Saturday, February 20, 2016

[Botany • 2015] Impatiens tianlinensis • A New Species (Balsaminaceae) from Guangxi, China


Impatiens tianlinensis 
S. X. Yu & L. J. Zhang

Abstract

Impatiens tianlinensis S. X. Yu & L. J. Zhang, a new species of the Balsaminaceae from Cenwang Laoshan Mountain, Tianlin County, Guangxi Region, is described and illustrated. This species closely resembles I. apalophylla and I. clavigera var. auriculata in having racemose inflorescences, 4 lateral sepals, hammer-shaped capsules and ellipsoid seeds, but differs in having sessile glanduliferous petioles, few-flowered inflorescences, incurved spur, yellow lower sepal without reddish patches, yellowish petals and lower sepal, and acuminate dorsal petal apex. The molecular data, from nuclear ribosomal and plastid genes, as well as pollen characters also support that the species is new to science.

Keywords: Balsaminaceae, molecular data, new species, phylogeny, pollen character, China, Eudicots


Taxonomy

Impatiens tianlinensis S. X. Yu & L. J. Zhang, sp. nov. (Figs. 1–2)
This species is similar to I. apalophylla Hook. f. (1908: 243) and I. clavigera var. auriculata in having racemose inflorescences, 4 lateral sepals, hammer-shaped capsules and ellipsoid seeds, but differs in sessile glanduliferous petioles, few-flowered inflorescences, incurved spur, yellow lower sepal without reddish patches, yellowish petals and lower sepal, and acuminate dorsal petal apex.

Type:— CHINA . Guangxi: Tianlin county, Cenwang Laoshan Mountain, in a valley near the river, 24°24’04.7” N, 106°23’09.5” E, ca. 1260 m, 9 Oct 2007, S. X. Yu 3731 (holotype PE!, isotype IBK!).

 Phenology:— Flowering and fruiting from September to November.

Ecology:— This new species grows in a valley at an elevation of 1100–1300 m. s. m., in a disturbed forest. The population is apparently small.

Distribution:— Except the type locality, I. tianlinensis is also known from Lingyun, Fengshan, Leye and Nandan of Guangxi.

Etymology:— The specific epithet ‘tianlinensis’ refers to the type locality



Lei Zeng, Yan-nan Liu, Rajib Gogoi, Lin-jing Zhang and Sheng-xiang Yu. 2015. Impatiens tianlinensis (Balsaminaceae), A New Species from Guangxi, China. Phytotaxa. 227(3): 253–260. DOI: 10.11646/phytotaxa.227.3.4


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