Philadelphus laxiflorus Rehder

Shrubs 2-3 m tall. Branchlets of previous year grayish brown or brown, those of current year brown, glabrous. Petiole 5-8 mm; leaf blade long elliptic or ovate-elliptic, 3-8 × 1.6-3 cm, abaxially glabrous or white villous along veins, adaxially strigose, veins 3-5, basifugal, base cuneate, margin serrate, apex acuminate or caudate. Racemes 7-9(-11)-flowered, lowest ones usually 3-flowered and cymose; rachis 3-12 cm; pedicels 5-12 mm. Calyx yellowish brown when dry; tube cupular, glabrous or strigose; lobes ovate, ca. 6 × 4 mm, conspicuously veined, apex acute. Corolla discoid; petals white, suborbicular, ca. 1.6 cm, hairy near base abaxially. Stamens 30-35, longest ones ca. 9 mm. Disc margin and style glabrous or sparsely white villous. Style divided for ca. 1/2 its length; stigmas clavate, 1-1.5 mm, shorter than anthers. Capsule ellipsoid, ca. 6 × 6.5 mm. Seeds ca. 3 mm, shortly tailed. Fl. May-Jun, fr. Aug.

Gansu, Henan, Qinghai, Shaanxi.

* Mixed forests, thickets in valleys, mountain slopes; 800-2000 m.