple hairs. Leaves in tight pseudowhorls 5‒7 together; blade elliptic to sub-elliptic-obovate, 20‒25 × 6‒8 mm, apex broadly pointed, sometimes apiculate; margin weakly crenulate, with impressed scales in the pits of the crenulations distally, strongly revolute proximally, more narrowly and less strongly so distally; base tapering and shortly decurrent into the petiole. Scales adaxially laxly distributed and extremely caducous leaving a glabrescent surface; abaxially laxly distributed, somewhat impressed in small depressions, sub-circular to weakly stellately lobed, the centres small, with a broad distinctly ribbed flange; mid-vein narrowly impressed above in the proximal half of the leaf, then level with the blade surface, broadly raised beneath proximally but tapering rapidly and slender distally; lateral veins not visible. Petiole 2‒6 × ca. 1 mm, flattened, grooved above, laxly scaly. Flower buds http://dx.doi.org/10.14203/reinwardtia.v18i1.3700 REINWARDTIA 28 [VOL.18 Fig. 1. Rhododendron widjajae Argent & Mambrasar, spec.nov. A. Branch showing habit of flowers. B. Flower. C. Corolla opened out. D. Stamen. E. Pistil. From Widjaja et al. 9370 (BO), drawn by Wahyudi Santoso (BO). ARGENT & MAMBRASAR: Rhododendron widjajae, a new species from Sulawesi 2019] 29 not seen unopened. Bracts: the outer narrowly ovate with sharply acute apices, minutely hairy outside and with densely overlapping scales along the margins and in the distal half abaxially. Inner bracts and bracteoles not seen. Flowers solitary or three together, hanging. Pedicels 14 × 0.5 mm, laxly scaley, more densely scaly at the distal 1 mm, without simple hairs. Calyx a low disk, densely scaly outside. Corolla 35 × 30 mm, orange; tube 25 × 4 × 8 mm, straight, laxly scaly outside, glabrous inside; lobes 5, spreading, 18 × 8 mm, subspathulate. Stamens 10 to 25 mm long, Fig. 2. Rhododendron widjajae Argent & Mambrasar, spec.nov. Photograph of the living plant from type location. Photos: Elizabeth A. Widjaja. A B REINWARDTIA 30 [VOL.18 clustered on the upper side of the mouth of the corolla; filaments 24 mm, laxly hairy with irregularly spreading hairs in the proximal half, glabrous distally, linear but slightly broader towards the base; anthers 2 × 1 mm oblongoid, without tails, smooth. Disc glabrous except densely white-hairy on a narrow upper margin. Ovary 5 × 2 mm, densely covered with white, appressed distally pointing hairs which obscure the small scales except at the distal end; style subdensely hairy with irregularly pointing hairs in the proximal half, glabrous distally; stigma ca. 1.25 mm diameter, placed on the upper side of the mouth. Fruit not seen. Distribution. Presently only known from the type locality. Habitat and ecology. Mt. Mekongga is a volcanic peak rising to 2,779 m in the north-west part of South East Sulawesi. This new species was collected in the sub-alpine area at 2,658 m asl. which is close to the summit (2,779 m). This area is described as: jagged limestone karst and the Rhododendron was probably an epiphyte. The associated species have not been recorded but will no doubt have been semi-open dwarf shrubs. Conservation status. Data Deficient. The habitat of Rhododendron widjajae is on the sub alpine area. Mt. Mekongga recently has been designated as protected forest by Indonesia Ministry of Environment and Forestry. But the status of Mt. Mekongga not include to conservation area like Nature conservation or National Park (Kartonegoro, 2014). The damage habitat is likely to be caused more by fire than from lightning. Etymology. Named in honour of Prof. Elizabeth A. Widjaja, former senior researcher at the Herbarium Bogoriense and joint collector of this species for her