5. P. léptodon, Gray. Soft-pubescent, or glabrate below, loosely branched; leaves membranaceous, green (1½–2´ long), lanceolate or oblong-lanceolate, subsessile; clusters larger and looser, canescent-hirsute; long-acuminate bracts and calyx-teeth slender-subulate, villous-hirsute.—S. Mo. to northwestern N. C.
[+][+][+] Leaves linear- or oblong-lanceolate, short-petioled, not at all hoary; flowers in mostly terminal dense capitate clusters; calyx hoary-pubescent.
6. P. Torrèyi, Benth. Puberulent; stem strict and nearly simple (2–3° high); leaves thin, linear-lanceolate, tapering to both ends (mostly 2´ long and 2–3´´ wide), nearly entire; heads small; awl-shaped calyx-teeth and mostly appressed bracts canescent.—Dry soil, southern N. Y. to Penn. and Del.
7. P. clinopodioìdes, Gray. Pubescent; leaves broadly or oblong-lanceolate, sharply denticulate (sometimes entire); heads fewer and larger; bracts loose.—Dry soil, southern N. Y. to E. Penn.
[*][*][*] Calyx bilabiate (3 upper teeth united), the teeth and the tips of the loose bracts not rigid; flowers in dense flattened glomerate cymes; leaves thin, mostly serrate, petioled, the uppermost more or less canescent.
8. P. Túllia, Benth. Leaves greener and loosely soft-downy, only the floral ones whitened, otherwise resembling those of the next; cymes dense; bracts much surpassing the flowers, their long awn-like points and the awn-pointed calyx-teeth bearded with long loose hairs.—S. Va. and N. C. to Tenn. and Ga.
9. P. incànum, Michx. Leaves ovate-oblong, acute, remotely toothed, downy above and mostly hoary with whitish wool underneath, the uppermost whitened both sides; cymes open; bracts linear-awl-shaped and, with the calyx-teeth, more or less awn-pointed.—N. Eng. to Ont. and Ind., south to Fla. and Tex.
[*][*][*][*] Calyx equally 5-toothed; heads few, large and globose (terminal and in the upper axils of the thin petioled leaves); bracts loose, ciliate-bearded.
10. P. montànum, Michx. Stem (1–3° high) and ovate- or oblong-lanceolate serrate leaves glabrous; bracts very acute or awl-pointed, the outermost ovate and leaf-like, the inner linear; teeth of the tubular calyx short and acute.—Alleghanies, from S. Va. and Tenn. to Ga. and Ala.