Mentha laxiflora

Procumbent sometimes rhizomatous herb to 60 cm high; branches with sparse to dense, septate, spreading or retrorse hairs. Leaves ovate or oblong-ovate, 10–80 mm long, 5–30 mm wide, surfaces with scattered septate hairs, apex obtuse to acute, margin serrate; petiole 1–12 mm long. Flowers in loose c. 4–8(–12)-flowered clusters in axils of distal leaves; pedicels usually subequal to or longer than calyx. Calyx 3.5–5 mm long, c. 15-veined, lobes acuminate, c. one-quarter to half as long as tube, sparsely to densely hairy outside; corolla white to mauve or pale blue, exceeding calyx by 3–5 mm, lobes 2.5–3.5 mm long, the posterior one shallowly emarginate; anthers strongly exserted. Flowers Jan.–Jul.