This section is from the book "An Illustrated Flora Of The Northern United States, Canada And The British Possessions Vol3", by Nathaniel Lord Britton, Addison Brown. Also available from Amazon: An Illustrated Flora of the Northern United States, Canada and the British Possessions. 3 Volume Set..
Lycopus europaeus var. sessilifolius A. Gray, Man. Ed.
Glabrous, or puberulent above, tuberiferous, perennial by stolons and suckers; stem simple, or at length branched, erect, 1°-2° high. Leaves ovate-lanceolate or oblong-lanceolate, closely sessile, acute or acuminate at the apex, sharply serrate, somewhat narrowed at the base, l'-2 long; bracts very small, acute; calyx-teeth usually 5, subulate, rigid, nearly as long as the tube; corolla twice as long as the calyx; rudimentary posterior stamens oval; nutlets shorter than the calyx.
In wet soil, eastern Massachusetts to Florida and Mississippi, near the coast. Aug.-Oct.
Glabrous or minutely puberulent, perennial by leafy stolons; stem erect or ascending, simple or at length freely branched, 1°-3° high. Leaves ovate to oblong-lanceolate, or narrower, acuminate at the apex, usually dentate, narrowed or cuneate at the base, 2'-5' long, 1/2'-1 1/2' wide, usually tapering into a conspicuous petiole; bracts minute, acute or acuminate; calyx-teeth triangular-subulate, herbaceous, one-half as long as the tube or more; corolla longer than the calyx; rudimentary posterior stamens oval or oblong; nutlets much shorter than the calyx.
In wet soil, southern Vermont to Florida, Minnesota, Arkansas and Louisiana. Gipsywort. July-Oct.
Lycopus sinuatus Ell. Bot. S. C. & Ga. 1: 26. 1817.
Lycopaeus europaeus var. sinuatus A. Gray, Man. Ed. 5, 346. 1867.
Puberulent or glabrous, perennial by suckers; stem stiff, erect, simple or branched, 1°-2° high. Leaves lanceolate or ovate-lanceolate in outline, petioled, acuminate at the apex, incised, pinna-tifid or the uppermost merely serrate, 2'-4' long; bracts subulate, the outer ones sometimes exceeding the calyx; calyx-teeth triangular-subulate, cuspidate, rigid; corolla little exceeding the calyx; rudimentary posterior stamens thickened at their tips; nutlets much shorter than the calyx.
Lycopus asper Greene, Pittonia 3: 339. 1898. Lycopus lucidus var. americanus A. Gray, Proc. Am. Acad. 8: 286. 1870.
Pubescent or glabrate, perennial by stolons; stem usually stout, erect, strict, leafy, simple, or sometimes branched, 1°-3° high. Leaves oblong-lanceolate, acute at the apex, narrowed or rounded at the base, sessile, or very short-petioled, 2'-6' long, 1/4'-1 1/2' wide, sharply serrate with acute ascending teeth; bracts ovate or lanceolate, acuminate-subulate, the outer ones often as long as the flowers; calyx-teeth 3, subulate-lanceolate, nearly as long as the tube; corolla little longer than the calyx; rudimentary stamens slender, thickened at the tips; nutlets much shorter than the calyx.
In wet soil, Michigan to Kansas, west to Manitoba, British Columbia, California and Arizona. Regarded in the first edition of this work as the same as L. lucidus Turcz. of NW. America and NE. Asia. July-Sept.
Lycopus europaeus L. Sp. Pl. 21. 1753.
Puberulent or pubescent, perennial by suckers; stems stout, at length widely branched, 1°-2 1/2° high. Leaves ovate, ovate-oblong, or oblong-lanceolate, short-petioled, or the upper sometimes sessile, coarsely dentate, or the lower incised at the base, 1'-3' long, 1/2'-1' wide; bracts subulate-lanceolate, the outer shorter than or equalling the flowers; calyx-teeth subulate-spinulose; corolla scarcely longer than the calyx; rudimentary posterior stamens obsolete; nutlets shorter than the calyx.
In waste places, Massachusetts to Virginia. Naturalized from Europe. Green archangel. Bitter bugle-weed. July-Sept.