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..
Scutellaria serrata Andr. Bot. Rep. pl. 494. 1809. S. laevigata Aiken; Eaton, Man. Ed. 6, 333. 1833.
Perennial, glabrous, or puberulent above; stem slender, erect, simple or branched, 1°-2° high. Leaves ovate or elliptic, slender-petioled, acute at the apex, narrowed, or the lowest rounded or subcordate at the base, crenate or dentate, 2'-4' long, the uppermost reduced to small floral bracts; racemes almost always simple and terminal, loosely flowered, the flowers opposite; fruiting calyx about 3" long; corolla 1' long, blue, minutely puberulent, its tube narrow, gradually expanded above into the throat, its rather narrow upper lip a little shorter than the lower; nutlets borne on a short gynobase.
Scutellaria incana Muhl. Cat. 56. 1813.
Scutellaria canescens Nutt. Gen. 2: 38. 1818.
S. serrata Spreng. Syst. 2: 703. 1825. Not Andr. 1809.
Perennial, finely and densely whitish downy, or the upper surfaces of the leaves glabrous; stem rather strict, erect, usually much branched above, 2°-4° high. Leaves ovate, oval, or oblong, rather firm, slender-petioled, acute at the apex, crenate-dentate, narrowed, rounded or the lower subcordate at the base, 3'-41/2' long; racemes terminal, usually numerous and panicled, several-many-flowered; fruiting calyx 11/2-2' long; corolla 9'-10" long, ca-nescent; upper lip of the corolla slightly longer than the lower; gynobase very short.
la moist woods and thickets, Ontario to Michigan, Kansas, Georgia, Florida and Alabama. June-Aug.
Scutellaria cordifolia Muhl. Cat. 56. 1813. Scutellaria versicolor Nutt. Gen. 2: 38. 1818.
Perennial, densely glandular-pubescent; stem erect, usually stout, 1°-3° high, often simple. Leaves prominently veined, slender-petioled, broadly ovate, crenate-dentate all around, 2'-4' long, all but the uppermost cordate at the base; racemes terminal, narrow, solitary or panicled; bracts ovate, mostly entire, commonly longer than the pedicels; fruiting calyx nearly 3" long; corolla puberulent, io"-I2" long, blue with the lower side lighter or white, its tube narrow, its throat moderately dilated, its lateral lobes about as long as the upper lip; gynobase short.
In woods and thickets, especially along streams, Pennsylvania to Florida, west to Minnesota, Kansas, Arkansas and Texas. Includes several races. June-Aug.