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This species is accepted, and its native range is Sumatera.

[KBu]

Utami, N. Kew Bull (2012) 67: 731. https://doi.org/10.1007/s12225-012-9403-3

Type
Type: Indonesia, Sumatra, Mt Pantai Cermin, DedenGirmansyah 1536 (holotype BO!).
Habit
Perennial herb up to 35 mm tall; simple, rooting at the lower nodes, pubescent
Leaves
Leaves alternate, congested towards the apices of the stems, purple and sometimes green; lamina ovate, 4 – 55 × 8 – 27 mm, base acute, margin serrate to crenate, apex acute, lateral veins 3 – 7 pairs, venation obvious, pubescent, petiole 10 – 25 mm long, pubescent
Inflorescences
Inflorescences 1 or 2-flowered; flowers obvious, pubescent, petiole 10 – 25 mm long, pubescent, flowers yellow with a red blotch on the lower part
Peduncles
Peduncles c. 45 mm long, pubescent
Bracts
Bracts linear, 5 – 7 mm, pubescent
Pedicel
Pedicel c. 18 mm long, Lateral sepals 2, ovate to elliptic, 4 – 5 × 7 – 9 mm, reddish to yellowish, pubescent
Calyx
Lower sepal shallowly navicular, c. 5 × 10 mm, blotched with red inside, abruptly constricted into a filiform spur, 20 – 25 mm long, curved towards the tip, reddish to yellowish, pubescent
Corolla
Lateral petals united, upper part of each pair ovate to oblong, apiculate, c. 15 × 10 mm, yellow, lower part of each pair asymmetrical, ± ovate, c. 4 × 6 mm, yellow with red spot Dorsal petal shallowly cuculate, c. 5 × 10 mm, reddish to yellowish, pubescent
Ovary
Ovary glabrous
Fruits
Fruit a capsule, fusiform, c. 5 × 14 mm, glabrous
Figures
Figs 1 and 2.
Distribution
Endemic to Indonesia: West Sumatra. Known only from Mt Pantai Cermin in South Solok (1.16546°S, 100.51266°E).
Ecology
Growing along riverside; alt. 1600 m.
Conservation
The species only grows in this area and appears to be common only on Mt Pantai Cermin. The population needs to be assessed accurately before it can be classified as anything other than Data Deficient (DD) (IUCN 2001).
Phenology
Flowering May – Oct.
Note
Impatiens ekapaksiana typically has small yellow, red-marked flowers and finely pubescent peduncles, venations and petioles. I. ekapaksiana closely resembles I. sidikalangensis Grey-Wilson; they differ in floral details, the latter species having white or pale pink flowers, and a lilac purple stain on the dorsal petal and at the base of the two lateral petals. The species epithet is given in honour of TNI-KOPASSUS (the Indonesian Special Forces) for their dedication and encouragement to conserve the environment and biodiversity in Sumatra. Ekapaksiana is derived from ‘Bintang KarthikaEkaPaksi’, a sign of appreciation issued by the army of Indonesia.

Native to:

Sumatera

Impatiens ekapaksiana Utami appears in other Kew resources:

First published in Kew Bull. 67: 731 (2012)

Kew Backbone Distributions
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

Kew Bulletin
Kew Bulletin
http://creativecommons.org/licenses/by-nc-sa/3.0

Kew Names and Taxonomic Backbone
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0