Sterile hybrid of nos. 4 [Mentha aquatica L.] and 7 [Mentha spicata L.]; rhizomatous and often also stoloniferous, 3-10 dm, glabrous or glandular, or the lvs often hirsute along the main veins beneath; main lvs ovate or lance-ovate to elliptic, serrate, acute to occasionally obtuse, 3-6 נ 1.5-3 cm, on petioles 4-15 mm; fls crowded in dense terminal spikes (sometimes interrupted below) 2-7 cm long and 1-1.5 cm thick at anthesis; cal 3-4 mm, the lobes hispid-ciliate, the tube without hairs; cor 3.5-5 mm; 2n=66, 72. European cultigen, now widely but rather sparingly established in moist low ground in our range and elsewhere in the U.S.

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

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