contribution to Indonesian botany. Notes. Rhododendron widjajae was collected on the ‘Mekonga expedition’ as Rhododendron species ‘2’. There appear to be no duplicates. This species keys to R. pseudobuxifolium in Argent 2015, but have some different characters. The ridged flanges to the leaf scales are another significant feature of this species. ACKNOWLEDGEMENTS Collected on the Mekonga expedition which was a collaboration between the University of California, Davis and LIPI, Department of Forestry-ITB under the agreement number IU01TW008160. We are grateful to Prof. Elizabeth A. Widjaja for helpful comments regarding the collection of this species. We also thank to Wahyudi Santoso for preparing the illustration. The first author would like to acknowledge funding from Sibbald Trust for the visit to the Herbarium Bogoriense where this species was studied. REFERENCES ARGENT, G. 2015. Rhododendrons of Subgenus Vireya 2 nd Ed. Royal Botanic Garden Edinburgh. JAMES, S. & ARGENT, G. 2017. Rhododendron stanleyi S.James & Argent. A new Rhododendron species (Ericaceae subgenus Vireya) from Papua New Guinea. Edinburgh Journal of Botany 74 (2): 163–168. KARTONEGORO, A. 2014. The Gesneriaceae of Sulawesi VI: The Species from Mekonga Mts. with a new species of Cyrtandra described. Reinwardtia 14 (1): 1–11. SLEUMER, H. (1966). Rhododendron. In: VAN STEENIS, C. G. G. J. (Ed.). Flora Malesiana I (6): 474–668. (Wolters-Noordhoff: Groningen). INSTRUCTION TO AUTHORS Scope. R einwardtia is a scientific r egular jour nal on plant taxonomy, plant ecology and ethnobotany published in June and December. Manuscript intended for a publication should be written in English. Titles. Titles should be br ief, infor mative and followed by author ’s name and mailing address in one- paragraphed. Abstract. English abstr act followed by Indonesian abstr act of not mor e than 250 wor ds. Keywor ds should be given below each abstract. Manuscript. Manuscr ipt is or iginal paper and r epr esent an ar ticle which has not been published in any other journal or proceedings. The manuscript of no more than 36 pages by using Times New Roman 11, MS Word for Windows of A4 with double spacing, submitted to the editor through . New paragraph should be indented in by 5 characters. For the style of presentation, authors should follow the latest issue of Reinwardtia very closely. Author(s) should send the preferred running title of the article submitted. Every manuscript will be sent to two blind reviewers. Identification key. Taxonomic identification key should be pr epar ed using the aligned couplet type. Nomenclature. Str ict adher ence to the Inter national Code of Nomenclatur e is obser ved, so that taxonomic and nomenclatural novelties should be clearly shown. English description for new taxon proposed should be provided and the herbaria where the type specimens area deposited should be presented. Name of taxon in taxonomic treatment should be presented in the long form that is name of taxon, author’s name, year of publication, abbreviated journal or book title, volume, number and page. Map/line drawing illustration/photograph. Map, line dr awing illustr ation, or photogr aph pr efer ably should be prepared in landscape presentation to occupy two columns. Illustration must be submitted as original art accompanying, but separated from the manuscript. The illustration should be saved in JPG or GIF format at least 350 pixels. Legends or illustration must be submitted separately at the end of the manuscript. References. Bibliogr aphy, list of liter atur e cited or r efer ences follow the Har var d system as the following examples. Journal : KRAENZLIN, F. 1913. Cyrtandraceae novae Philippinenses I. Philipp. J. Sci. 