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| Impatiens bungeusing Mustaqim & Ruchis., in Mustaqim, Arico, Jayanthi, Andini, Pratiwi et Ruchisansakun, 2024. |
Abstract
Impatiens is a diverse genus within the Balsaminaceae family, comprising over 1,120 species. The northern Gayo Plateau of Sumatra, an island in Southeast Asia, is renowned for its rich Impatiens diversity. In this paper, we described and illustrated a new species named Impatiens bungeusing from this area. This species is most similar to Impatiens vitellina Grey-Wilson but differs in having the distinct abaxial leaf venation in a dry state (vs obscure), lateral sepals falcate-oblong (vs narrowly lanceolate), lower sepals with U-shaped spur (vs straight), broadly ovate dorsal petal (vs ovate), and ovate sub-rhomboidal upper lateral united petals (vs oblong). This discovery brings the total number of known Impatiens species in Sumatra to forty-eight.
Keyword: Ericales, herbs, Impatiens tapanuliensis, Impatiens vitellina, Malesia, limestone plant, taxonomy, Uniflorae
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| Morphology of Impatiens bungeusing Mustaqim & Ruchis., sp. nov. A. Plants in habitat. B. Living plant. C. Inflorescence. D. Flower. E. Lateral sepals. F. Dorsal petals. G. Lateral united petals. H. Lower sepal. I. Pedicel and ovary. J. Fruit. Scale: A = 4 cm, B = 3 cm, C–D = 1 cm, E = 2 mm, F = 3 mm, G–J = 5 mm. Photographs by Wendy A. Mustaqim. |
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| Morphology of Impatiens bungeusing Mustaqim & Ruchis., sp. nov. A. Plant. B. Leaves showing petiole. C. Leaves showing apex and margin. D. Inflorescence. E. Flower, frontal view. F. Flower, lateral view. G. Pedicel, lower sepal, stamens, and ovary. H. Lateral sepal. I. Dorsal petal. J. Lateral united petals. Scale: A = 3 cm, B–D = 5 mm, E–G = 1 cm, H = 3 mm, I–J = 5 mm. Illustrated by Yuanito Eliazar. |
Impatiens bungeusing Mustaqim & Ruchis., sp. nov.
Type: Indonesia. Aceh Province: Aceh Tengah Regency, Jagong Jeget, ..., 2100 m asl, 11 January 2023, Mustaqim 2577 (holotype: LGS; isotype: MEDA).
Diagnosis: Impatiens bungeusing is similar to Impatiens vitellina Grey-Wilson. However, it differs in having the distinct abaxial leaf venation in a dry state (vs obscure), flowers with lower sepal having U-shaped spur (vs straight), broadly ovate dorsal petal (vs ovate), and ovate sub-rhomboidal upper lateral united petals (vs oblong) (Table 1).
Etymology: The specific epithet "bungeusing" is derived from the Gayo language. "Bunge" means flower, and "using" means yellow, reflecting the plant's bright yellow flowers.
Wendy A. Mustaqim, Zulfan Arico, Sri Jayanthi, Wanda R. Andini, Devi Pratiwi and Saroj Ruchisansakun. 2024. Impatiens bungeusing (Balsaminaceae), A New species from the Northern Gayo Plateau, Sumatra, Indonesia. Taiwania. 69(4); 554-559. DOI: 10.6165/tai.2024.69.554 taiwania.ntu.edu.tw/abstract/2035
