Saxifraga zhiminiae X. J. Zhang, Bo Xu & M. X. Zhao 2026, sp. nov.

Résumé fourni par la source

Saxifraga zhiminiae X. J. Zhang, Bo Xu & M. X. Zhao sp. nov. Figs 1, 2 Type. China • Xizang: Xigaze City, Dinggyê County, Chentang Town, 27°54'48"N, 87°29'18"E, alt. 3408 m, 13 October 2025, Bo Xu, Yongpeng Guo, Ziyi Wang, Sangbu Zhala Tsui- 4759 (holotype: KUN 1719076!; isotypes: KUN 1719075!, SWFC!). Diagnosis. Saxifraga zhiminiae resembling S. diversifolia and S. moorcroftiana, but the species is easily distinguished from the latter two and any other species of Saxifraga sect. Ciliatae by its plant glabrous, except for glandular-ciliate sepals, leaf blade abaxially red, petals adaxially pink or whitish, proximally dark red and abaxially red. Description. Herbs perennial, 15–30 cm tall. Stem glabrous. Basal leaves with petiole 3–6 cm, glabrous; leaf blade cordate to ovate-cordate, 1.8–4.0 × 1.2–3.0 cm, both surfaces and margin glabrous, adaxially green, abaxially green to purplish-red, base cordate, apex acuminate. Cauline leaves 8–12; petiole 0.6–3.5 cm, glabrous; leaf blade subcordate or ovate-cordate, 1.2–4.2 × 0.6–3.1 cm, base cordate or subcordate, apex acuminate; proximal leaf blades larger, both surfaces and marginally glabrous or subglabrous; distal leaf blades smaller, usually glabrous on both surfaces and margin. Cyme corymbose, 4–8 cm, 3–7 - flowered; pedicels 8–20 mm, glabrous. Sepals erect to spreading, narrowly ovate, 4.0–5.5 × 1.2–2.3 mm, purplish-red or greenish, glabrous on both surfaces, veins (3) – 5, margin glandular ciliate, apex obtuse or acute. Petals adaxially pink or whitish, proximally dark red, abaxially red, apex whitish, elliptic to obovate, 6–10 × 3–5 mm, usually not callose, (3 –) 5 (– 7) - veined, base narrowed into a short claw, apex obtuse. Stamens 5–8 mm long, filaments linear, dark red with a green base, anther yellowish-orange. Ovary superior, ovoid, 5–8.2 mm; styles 1–2 mm. Seeds elliptic, slightly curved at both ends, ca. 0.5 mm long. Phenology. Flowering and fruiting from August to October, based on field observations and herbarium specimens. Distribution and ecology. Saxifraga zhiminiae is currently known only from Chentang Town, Dinggyê County, Xizang, China, where it grows on moist cliff faces near waterfalls at elevations of 3000–3500 m. Etymology. Saxifraga zhiminiae is characterised by its attractive, red cordate leaves and striking petal colouration. The specific epithet honours Professor Zhimin Li of Yunnan Normal University, who has dedicated her career to botanical education. With unwavering commitment, she has inspired and nurtured numerous generations of botanists.

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