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Seeds few in each cell, obovoid, with a thin white aril.—Stems rather low, terete, from a short rootstock with fleshy roots, naked or scaly at base, forking above, bearing oblong perfoliate flat and membranaceous leaves with smooth margins, and yellowish drooping flowers, in spring, solitary on terminal peduncles.

Perigynium obconic or obovoid, squarrose in exceedingly dense short spikes.—Sp.

A. undulàtus, L. Pale or somewhat hoary with close pubescence; stem spreading, bearing numerous heads in racemose panicles; leaves ovate or ovate-lanceolate, with wavy or slightly toothed margins, roughish above, downy underneath, the lowest heart-shaped on margined petioles, the others abruptly contracted into short broadly winged petioles which are dilated and clasping at the base, or directly sessile by a heart-shaped base; involucre obovoid, the scales less rigid.—Dry copses; common.

Achenes obovoid, with a small summit and no pappus.—Herbs or shrubby plants, bitter and aromatic, with small commonly nodding heads in panicled spikes or racemes; flowering in summer.

Culms very stout, rigid; achene more broadly obovoid.