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Involucral leaves few, mostly larger than the entire or bidentate stem-leaves.

Leaves bidentate or bilobed, rarely 3-lobed.

Minute, blackish; stems creeping, strongly rooting, subsimple; leaves clasping, semi-vertical, closely imbricate, ovate-quadrate, concave, obtusely bidentate with an obtuse sinus, or acute in the upper leaves; involucral leaves larger, erect, connate at base, 3-toothed, wavy-plicate; perianth oval-cylindric, plicate and subdentate, pellucid, reddish below.—On coarse sand in the White Mts.

Ascending; leaves subcomplicate, entire, the lower lobe ovate, acute or bidentate, concave, the upper small and tooth-like; involucral leaves 3–5-cleft; perianth oblong, obtuse, plicate.

Leaves succubous, bidentate; underleaves 2-cleft, with linear divisions.