A JOURNAL ON TAXONOMIC BOTANY, PLANT SOCIOLOGY AND ECOLOGY REINWARDTIA A JOURNAL ON TAXONOMIC BOTANY, PLANT SOCIOLOGY AND ECOLOGY Vol. 13(3): 221 —315, April 11, 2012 Chief Editor KARTINI KRAMADIBRATA Editors DEDYDARNAEDI (INDONESIA) TUKTRIN PARTOMIHARDJO (INDONESIA) JOENI SETIJO RAHAJOE (INDONESIA) TEGUHTRIONO (INDONESIA) MARLINAARDIYANI (INDONESIA) EIZI SUZUKI (JAPAN) JUN WEN (UNITED STATE OF AMERICA) Managing editor HIMMAH RUSTIAMI Secretary ENDANG TRI UTAMI Lay out DEDEN SUMIRATHIDAYAT Illustrators SUBARI WAHYUDI SANTOSO ANNE KUSUMAWAIY Reviewers BRYAN SIMON (AUSTRALIA), EVE J. LUCAS (UNITED KINGDOM), J.F.VELDKAMP (NETHERLANDS), LAUR- ENCE SKOG (USA), PIETER BAAS (NETHERLANDS), RUTH KIEW (MALAYSIA), ROBERT J. SORENG (USA), HE- LENA DUISTERMAAT (NETHERLANDS), LYN A. CRAVEN (AUSTRALIA), RUGAYAH (INDONESIA), MARK HUGHES (UNITED KINGDOM), MARTIN CALLMANDER (USA), PETER C. VAN WELZEN (NETHERLANDS), WAYNE TAKEUCHI (USA), NOBUYUKI FUKUOKA (JAPAN). Correspondence on editorial matters and subscriptions for Reinwardtia should be addressed to: HERBARIUM BOGORIENSE, BOTANY DIVISION, RESEARCH CENTER FOR BIOLOGY-LIPI, CIBINONG 16911, INDONESIA E-mail: [email protected] REINWARDTIA Vol 13, No 3, pp: 229 − 233 TWO NEW SPECIES OF BEGONIA (BEGONIACEAE) FROM BUKIT TIGA- PULUH NATIONAL PARK, RIAU, SUMATRA Received September 16, 2010; accepted June 14, 2011 DEDEN GIRMANSYAH Herbarium Bogoriense, Botany Division, Research Center for Biology-LIPI, Cibinong Science Center, Jl. Raya Bogor−Jakarta Km. 46, Cibinong 16911, Bogor, Indonesia. Email: [email protected] ABSTRACT GIRMANSYAH, D. 2012. Two new species of Begonia (Begoniaceae) from Bukit Tigapuluh National Park, Sumatra, Indonesia. Reinwardtia 13(3): 229–233. Two new species of Begonia (Begoniaceae) from Bukit Tigapuluh National Park, Sumatra, Indonesia are described. Those are Begonia triginticollium Girm. belongs to Begonia section Bracteibegonia and Begonia dolichocarpa Girm. belongs to Begonia section Petermannia. Key words: Begonia, Bukit Tigapuluh, Sumatra. ABSTRAK GIRMANSYAH, D. 2012. Dua jenis baru Begonia (Begoniaceae) dari Taman Nasional Bukit Tigapuluh, Sumatera, Indonesia. Reinwardtia 13(3): 229–233. Telah dipertelakan dua jenis baru Begonia (Begoniaceae) dari Taman Nasional Bukit Tigapuluh, Sumatera, Indonesia. Kedua jenis tersebut adalah Begonia triginticollium Girm. termasuk ke dalam seksi Bracteibegonia dan Begonia dolichocarpa Girm. termasuk ke dalam seksi Petermannia. Kata kunci: Begonia, Bukit Tigapuluh, Sumatera. INTRODUCTION Bukit Tigapuluh National Park, 31-07-2006, Deden 800 (holo BO). The species-rich genus Begonia is widely distributed in the tropical and subtropical regions of Creeping herb 5–10 cm tall. Stem repent with up- the world; currently 19 sections and approximately right portions, rooting at the nodes, reddish brown, 521 species of Begonia are recognized from South- succulent, unbranched, slender, densely covered by east Asia (Doorenbos et al., 1998; Hughes, 2008). red hair, internodes 2–3 cm apart; without a tuber. The extensive montane forests of Sumatra harbour Stipule greenish, with scattered hair on the veins, 52 known species representing 7 sections of the not keeled, ovate to narrowly triangular, 5–8 × 3–4 genus (Tebbitt, 2005; Hughes, 2008; Hughes et al., mm, margin fringed with glandular hairs, tip 2009) with many taxa still to be described (Sands, pointed, persistent. Leaves