Sinocrassula adpressa J. Guan Wang Wang et al. YUS 2025, sp. nov.

Sinocrassula adpressa J.Guan Wang sp. nov. (Figs 2, 3) Type:— CHINA. Yunnan: Dongchuan County, Tangdan Town, 25°58′23.1″ N, 103°7′9.0″ E, elev. ca. 2167 m, 2 December 2023, Jia-Guan Wang YUS-9494 (holotype: YUKU!; isotype: YUKU!). Diagnosis:— Morphologically, Sinocrassula adpressa is similar to S. densirosulata and S. yunnanensis, while can be easily recognised from known species by the following characters: plant with rosulate and glabrous; stem purple red with spots; leaves spatulate, purple red with spots; sepals obovate-triangle, purple; Nectar scales nearly rectangular; petals central protrusion with red stripe. Plants terrestrial or lithophytic, perennial, 8–22 cm tall, glabrous, rosette 2–5 × 2–5 cm. Roots fibrous. Basal leaves ca. 30, base green or red, spatulate, 1.3–1.8 × 0.4–0.7 cm, upward purple red with spots. Flowering stem elongated, 5–20 cm, purple red with spots, unbranched or branched near base. Stem leaves alternate, spatulate to elliptic, 0.9–1.5 × 0.2–0.5 cm, orbicular at base. Inflorescences corymbiform, ± dense, ca. 2.0– 5.5 cm in diam, many flowered. Bracts few, elliptic. Flowers small, ca. 3.0– 3.5 mm in diam; pedicels purple red, slightly shorter than flowers. Sepals obovate-triangle, purple, ca. 1.2–1.7 × 0.5–0.8 mm, minutely papillate, apex obtuse to acuminate, base rounded to cuneate. Petals purple white, base white, central protrusion with red stripe, deeply purple red upward, ovate triangular, 2.0–3.1 × 0.9–1.2 mm. Stamens slightly longer than petals, ca. 2.5 mm; filaments basally gradually broadened; anthers golden yellow. Nectar scales nearly rectangular, ca. 0.5–0.7 × 0.3–0.5 mm. Carpels 5, lanceolate, 1.7–2.3 mm. Styles slender, short, upward purple red with spots, ca. 0.4–0.7 mm. Flower Sep-Nov. During the flowering period, the bracts and stem leaves are prone to shedding and undergo asexual reproduction. Additional specimens examined (paratypes): — CHINA. Yunnan: Kunming City, Dongchuan County, Hongtudi Town, 26°4′29.6″ N, 103°2′23.1″ E, elev. ca. 2176 m, 25 May 2023, Jia-Guan Wang & Chao Chen YUS-9570 (YUKU!). Geographical distribution:— Currently, Sinocrassula adpressa is only found in Dongchuan County of Yunnan Province based on our current knowledge, and may represent a species endemic to Yunnan, China. Ecology:— Sinocrassula adpressa is observed to grow in rock crevices in a dry-hot valley, at elevations between 2,100 and 2,300 m. Etymology:— The specific epithet adpressa indicates that the species grows closely to the ground. The Chinese name is suggested as ‘伏地ƋK (fu di shi lian)’. IUCN Red List category:— Our field surveys revealed that Sinocrassula adpressa located in a provincial-level public welfare protected forest area and widely distribution in a dry-hot valley. The population of the holotype locality is the largest and is in good condition. Therefore, the new species is preliminarily assessed as Least Concern (LC) according to IUCN (2023).