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| Impatiens longcanggouensis Q.Luo, in Luo, Chen, Yuan, Yang, Liu, Song et Ma, 2026. |
Abstract
Impatiens longcanggouensis Q.Luo (Balsaminaceae), a new species from Yingjing County, Sichuan Province, China, is described and illustrated. Its morphology, including pollen and seed characters observed via scanning electron microscopy (SEM), is documented in detail. The new species is morphologically similar to I. recurvicornis, but is readily distinguished by the following combination of characters: leaf margin shallowly arcuate-serrate (vs. serrulate); abaxial leaf surface usually purplish-red (vs. pale green); inflorescence commonly two-flowered (vs. one-flowered); bracts lanceolate, 2–2.5 mm long (vs. ovate, 3–4 mm long); flowers 1.2–1.8 cm long (vs. 3–4 cm long); dorsal petal 6–8 mm in diameter, with two erect, stout rostella along the abaxial mid-vein (vs. dorsal petal ca. 13 mm in diameter with a beaked apex); lower sepal narrowly funnel-form with a spreading mouth (vs. navicular with an oblique mouth); and capsule clavate (vs. linear).
Key words: Balsaminaceae, China, Impatiens longcanggouensis sp. nov., Sichuan
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| Impatiens longcanggouensis sp. nov. A. Upper plant; B. Lower plant; C. Flower, lateral view; D. Flower, frontal view; E. Bract; F. Lateral sepals; G. Dorsal petal; H. Lateral united petals; I. Lower sepal; J. Anther. Drawn by Wang Ling from Q. Luo (holotype: PE). |
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| Impatiens longcanggouensis sp. nov. A. Habitat; B. Plant; C. Leaves; D. Adaxial scabrous hairs; E. Capsules; F. Flower anatomy; G–K. Flowers from different angles. |
Impatiens longcanggouensis Q.Luo, sp. nov.
Diagnosis. Impatiens longcanggouensis is morphologically similar to I. recurvicornis, but is readily distinguished by the following combination of characters: leaf margin shallowly arcuate-serrate (vs. serrulate); abaxial leaf surface usually purplish-red (vs. pale green); inflorescence commonly two-flowered (vs. one-flowered); bracts lanceolate, 2–2.5 mm long (vs. ovate, 3–4 mm long); flowers 1.2–1.8 cm long (vs. 3–4 cm long); dorsal petal 6–8 mm in diameter, with two erect, stout rostella along the abaxial mid-vein (vs. dorsal petal ca. 13 mm in diameter with a beaked apex); lower sepal narrowly funnel-form with a spreading mouth (vs. navicular with an oblique mouth); and capsule clavate (vs. linear).
Etymology. The epithet longcanggouensis refers to the type locality: Longcanggou Yinjing County, Sichuan Province, China. The new species is named ‘龙苍沟凤仙花’ in Chinese.
Qiang Luo, Hong Chen, Ying Yuan, Hong Yang, Chan Liu, Xinqiang Song and Shen Ma. 2026. Impatiens longcanggouensis (Balsaminaceae): A New Species from Sichuan, China. PhytoKeys. 270: 1-12. DOI: doi.org/10.3897/phytokeys.270.174879