distant; petiole reddish 2001). Most of the montane forest habitat suitable brown, hairy, 1–3 cm long; lamina slightly oblique, for Begonia in Sumatra is found at the Barisan 3.5–8 × 1.5-3.5 cm, dark green above, yellowish mountain range which forms the spine of the island, green beneath with red hairs along veins, base running behind the southeastern coast. There is also rounded on the broader side, acute on the other side, an isolated complex of rather steep ridges and margin sparsely minutely toothed, tip acute; valleys in the otherwise quite flat Jambi province, venation palmate pinnate, 1 pair of veins at the base reaching up to 830 m above sea level, known as and 2–3 alternate veins along the midrib. Inflorescences terminal, monochasial cyme, Bukit Tigapuluh (‗Thirty Hills‘). This area has been declared as National Park and is of vital p e d uncles brownish green, hairy, erect, shorter than conservation importance regarding the large the leaves; few flowered, male flowers 1–2, female mammals of Sumatra, such as tiger, elephant and flowers 2, protogynous. Bracts in pairs, sparsely orangutan (Widyatmoko & Zich, 1998). The two hairy, margin fringed with short glandular hairs, plant species we described here are endemic to this pale green, oblong, 11–12 × 4–6 mm, persistent. park, thus highlighted its conservation importance Male flowers with a white pedicel 1–1.2 cm long; in botanical terms. tepals 3, white with a pink margin toward the tip, glabrous, margin slightly serrate with thinly teeth Begonia triginticollium Girm., sp. nov. – Fig.1 each tipped by hair, tip rounded, outer two A Begonia verecunda tepalorum marginibus serratis, rotundate, 1.2–1.3 × 1.1 cm, inner one narrowly floribus masculis 3- (non 4-) tepalis et petiolis elliptic, 0.9 × 0.4 cm; androecium an obovoid longioribus differt. – Typus: Sumatra, Riau Province, cluster, ca. 4 mm across; stamens ca. 28; filaments 229 230 REIN WARD TIA [VOL.13 0.2 cm c 1 cm b 3 cm a 0.2 cm e f 0.02 cm 0.5 cm 0.25 cm h 1 cm d g Fig. 1. Begonia triginticollium Girm. a. Habit; b. Male flower; c. Stamens; d. Female flower; e. Style; f. Fruit; g. Fruit in cross-section; h. Seeds. (Based on type specimen, Deden 800). Drawn by Wahyudi Santoso (BO). 2012] GIRM ANSY AH: T wo new specie s of Be gonia ( Begon iaceae) from S umatra , Indon esia 231 free, 1–2 mm; anthers golden yellow, narrowly internodes in the erect stem 2–15 cm apart, without obovate, ca. 1 mm long, tip slightly notched, a tuber. Stipules reddish green, ovate to narrowly opening by slits as long as the length of the anther, triangular, glabrous, ca. 1.4 × 0.3 cm, tip pointed, on one face of the anther. Female flowers with a caducous. Leaves distant; petiole reddish brown to reddish pedicel ca. 3 mm long; ovary reddish green, dark red, 1–2 cm long; lamina elliptic to oblong, hairy, 1.3–0.7 × 0.5–0.9 cm, wings 3, equal, ca. 3 dark green above, pale green to dark red beneath, mm wide, locules 3, placentas 2 per locule; tepals 5, base rounded on the broader side, acute on the other white with pink along the margin, with hairs, side, margin sparsely minutely toothed, apex margin serrate toward the tip, tip pointed, outermost acuminate, 5–11 × 11–15 cm; venation palmate 10–9 × 4–5 mm, innermost narrowly elliptic, pinnate, 1 pair of veins at the base and 2–3 pairs slightly smaller ca. 9 × 3 mm; styles 3, styles and along the midrib. Inflorescences