Philadelphus hirsutus Nutt.

Shrubs, 5–20 dm. Stems brown, gray, or stramineous, branched, glabrous to densely strigose; bark deciduous, exfoliating or flaking, reddish; branches sprawling; axillary buds exposed. Leaves: petiole 1–9 mm; blade white or gray abaxially, green adaxially, broadly lanceolate to broadly ovate or narrowly to broadly elliptic, 2–8 × 1–5.5 cm, herbaceous, base narrowly cuneate to rounded, margins entire or irregularly to regularly serrate, crenate, or dentate, plane, abaxial surface slightly to densely loosely strigose, hairs often gently curved or arched-twisted, 0.7–1.5 mm, adaxial surface glabrate to moderately strigose, hairs usually evenly distributed, when sparse, sometimes distributed mainly along major veins, 0.2–0.8 mm, either thick-based and tightly antrorsely appressed or less thick-based, longer and looser, similar to abaxial hairs. Inflorescences cymes or cymose racemes, or flowers solitary, 1–3(–5)-flowered, proximal 2(–4) flowers often in axils of leaves or bracts. Pedicels 2–11 mm, moderately to densely strigose. Flowers: hypanthium glabrous or densely strigose, hairs tightly or loosely appressed; sepals ovate-lanceolate or triangular, 3–6 × 2–4 mm, apex acuminate, abaxial surface sparsely to densely strigose, adaxial surface glabrous except densely villous distally; petals white, oblong, obovate, or orbiculate, 5–13 × 4–13 mm; stamens 14–35; filaments distinct, 3–9 mm; anthers 1 × 0.7 mm; style 1, clavate, 4–6 mm; stigmatic portion 2–3 mm. Capsules obconic to obovoid, (3–)4–7 × 3–6 mm. Seeds not caudate, 0.9–1.2 mm. 2n = 26.

Can be grown by cuttings.