[++] Calyx-lobes foliaceous.
5. S. calycòsa, Pursh. Diffusely forking, pale, 1° high or less; leaves oblong or lance-oblong, narrowed at base; calyx-lobes spatulate-lanceolate ({2/3}–1´ long), exceeding the rose-colored or almost white corolla.—Sea-coast and near it, Va. to Tex.
[++][++] Calyx-lobes slender and tube very short (prominently costate in n. 6, and longer, nearly or quite enclosing the retuse capsule).
6. S. campéstris, Nutt. Span or two high, divergently branched above; leaves ovate with subcordate clasping base (½–1´ long), on the branches lanceolate; calyx equalling the lilac corolla (1½–2´ broad).—Prairies, S. E. Kan. and W. Mo. to Tex.
7. S. stellàris, Pursh. Loosely branched and forking; leaves oblong to lanceolate, the upper narrowly linear; calyx-lobes awl-shaped-linear, varying from half to nearly the length of the bright rose-purple corolla; style nearly 2-parted.—Salt marshes, Mass. to Fla. Appears to pass into the next; corolla in both at times pink or white.
8. S. grácilis, Salisb. Stem very slender, at length diffusely branched; branches and long peduncles filiform; leaves linear, or the lower lance-linear, the uppermost similar to the setaceous calyx-lobes, which equal the rose-purple corolla; style cleft to the middle.—Brackish marshes, Nantucket, Mass., and N. J., to Fla. and La.
9. S. Ellióttii, Steud. Effusely much branched; leaves small, lower cauline (6´´ long or less) thickish, from obovate to lanceolate, upper narrowly linear and rather longer, on the flowering branches subulate; calyx-lobes slender-subulate, very much shorter than the white corolla; style 2-parted.—Pine barrens, S. Va. (?) to Fla.
[*][*] Corolla 8–12-parted, large (about 2´ broad).
10. S. chloroìdes, Pursh. Stem (1–2° high), loosely panicled above; peduncles slender, 1-flowered; leaves oblong-lanceolate; calyx-lobes linear, half the length of the deep rose-colored (rarely white) corolla.—Borders of brackish ponds, Mass. to Fla. and Ala.
3. EÙSTOMA, Salisb.