Annuals (fragrant), 30–100 cm; fibrous-rooted (roots relatively thick and lignescent). Stems greenish, glandular-villous (without persistent tomentum, stipitate glands mostly 0.3–1 mm, often variable, stalks broadened toward bases, about equaling gland widths). Leaf blades mostly oblong-lanceolate, 2.5–7 cm × 4–20 mm, bases not clasping, not decurrent, margins flat, faces bicolor, abaxial white to gray with lightly persistent tomentum, adaxial green, both minutely stipitate-glandular. Heads in corymbiform arrays. Involucres campanulate, 6–7 mm. Phyllaries in 4–6 series, white (opaque, shiny), ovate to ovate-oblong or oblong, ± tomentose. Pistillate florets 83–107. Bisexual florets 9–15. Cypselae ridged, smooth.
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