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 pilosa Michx. Fl. Bor. Am. 2: 11. 1803. Scutellaria ovalifolia Pers. Syn. 2: 136. 1807. S. hirsuta Short, Transyl. Journ. Med. 8: 582. 1836. Scutellaria pilosa hirsuta A. Gray, Syn. Fl. 2: Part 1, 379. 1878.
Perennial, stem slender, simple or branched, hairy or downy below, sometimes hirsute, glandular-pubescent above, 1°-3° high. Leaves ovate, oval, or oblong, petioled, obtuse, or the upper subacute at the apex, crenate, 1'-3' long, narrowed or rounded at the base or the lower sub-cordate; racemes terminal, solitary or panicled, sometimes also in the upper axils; bracts oblong or spatulate, entire, longer than the pedicels; fruiting calyx about 3" long; corolla blue,6"-8" long, minutely puberulent or glabrous, its lower lip and lateral lobes somewhat shorter than the arched upper one; gynobase short.
Scutellaria integrifolia L. Sp. Pl. 599. 1753. Scutellaria hyssopifolia L. Sp. Pl. 599. 1753.
Perennial, hoary with a minute down; stem slender, erect, rather strict, simple or branched, 6'-2 1/2° high. Leaves thin, linear to oblong, petioled, or the upper sessile, obtuse at the apex, entire, 1'-2' long, 2"-6" wide, or the lower ovate, lanceolate or nearly orbicular, obtuse and sometimes subcordate at the base, often crenate-dentate or incised; racemes solitary or several, terminal; bracts linear-oblong, subacute, longer than the pedicels; fruiting calyx 2"-3" long; corolla blue, or whitish underneath, 10"-15" long, its large lips nearly equal; gynobase short.
In fields, woods and thickets, Massachusetts to West Virginia, Tennessee, Arkansas, Florida, Louisiana and Texas. Consists of several races. May-Aug. Large-flowered scullcap.
S. resinosa Torr. Ann. Lye. N. Y. 2: 232. 1827.
Perennial from a thick woody root, minutely canescent or puberulent and usually resiniferous; stems rather slender, rigid, tufted, leafy, ascending, 6'-10' high. Leaves ovate, oval, or oblong, sessile, or the lower short-petioled, entire, obtuse at the apex, mostly narrowed at the base, 3"-6" long; flowers solitary in the axils; fruiting calyx nearly 3" long; corolla violet or nearly white, very pubescent, 6"-8" long, its tube narrow and lips nearly equal; gynobase short.
On dry plains, Nebraska and Kansas to Texas and Arizona. May-Aug.