From Flora of Indiana (1940) by Charles C. Deam
This species is frequent in the southern part of the state and infrequent to local in the northern part. It grows in wet places in woodland, in ditches, and on the muddy borders of sloughs and streams.
Plants stoloniferous, generally without tubers; stems ±densely appressed-hairy; lvs ±long hairy and on the lower surface usually also short-felty, lanceolate or lance-ovate to elliptic or narrowly rhomboid, 5-12 נ1.5-5 cm, acuminate, coarsely serrate, the lowest tooth not far below the middle of the blade, the margin below it concave and continued along the midvein nearly or quite to the stem; bracts minute; cal 1-1.2 mm, the 4 lobes ovate or triangular-ovate, half to three- fourths as long as the tube; cor generally 4-lobed, but the upper lobe often notched; stamens included or barely reaching the orifice of the cor; nutlets surpassing the cal, the set of 4 almost flat across the tuberculate summit, each 1.5-2 נ0.7-1.3 mm, the inner angle nearly as long as the outer and ending in a tubercle. Mass. to n. Fla., w. to N.Y., Pa., s. Ind., Mo., e. Okla., and e. Tex. (L. membranaceus) Hybridizes extensively with no. 2 [Lycopus uniflorus Michx.] where their ranges overlap, producing a hybrid swarm called L. سherardii Steele.
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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