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..
Annual, puberulant or glabrate, branched from the base, the branches very slender, erect or ascending, 5'-12' high. Lower and basal leaves petioled, 1'-2' long, pinnatifid or pinnately divided into 3-5 oblong obtuse entire or dentate segments, or rarely merely dentate, or even entire; upper leaves much smaller, sessile, less divided; flowers light blue or white, racemose, 4"- 5" broad; racemes 5-15-flowered, elongated in fruit; pedicels 3"-7" long; calyx-lobes oblong or oblong-lanceolate; corolla rotate-campanulate, the appendages obsolete; filaments pubescent; anthers slightly exserted; ovules 4-8 on each placenta; capsule globose, 1 1/2" in diameter, 6-12-seeded; fruiting pedicels ascending.
In moist soil, New York and Pennsylvania to Georgia, Missouri, Kansas and Texas. Ascends to 2000 ft. in Virginia. April-June.
Phacelia hirsuta Nutt. Trans. Am. Phil. Soc. (II.)
Acad. 10: 321. 1875.
Similar to the preceding species but usually stouter and larger, hirsute-pubescent. Leaves petioled, pinnatifid or deeply pinnately divided into 5-9 oblong obtuse usually entire segments, or the upper 3-5- lobed or entire, sessile; racemes rather dense, scorpioid when unfolding; flowers blue, 6"-7" broad; calyx-segments oblong-lanceolate, hirsute; corolla rotate-campanulate, its appendages short; ovules 3-4 on each placenta; stamens scarcely exserted; capsule globose, 4-8-seeded.
In dry soil, Virginia to Georgia, west to Missouri, Kansas and Texas. April-June.
Phacelia Covillei S. Wats, in A. Gray, Man. Ed. 6, 360. 1890.
Annual, similar to the two preceding species, branched from the base, pubescent; branches very slender, weak, 6'-12' long. Leaves deeply pinnatifid or pinnately divided into 3-7 oblong or obovate, obtuse segments; racemes only 1-5-flowered; pedicels filiform, 6"-8" long; calyx-segments linear, elongating in fruit; corolla tubular-campanulate, about 3" long and broad when expanded; filaments glabrous; anthers not exserted; appendages of the corolla obsolete; capsule globose, 1 1/2"-2" in diameter; fruiting pedicels recurved.
Along the Potomac River above Washington, D. C., and in Illinois. April-May.
Phacelia Purshii Buckl. Am. Journ. Sci. 45: 171. 1843.
Annual, pubescent; stem erect, usually much branched, 6'-18' high. Lower and basal leaves petioled, 1 1/2'- 3' long, pinnately parted or pinnatifid into 9-15 oblong or lanceolate, acute or obtusish, entire or sometimes incised segments; upper leaves sessile, with fewer segments; racemes strongly 1-sided, 10-20-flowered, much elongated in fruit; pedicels 3"-12" long; calyx-segments lanceolate or linear-lanceolate; corolla 5"-6" broad, blue or white, nearly rotate, not appendaged within, its lobes fimbriate; filaments slightly exceeding the corolla; ovules 2 on each placenta; capsule globose-ovoid.
In moist woods or thickets, Pennsylvania to Minnesota, south to North Carolina, Alabama and Missouri. Ascends to 2000 ft. in Virginia. April-June.
Phacelia fimbriata Michx. Fl. Bor. Am. 1: 134. 1803.
Annual, sparingly pubescent; stems simple or branched, ascending or diffuse, 6'-2o' long. Basal and lower leaves slender-petioled, 2'- 4' long, pin-nately divided into 5-9 orbicular obovate or oblong obtuse dentate or entire segments; upper leaves sessile, their segments oblong or lanceolate, acute; clusters loose, 3-12-flowered; pedicels 4"-15" long; flowers 4"-5" broad, white; calyx-segments linear to spatulate, obtuse; corolla rotate-campanulate, not appendaged within, its lobes strongly fimbriate; filaments pilose, about equalling the corolla; ovules 2 on each placenta; capsule depressed-globose, 2" in diameter.
In woods, mountains of Virginia to Alabama. May-June.