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Remigum penn� prim� brevi, secund� terti�que longissimis.

Heads very small in slender spreading secund clusters forming a mostly short and broad panicle; leaves entire or nearly so.

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.

States, in swamps.—Var. glandulífera, Gray; a slender form with secund raceme, oval to lance-oblong obtuse gland-toothed leaves, and the bracts and calyx-teeth beset with slender gland-tipped teeth.

Sagit. secund. die plenilunii Marte in Taurum intrato die precedente, & was christened May 17.”