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Seashore 13 Panicle virgate or thyrsoid; leaves nearly entire 14–17 Heads very small in a short broad panicle; leaves nearly entire 18–20 Heads racemosely paniculate; leaves ample, the lower serrate 21–28 § 1.

Heads small, in a narrow virgate or thyrsoid panicle; scales thin, acute; leaves nearly entire.

Heads middle-sized, in a thyrsoid panicle; involucral scales rather firm, obtuse; leaves entire or little serrate, smooth.

Rays mostly short, white or pale bluish-purple.—Var. thyrsoídeus, Gray, with ovate-oblong to lanceolate leaves, the branches ascending and often short, and the thyrsoid or spicate-glomerate heads less secund.

Like the last; the leaves commonly shorter, firmer, often scabrous, less serrate or entire; involucre more imbricated, the firmer linear scales with shorter acute or obtusish green tips; heads as large, disposed to be thyrsoid or racemose-clustered; rays rarely white.