Herbs 40-140 cm tall, annual. Stem glabrous, leafless, with a single leaf, or with very few leaves. Basal leaves with petiole 4-17 cm, unwinged; leaf blade mostly triangular to triangular-ovate, 6-13 × 5-10 cm, undivided, base cordate, hastate, or sagittate, margin entire or sinuate and remotely unequally mucronulately dentate; leaf blade more rarely lyrately pinnatisect with 1 pair of small ovate lateral lobes. Stem leaves if any triangular-hastate, undivided, otherwise like basal leaves. Synflorescence corymbiform to corymbosely paniculiform, with few to many capitula. Capitula with usually 6-10 florets. Involucres cylindric, 10-13 × 2-3 mm. Phyllaries glabrous, apex acute; outer phyllaries triangular-ovate to lanceolate, largest 5-7 × 1-2 mm; inner phyllaries 5(or 6). Florets purplish red. Achene ca. 6 mm, contracted into a ca. 1 mm beak. Pappus 6-7 mm. Fl. and fr. Oct.
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