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..
O. molle Michx. Fl. Bor. Am. 1: 133. 1803.
Stem erect, branched above, about 2° high, hispid-pubescent or strigose, the branches soft-pubescent. Leaves lanceolate to ovate-lanceolate, the larger about 2' long, densely soft-pubescent on both sides; bracts similar to the leaves, 1' long or less; calyx-lobes linear-oblong, 3" long, obtusish; corolla 4"-6" long, its lobes triangular, acute, 1"-1 1/2" long, pubescent outside; nutlets about 1" long, usually distinctly pitted.
Barrens, Kentucky, southern Illinois and Tennessee. May-July.
502. 1905. O. occidentale sylvestre Mackenzie, loc. cit. 504.
1905- Stem l°-31/2° high, branched above or also from the base, strigose or hirsute-pubescent. Leaves lanceolate to ovate-lanceolate, acute, appressed-pubescent on both sides, or the hairs somewhat spreading, 2-3' long, strongly veined; bracts similar to the leaves but much smaller; calyx-lobes lanceolate, acute to obtuse, 3"-6" long; corolla 6"-10" long, canes-cent all over outside, its lobes 1 1/2"-2" long, broadly triangular and acute; nutlets ovoid, acutish, about 2" long, dull, scarcely if at all pitted, not constricted at the base.
On prairies and plains, Illinois to North Dakota, Manitoba, Alberta, Kansas, Texas and New Mexico. Included in O. molle Michx., in our first edition, and by previous authors. May-July.
Onosmodium hispidissimum Mackenzie, Bull. Torr. Club 32: 500. 1905.
Spteading-hirsute with rough bristly hairs; stem stout, usually much branched, 1°-4° high. Leaves lanceolate, ovate-lanceolate or oblong, acute or acuminate at the apex, narrowed to the sessile base, 5-9-ribbed, 2'-4 1/2' long, 1/2'-11/2 wide; flowers very numerous and crowded; pedicels 1"-2" long in fruit; calyx-segments linear, somewhat shorter than the corolla-tube; corolla yellowish-white, pubescent outside, 5"-9.' long, its lobes triangular-lanceolate, acute, one-third to one-half as long as the tube; nutlets obtuse, about 1 1/2" long, distinctly constricted at the base, little if at all pitted.
In dry fields or thickets, or on banks, Ontario and western New York to Minnesota, Missouri, Georgia and Texas. Ascends to 2200 ft. in Virginia. Previously referred to Onosmodium carolinianum (Lam.) DC. May-July.