of male and female stigmas pale yellow, ca. 0.4 cm long, Y-shaped, axillary, male inflorescence cymose, erect, shorter stigmas spiral. Fruit with a reddish-green hairy than the leaves, peduncles reddish, glabrous, male pedicel, 0.4–0.5 cm long, capsule obconical, 1.1– flowers many, female flower solitary, axillary, 1.2 × 0.5–1 cm, sparsely hairy, locules 3, wings 3 ovary and tepal unknown. Male flowers with a equal, thinly fibrous, 2–3 mm wide, splitting white pedicel 0.5–0.7 cm long; tepals 2, white, between the locules and wings. Seeds barrel-shaped, greenish near the apex, glabrous, margin serrate, tip 0.3–0.32 × 0.2–0.25 mm long, collar cells a quarter acute to acuminate, 0.8–0.9 × 0.4–0.5 cm; of the seed length. androecium with 20 stamens, cluster connate, yellow, filaments 0.1–0.3 cm; anthers golden Distribution. Bukit Tigapuluh National Park, yellow, broadly triangular to narrowly obovate, 0.3– Rengat, Riau Province, Sumatra. 0.4 mm long, tip slightly notched, opening by slits the full length of the anther, slits unifacial. Female Habitat & Ecology. Lowland rain forest at ca. 100 flowers unknown. Fruit with pedicel 1.5 cm long, m altitude. Terrestrial along the banks of streams, in capsular, green when young, becoming brown when wet and shaded areas. ripe, conical, ca. 4 × 0.5 cm locular part without wings and the total fruit ca. 4 × 2 cm including the Etymology. The epithet is derived from the Latin wings. Seeds barrel-shaped, 0.3–0.32 × 0.2–0.25 for ‗Thirty Hills‘, which is the meaning of the mm long, collar cells a quarter of the seed length. Indonesian name ‗Bukit Tigapuluh‘. Distribution. Bukit Tigapuluh National Park, Notes. Known only from the type locality, it is a Rengat, Riau Province, Sumatra. rare and obviously endemic Begonia being known from a scattered small population along a river Habitat and Ecology. Growing in wet areas along bank. It mostly resembles Begonia verecunda but it small stream margins and river banks 100–1300 m is different in having creeping stems, tepals with altitude. Found only from the type locality. toothed margins and three male flower tepals, and oblong fruits. This species has very attractive Etymology. From the Greek dolicho, meaning long; female flowers with a light red colour along the referring to the long fruit. margin of tepals. It has ornamental potential, especially for indoor use. Notes. This is a very distinct lowland forest Begonia species bearing single large fruits. The Specimens examined. Sumatra, West of Talanglakat on fruits are similar in size to those of Begonia atricha Rengat to Jambi Road, Bukit Karampal area, 04-10- but differ in the shape of capsule and length of the 1988, J.S. Burley et al. 1146. pedicel; B. atricha has longer pedicel and pendant bell-shaped fruit, whilst B. dolichocarpa has a more straight-sided fruit with a shorter, stouter pedicel. In Begonia dolichocarpa Girm., sp.nov. – Fig.2 habit, this species resembles Begonia isoptera in A Begonia padangensis omnino glaberrima et fructibus Java and B. padangensis in Sumatra, and can be axillaribus solitariis magis elongatis recedit – Typus: distinguished from both by its larger solitary fruits Sumatra, Riau Province, Bukit Tigapuluh National Park, up to 5 cm long. This species is also endemic to 30-07-2006, Deden 793 (holo BO; iso E, ANDA). Bukit Tigapuluh National Park. It is very local Begonia being known