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: 93 − 94 93 IMPATIENS RUBRICAULIS (BALSAMINACEAE), A NEW SPECIES OF IMPATIENS FROM WEST SUMATRA. Received November 3, 2009; accepted December 8, 2009 NANDA UTAMI Herbarium Bogoriense, Botany Division, Research Center for Biology-LIPI, Jl. Raya Jakarta Bogor Km 46, Cibinong 16911, Indonesia. E-mail: utami_16002@yahoo.com ABSTRACT UTAMI, N. 2009. Impatiens rubricaulis (Balsaminaceae), a new species of Impatiens from West Sumatra. Reinwardtia 13(1): 93–94. — Impatiens rubricaulis Utami (Balsaminaceae) is described as a new species. Key words: Impatiens rubricaulis, Balsaminaceae, new species, West Sumatra ABSTRAK UTAMI, N. 2009. Impatiens rubricaulis (Balsaminaceae), jenis baru yang berasal dari Sumatra Barat. Reinwardtia 13 (1): 93–94. — Impatiens rubricaulis Utami (Balsaminaceae) dipertelakan sebagai jenis baru. Kata kunci : Impatiens rubricaulis, Balsaminaceae, jenis baru, Sumatera Barat INTRODUCTION In 2009, one more specimen of Impatiens (Balsaminaceae) from Air Sirah, West Sumatra was collected. In a revision of Sumatran Impatiens Grey -Wilson (1989) described 29 species from Sumatra. To this number Shimizu & Utami (1997) and Utami (2005) added three species of Impatiens i.e., I. tuju- hensis Utami & Shimizu, I. batanggadisensis Utami and I. sorikensis Utami. The species are found in montane forest, along rivers, streams and near wa- terfalls. Almost all Sumatran species have yellow or orange-yellow flowers and green stems. Its reddish stem, shape of the floral organ is clearly show it could not be attributed to any known species. This specimen hence represents a new, undescribed spe- cies belonging to section Macrocentron Warb. & Reiche (1895). Impatiens rubricaulis Utami, spec. nov. — Figs. 1 & 2. Impatiens delectans Ridl. affinis, sed alae, vexillum, sepalum inferior forma and colore caulis differt –Typus: Rani & Nanda Utami 487 (BO), Indonesia, West Suma- tra, Solok, Air Sirah, 1000 m asl. Decumbent perennial herb up to 20 cm tall; stems thin, reddish, rooting at the lower nodes, gla- brous. Leaves alternate; petiole 1-2 cm long, stipi- tate glands on each side; lamina ovate to elliptic, 1- 4.5 by 1-1.5 cm, base acute, apex acute, upper and lower part glabrous, margin serrate, each tooth ter- minated by a distinct, ca. 1 mm long. Inflorescences usually 1-flowered. Flowers bright yellow. Pedun- cles ca. 2.5 cm long, glabrous. Lateral sepals 2, flat- tened, elliptic, ca. 0.5 by 0.2 cm, red purple, gla- brous; lower sepal shallowly navicular, ca. 1.5 cm long, 1 cm deep, abruptly constricted into a curved filliform spur; spur ca. 2 cm long, white with pink tinge, glabrous. Dorsal petal ovate, red-orange ca. 1.5 by 0.5 cm wide; lateral ones united, ca. 2 cm long; uppert part of each pair ± obovate, c. 1.5 cm by 0.5 cm.; lower part of each pair ± obliquely ellip- tic, c. 0.5 cm by 0.3 mm. Ovary glabrous. Fruit a capsule, fusiform, ca.5 by 3 mm diam., glabrous. Distribution. Endemic in West Sumatra Habitat. Along the road on the moist places at 1000 m asl. Note. This plant is similar to I. delectans Ridl., but differs from it in having a reddish stem, a different shape of the dorsal petal, lateral united petals and lower sepal. In I. delectans the stems are green, the dorsal petal cuculate with a “keel like” crest above, lower sepal shallowly navicular and abruptly con- stricted into a straight spur. The lateral united petal have a ± ovate upper part and an ± elliptic lower part. Additional specimens examined. INDONESIA. Suma- tra: West, G. Kerinci. April 1920. Bünnemeijer 9845 (BO) & May, 1920, Bünnemeijer 9998 (BO); Gn. Gadut, 25 Jan., 1988; M. Hotta et al. 24 (BO); Kalumbuk, Tabek, Talang Babungo, Alahan Panjang, 31 Dec, 1987, H. Okada et al 55 (BO). REINWARDTIA 94 [VOL.13 ACKNOWLEDGEMENTS I would like to thank to Directorate General of Higher Education Indonesia (DIKTI), Ministry of National Edu- cation (MENDIKNAS) “Insentif Bagi Peneliti dan Perekayasa Tahun 2009” for their financial support for this work. Thanks are due Profs. Drs. Peter C. van Wel- zen of Nationaal Herbarium Nederland-Leiden Universiteit and J.P. Mogea for reviewing this manuscript. REFERENCES GREY-WILSON, C. 1989. A revision of Sumatran Im- patiens. Studies on Balsaminaceae VII. Kew Bull. 44: 67-106. SHIMIZU, T. & N. UTAMI 1997. Three new species of Impatiens (Balsaminaceae) added to Flora Malesiana. Kew Bull. 52: 435-442. UTAMI, N. 2005. Two new species of Impatiens (Balsaminaceae) from Batanggadis National Park, North Sumatra, Indonesia. Blumea 50: 443-446. WARBURG, O. & REICHE, K. 1895. Balsaminaceae. In: ENGLER, A. (Ed.). Die Naturlichen Planzenfami- lien III, 5: 390-392. Fig.1. Habit of Impatiens rubricaulis Utami spec. nov. a b Figs.2. Flora organs of Impatiens rubricaulis Utami a. Lateral united petals, b. Dorsal petal, c. Lower sepal and spur, d. Two lateral sepals c d a cover.pdf REINWARDTIA_13_1_291209_nanda2.pdf