Type: CHINA. Zhejiang Province, Linan County, Tianmu mountians, Dajingwu, under the deciduous broad-leaved forests, 30°23’1.39’’N, 119°26’31.64’’E, elevation 1156 m, 21 October 2022, Yue-Liang Xu and Chun-Mei Pang, Xu2813 (holotype: ZM barcode ZMNH0068011, Fig. 5).

Description: Herbs perennial, with onion-like odor. Bulbs clustered, ovoid, 1‒2 cm in diam.; tunic white, sometimes tinged with purple brown, membranous, entire. Leaves linear, shorter than scape, 10‒25 cm × 3‒9.5 mm, flat, fistulose, clearly 1-keeled abaxially, appearing in autumn (Oct.-Nov.), withered in spring (May). Scape lateral, 15‒40 cm × 0.8‒2.0 mm, terete, solid, covered with leaf sheaths only at base; Spathe 2‒3-valved, membranous, persistent; Umbel nearly hemispheric, laxly flowered, bearing bulblets and flowers or bulblets only; pedicels subequal, 1‒2 cm long, 2.5‒ 4 × as long as perianth, bracteolate. Perianth pale purple; segments with green midvein, free at base; inner segments slightly longer and wider than outer ones, ovate-oblong, obtuse or rounded at apex, 5‒6 × 3‒4 mm; outer ones oblongelliptic, clearly boat-shaped, obtuse or rounded at apex, 4‒5 × 2‒3 mm. Filaments subequal, 7‒9 mm long, slightly broadened at base, entire, connate at base and adnate to perianth segments; anthers oblong, reddish brown, rounded at the apex. Ovary trivalved, obovoid-globose, smooth, greenish, base constricted into a short stipe 0.5‒1 mm long, with concave nectaries covered by hoodlike projections at base; ovules two per locule. Style simple, 5‒6 mm long, exserted; stigma entire. Capsule obovoid, 5‒7 × 6‒9 mm. Seeds dark brown, subovoid-flattened, 3‒4 × 4‒5 mm, testa with densely cellular periclinal walls.

Distribution and habitat: The new species is only known from Tianmu Mountian of Linan County, northwestern Zhejiang (Fig. 6). It grows under the deciduous broad-leaved forests at the elevation of 1000‒1500 m.

Phenology: Flowering from September to October, fruiting from October to November.

Etymology: The specific epithet ‘ tianmuense ’ refers to the type locality of the new species.

Similar species: The new species is closely related to A. thunbergii and A. chinense. It is mainly distinguished from them by its flat leaves, 3‒9.5 mm wide, withered in spring and umbel bearing bulblets. The distinguishing characteristics of the new species and the two relatives are listed in detail in Table 1.

Additional specimen examined (Paratypes): CHINA. Zhejiang Province, Linan County, Tianmu mountian, Niling, beside the ditch, 30°24.480’N, 119°27.738’E, elevation 1050 m, 21 September 2019, Zhen-Hai Chen et Li-Peng Yu, LA19092101 (ZM); ibidem, 28 October 2022, Yue-Liang Xu, Xu 2814 (ZM); ibidem, 21 November 2022, Yue-Liang Xu, Xu 2816 (ZM); ibidem, roadside at forest margin, elevation 1000 m, 21 September 2019, Zhen-Hai Chen et Li-Peng Yu, LA19092102 (ZM); Dajingwu, under the deciduous broad-leaved forests, elevation 1150 m, 9 November 2021, Yue-Liang Xu et Bin-Yang Din, Xu 2732 (ZM); ibidem, 21 November 2022, Yue-Liang Xu, Xu 2815 (ZM).