from scattered individuals Erect herb to ca. 100 cm tall. Stem erect, rhizoma- along the small stream margin and river bank. The tous at the base, reddish brown and pale green at the female flowers remain unknown. nodes, succulent, little branched, terete, glabrous, 232 REIN WARD TIA [VOL.13 1 cm e 1 cm 0.02 cm g f 0.5 cm 0.5 cm 0.2 cm a b c d Fig. 2. Begonia dolichocarpa Girm. a. Habit; b. Stipule; c. Male flower; d. Stamen; e. Fruit; f. Fruit in cross-section; g. Seed. (Based on type specimen, Deden 793). Drawn by Anne Kusumawaty (BO). 2012] GIRM ANSY AH: T wo new specie s of Be gonia ( Begon iaceae) from S umatra , Indon esia 233 Specimen examined. Sumatra, West of Talanglakat on F. E. 1998. The sections of Begonia including Rengat to Jambi Road, Bukit Karampal area, 02-12- descriptions, keys and species lists (Studies in Bego- 1988, J.S. Burley et al. 1796. niaceae VI). Wageningen Agricultural University Papers 98 (2): 1-266. ACNOWLEDGMENTS HUGHES, M. 2008. An annotated checklist of Southeast Asian Begonia. Royal Botanic Garden Edinburgh, I am grateful to the Director of Herbarium Bogoriense UK. for making available the specimens studied, Dr. Axel HUGHES, M., GIRMANSYAH, D., ARDI, W. H. & Dalberg Poulsen who encouraged me to collect Begonia NURAINAS. 2009. Seven new species of Begonia during his 2004 ginger expedition to Sumatra sponsored from Sumatra. Gardens’ Bulletin Singapore 61 (1): by the Carlsberg Foundation (ANS-0596/20), Dr. Mark 29-44. Hughes at the Royal Botanic Garden Edinburgh and Dr. SANDS, M. J. S. 2001. Begoniaceae in the Flora Laurence Skog at Smithsonian Institution‘s National Malesiana region. In Saw, L.G., Chua, L.S.L. & Museum of Natural History for their comments to an Khoo, K. C. eds, Taxonomy: the cornerstone of biodi- earlier version of the manuscript and for providing the versity. Proceedings of the Fourth International Flora Latin diagnose. I also thank the Director of Bukit Malesiana Symposium 1998. Forest Research Insti- Tigapuluh National Park and all of the staff for helping tute Malaysia, Kuala Lumpur. Pp. 161-168. during the field trip and Forestry Department for the TEBBITT, M. C. 2005. A new species of fleshy-fruited research permit to work in Bukit Tigapuluh National Begonia (Begoniaceae) from Sumatra. Blumea 50 (1): Park. I would like to thank Wahyudi Santoso and Anne 153-156. Kusumawaty for their excellent line drawings. WIDYATMOKO, D. & ZICH, F. 1998. The flora of Bukit Tigapuluh National Park, Kerumutan Sanctuary REFERENCES and Mahato Protective Reserve, Riau, Indonesia. Indonesian Botanic Gardens & Yayasan Sosial DOORENBOS, J., SOSEF, M. S. M., & De WILDE J. J. Chevron dan Texaco, Indonesia. 234 REIN WARD TIA [VOL.13 314 REINWARDTIA [VOL.13 ERRATUM REINWARDTIA Vol. 13, Part 2, 2010 1. Please change the existing word in p. 213, LINE 7 on ABSTRAK (written in Bahasa Indonesia version) with the following: Keberadaan dua jenis terakhir melampaui distribusi yang sebelumnya hanya diketahui di barat garis Wallace. 2. Please change the existing epithet name in p, 214, COLUMN 1, LINE 40 on Key to the species of Marantaceae in Sulawesi number 5.a. after Phrynium: longispicum INSTRUCTION TO AUTHORS Taxonomic identification key should be prepared using the aligned couplet type. Reinwardtia is a scientific journal on plant taxonomy, plant ecology, and ethnobotany. 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