166. Stilpnolepis Krascheninnikov, Bot. Mater. Gerb. Bot. Inst. Komarova Akad. Nauk S.S.S.R. 9: 207. 1946.
百花蒿属 bai hua hao shu
Authors: Zhu Shi, Christopher J. Humphries & Michael G. Gilbert
Elachanthemum Y. Ling & Y. R. Ling.
Herbs, annual. Leaves opposite or alternate, pinnatisect, few lobed or entire. Capitula hemispheric or globose, homogamous, discoid, laxly corymbose or solitary at apex of branches. Involucres hemispheric or cupular-hemispheric; phyllaries in 3-5 rows, herbaceous, margin broadly scarious. Receptacle convex-subconical, epaleate. Florets tubular, bisexual, 5-lobed, with distinct tube and ± crateriform limb. Anther obtuse at base, with apical acuminate-triangular appendage. Style branches linear, apex truncate. Achenes obliquely obovoid to narrowly obovoid-oblanceolate, densely glandular, striate. Pappus absent.
Two species: China, Mongolia; two species in China.
Oberprieler et al. (in Kadereit & C. Jeffrey, Fam. Gen. Vasc. Pl. 8: 349, 357, 364. 2007) accepted Elachanthemum as a distinct genus on the basis of the smooth pollen, which placed it in a different group of genera from Stilpnolepis.