Description from Flora of China
Tanacetum purpureum Buchanan-Hamilton ex D. Don, Prodr. Fl. Nepal. 181. 1825; Cyathocline lyrata Cassini; C. stricta Candolle; Dichrocephala minutifolia Vaniot.
Herbs, annual, 10-36+ cm tall. Stems erect, often branched from base, branches ascending, reddish purple or red tinged, villous, short-stipitate glandular, more densely so upward. Leaves: basal and lower cauline often deciduous by flowering, petiolate; mid cauline sessile, blade ovate or obovate, 2.5-12 cm, reduced distally, pinnatisect or pinnatifid, abaxially sparsely villous particularly along midvein, stipitate glandular, adaxially sparsely villous or glabrate, sparsely glandular, base expanded auriculate-clasping, segments opposite or oblique, interspersed with triangular lobes along rachis, larger and terminal segments ± lobed, margin spinose-serrate, ± stipitate glandular. Capitula small, numerous or few in often dense terminal corymbiform or corymbiform-paniculiform synflorescences; peduncles densely white villous, ± densely stipitate glandular. Involucre hemispheric, ca. 2 mm in diam.; phyllaries 2- or 3-seriate, subequal, membranous, abaxially sparsely white villous or glabrous, sometimes sparsely glandular (mostly distally), margin hyaline, scarious, ± fimbriate, ciliate, apex acuminate, purple. Marginal female florets purple, tube filiform and short, limb narrowly funnelform, 2-lobed; disk florets 7-11, purple or lobes purple, tube cylindric, 0.6-0.8 mm, limb funnelform, ca. 1.6 mm, lobes triangular. Achenes oblong to fusiform. Fl. and fr. nearly year-round.
Forests, grasslands on slopes, ravines, watersides, roadsides, fields; 100-2000 m. Guangdong, Guangxi, Guizhou, Sichuan, Yunnan [Bangladesh, Bhutan, Cambodia, India, Laos, Myanmar, Nepal, Thailand, Vietnam].