Botanical name: Acmella calva    Family: Asteraceae (Sunflower family)
Synonyms: Spilanthes calva, Spilanthes acmella var. calva

Perennial Toothache Plant is a perennial herb with stems creeping or prostrate, 20-60 cm, hairless, rooting at nodes, sparsely hairy. Leaf-stalks are 5-8 mm, velvet-hairy; leaf blade lanceshaped, 3-7 x 1-3 cm, below nearly hairless or only velvet-hairy along veins, above velvet-hairy, base wedge-shaped, margin peaked sawtoothed, tip tapering or with a tail. Flower-heads are ovoid-conical, 9-11 x 6-8 mm, carried on stalks 3-14 cm. Flower-heads are yellow; ray florets female, about 4 mm, blade short, obovate, tip shallowly 3-lobed; disk florets bisexual, tubular, about 2 mm, 4- or 5-toothed. phyllaries about 8, 2-seriate, nearly equal, green, ovate-oblong, 3-3.5 mm, margin fringed with hairs, tip pointed or blunt; receptacle columnar-conical, 4-8 mm; paleae oblong, boat-shaped, membranous. Achenes are brown, oblong, 1.5-2 mm, velvet-hairy or hairless. Perennial Toothache Plant is found on streamsides, marshes, moist forest margins, fields, at altitudes of 1000-1900 m, in Yunnan, India, Indonesia, Myanmar, Nepal, Philippines, Sri Lanka, Thailand. Flowering: All year.
Medicinal uses: Two to three flower-heads are crushed and mixed in a spoon with honey taken twice a day for 2-3 days, to cure dry cough, in folk medicine in Maharashtra. Flower-heads are also used for curing toothache.

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The flower labeled Perennial Toothache Plant is ...