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.

Lower Taxa

• Stilpnolepis centiflora (Maximowicz) Krascheninnikov
• Stilpnolepis intricata (Franchet) C. Shih