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| Saxifraga sunhangiana T. Deng, X.J. Zhang & J.T. Chen, in Zhang, Kuang, Chen, Li, Peng, Guan, Huang, Wang et Deng, 2022. |
Abstract
Saxifraga sunhangiana, a new species of the genus Saxifraga sect. Irregulares (Saxifragaceae) from Gansu, China, is described and illustrated. This species is distinguishable by its abaxial leaf surface with singularly long white villous hairs and rather long rhizomes. Morphological and molecular data indicate that S. sunhangiana belongs to S. sect. Irregulares, and closely related to S. rufescens. The new species differs from S. rufescens by its terminal flower with two elongated, fusiform-lanceolate petals and leaves with glabrous petiole.
Keyword: Irregulares, ITS sequences, Saxifraga fortune, S. rufescens, taxonomy, phylogeny
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| Illustrations of Saxifraga sunhangiana T. Deng, X.J. Zhang & J.T. Chen. A & B. Flower, petals 5; C. Fruit, capsule winged when mature; D. Adaxial leaf surface glabrous to sparsely hispid; E & G. Abaxial leaf surface with long white villous hairs, ca. 10 mm, unspotted; F. Inflorescence; H. Rhizomes glabrous, petiole base sheathed; I. Scape glabrous to sparsely white glandular piliferous; J & K. Plants and habitat. (Photos by Xin-Jian Zhang and Jun-Tong Chen.) |
Saxifraga sunhangiana T.Deng, X.J.Zhang & J.T.Chen, sp. nov.
文縣虎耳草
Diagnosis: Saxifraga sunhangiana is distinguishable by its abaxial leaf surface with singularly long white villous hairs and its rather long rhizomes. It morphologically resembles S. rufescens, from which it is easily distinguished by its flower with two elongated petals fusiform-lanceolate (vs. flower with only one elongated petal lanceolate to linear); petiole glabrous (vs. petiole red-brown glandular villous); leaf blade adaxially glabrous to sparsely strigose (vs. leaf blade adaxially strigose).
Etymology: Saxifraga sunhangiana is named after Prof. Sun Hang (1963–present), director of the Kunming Institute of Botany (China) who conducted extensive research in plant taxonomy, biogeography, and evolutionary biology and made outstanding contributions towards understanding the plant diversity of China.
Distribution and ecology: The new species Saxifraga sunhangiana is currently known only from Wenxian County, Gansu Province, China. It grows on moist rocks nearby valleys, alt. 1800−2750 m.
Xin-Jian Zhang, Tian-hui Kuang, Jun-Tong Chen, Li-Juan Li, Jing-Yi Peng, Kailang Guan, Xian-Han Huang, Heng-Chang Wang and Tao Deng. 2022. Saxifraga sunhangiana (Saxifragaceae), A New Species from Gansu, China. Taiwania. 67(2); 195-200. DOI: 10.6165/tai.2022.67.195
