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| Impatiens damingensis S. X. Yu, C. Y. Xia & H. P. Deng
in Xia, Gadagkar, Li, Deng & Yu, 2019.
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Abstract
Impatiens damingensis S. X. Yu, C. Y. Xia & H. P. Deng, (Balsaminaceae) discovered in Guangxi, China, is described and illustrated here. This species is similar to I. aquatilis Hook.f., but differs from the latter by having blades that are ovate or ovate-lanceolate vs. lanceolate, ovate-lanceolate, or ovate-oblong; apices of bracts acute vs. glandular awned; apices of lateral sepals mucronulate vs. long mucronulate; and spur slender substraight or slightly incurved vs. incurved. Furthermore, molecular data as well as micro-morphological evidence under SEM (of pollens and seeds) also support the establishment of the new species.
Key words: Balsaminaceae, Impatiens, morphology, new species, phylogeny, SEM
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| FIGURE 1. Impatiens damingensis S. X. Yu, C. Y. Xia & H. P. Deng. A. plant; B. bract; C. lateral sepal; D. vexillum; E. wings; F. labellum; G. filaments and anthers; H. ovary; I. capsule. Drawn by Y. B. Sun from S. X. Yu 3227. |
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| FIGURE 2. A–F: Impatiens damingensis S. X. Yu, C. Y. Xia & H. P. Deng. A. Habitat; B. plants; C. flower, lateral view; D. flower, front view; E. flower and capsule; F. flower branch. G–I: Impatiens aquatilis Hook. f. G. plants; H: flower, lateral view; I: flower, front view. |
Impatiens damingensis S. X. Yu, C. Y. Xia & H. P. Deng, sp. nov.
Type. China. Guangxi: Wuming, Damingshan; shade and damp places, Alt. 1220m, 2004-09-02, S. X. Yu 3227 (Holotype, PE; Isotype, IBK), same place, 2002-07-09, Y-G Wei 0205 (IBK).
Diagnosis. Similar to I. aquatilis Hook.f. in having racemose inflorescences, two lateral sepals and ellipsoid seeds, but is different by way of having ovate or ovate-lanceolate blades, acute apices of bracts, mucronulate apices of lateral sepals, and a slender and slightly incurved spur. SEM results also reveal distinct differences in seedcoat and pollen grain micro-morphology when compared to I. aquatilis.
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Etymology: The specific epithet ‘damingensis’ refers to the locality of the type specimen, Daming Mountain, Wuming County, Guangxi, China.
Chang-Ying Xia, Sudhindra R. Gadagkar, Jin Li, Hong-Ping Deng and Sheng-Xiang Yu. 2019. Impatiens damingensis (Balsaminaceae), A New Species from Guangxi, China. Phytotaxa. 399(3); 239–247. DOI: 10.11646/phytotaxa.399.3.6
