Morphological characteristics
Herbs, annual or biennial, 60-100cm tall. Stems erect, 4-angled, covered with hairs. Leaves opposite; leaf many; petiole length 0.5-8cm. The basal leaves of the annual plant are long-stemmed, their leaves are slightly rounded, 4-8cm in diam., 5-9-lobed, lobes with 2-3 blunt teeth, base cordate; middle stems shortly stalked, 3-lobed, lobes. Close to lanceolate, central lobes often again 3-lobed, two lobes further 1-2 fissure, the final piece width is usually more than 3mm, tip acuminate, margin sparsely serrate or nearly entire; uppermost lobe not divided, linear, Nearly sessile, green above, strigose, pale green below, puberulous and glandular. Umbrella inflorescences axillary, with 8-15 flowers; bracteate acupuncture, acyclic; calyx bell-shaped, adaxially puberulent, apex 5-toothed, spiky, below 2 to 2 teeth above , persistent; corolla lip, pale red or purple, long 9-12mm, outside pubescent, upper lip and lower lip equal, upper lip oblong, entire, margin ciliate, lower lip 3-lobed, central The lobes are large, inverted heart-shaped; stamens 4, two strong, inserted near the middle of the corolla, filaments sparsely scaly hair, anthers 2-loculed; pistil 1, ovary 4-lobed, style filamentous, slightly longer than stamens, stigma 2 cracks. Small nuts brown, triangular, apex wide and truncated, base wedge-shaped, length 2-2.5mm, diameter of about 1.5mm. Flowering from June to September, fruiting period from July to October.
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