8: 163–179. MAYER, V., MOLLER, M., PERRET, M. & WEBER, A. 2003. Phylogenetic position and generic differentiation of Epithemateae (Gesneriaceae) inferred from plastid DNA sequence data. A merican J. Bot. 90: 321–329. Proceedings : TEMU, S. T. 1995. Peranan tumbuhan dan ternak dalam upacara adat “Djoka Dju” pada suku Lio, Ende, Flores, Nusa Tenggara Timur. In: NASUTION, E. (Ed.). Prosiding Seminar dan Lokakarya Nasional Etnobotani II. LIPI & Perpustakaan Nasional. Pp. 263–268. (In Indonesian). SIMBOLON, H. & MIRMANTO, E. 2000. Checklist of plant species in the peat swamp forests of Central Kalimantan, Indonesia. In: IWAKUMA, T., INOUE, T., KOHYAMA, T., OSAKI, M., SIMBOLON, H., TACHIBANA, H., TAKAHASHI, H., TANAKA, N., YABE, K. (Eds.). Proceedings of the International Symposium on: Tropical Peatlands. Pp. 179 ‒ 190. Book : RIDLEY, H. N. 1923. Flora of the Malay Peninsula 2. L. Reeve & Co. Ltd, London. Part of Book : BENTHAM, G. 1876. Gesneriaceae. In: BENTHAM, G. & HOOKER, J. D. (Eds.). Genera Plantarum 2. Lovell Reeve & Co., London. Pp. 990–1025. Thesis : BAIRD, L. 2002. A Grammar of Kéo: An Austronesian Language of East Nusantara. Australian National University, Canberra. [PhD. Thesis] . Website : http://www.nationaalherbarium.nl/fmcollectors/k/KostermansAJGH.html. (Accessed 15 February 2012). http://www.nationaalherbarium.nl/fmcollectors/k/KostermansAJGH.htm REINWARDTIA Author Agreement Form Title of article : Name of Author(s) : I/We hereby declare that:  My/Our manuscript was based on my/our original work.  It was not published or submitted to other journal for publication.  I/we agree to publish my/our manuscript and the copyright of this article is owned by Reinwardtia.  We have obtained written permission from copyright owners for any excerpts from copyrighted works that are included and have credited the sources in our article. Author signature (s) Date ___________________________________________________________________________________________ Name Reinwardtia Published by Herbarium Bogoriense, Botany Division, Research Center for Biology, Indonesian Institute of Sciences Address: Jln. Raya Jakarta-Bogor Km. 46 Cibinong 16911, P.O. Box 25 Cibinong Telp. (+ 62) 21 8765066; Fax (+62) 21 8765062 Email: reinwardtia@mail.lipi.go.id REINWARDTIA Vol. 18. No. 1. 2019 CONTENTS NUR MUHAMMAD HERIYANTO, ISMAYADI SAMSOEDIN & KUSWATA KARTAWINATA. Tree species diversity, structural characteristics and carbon stock in a one-hectare plot of the protection forest area in West Lampung Regency, Indonesia …….……………………………………………………..….……………………………...……... 1 WISNU H. ARDI & DANIEL C. THOMAS. A new species of Begonia (Begoniaceae) from South Sulawesi, Indonesia, and an augmented description of Begonia bonthainensis ……...………………..………….…...………... 19 GEORGE ARGENT & YASPER MICHAEL MAMBRASAR. Rhododendron widjajae (Ericaceae, section Schistanthe) a new species from Sulawesi …………..……………………………………………………….…………………...... 27 MARLINA ARDIYANI & AXEL DALBERG POULSEN. An update of the genus Etlingera (Zingiberaceae) in Sulawesi including the description of a new species ….………………………………………………….…….……… 31 SRI RAHAYU & INGGIT PUJI ASTUTI. Hoya decipulae (Apocynaceae, A sclepiadoideae), a new species from Sumatra …………………………………………………………………………………………………...……….……. 43 Reinwardtia is a accredited Journal (10/E/KPT/2019) http://e-journal.biologi.lipi.go.id/index.php/reinwardtia Herbarium Bogoriense Botany Division Research Center for Biology – Indonesian Institute of Sciences Cibinong Science Center Jln. Raya Jakarta − Bogor, Km 46 Cibinong 16911, P.O. Box 25 Cibinong Indonesia 0. front cover, cover dalam, reviewer Reinwardtia 18(1) 3-G Argent & M Mambrasar (27-30) 0. Daftar Isi Reinwardtia 18(1)