Sigesbeckia L.
Annual herbs. Lvs opposite, simple, entire to serrate or incised. Capitula pedunculate, solitary or in loose panicles. Involucral bracts in 2 rows; outer row foliaceous, glandular; inner row smaller, partly membranous. Receptacle flat; scales present. Outer florets ♀, shortly ligulate, yellow. Inner florets ⚥, tubular. Achenes all similar, square or triangular in section, narrowed to base, truncate at apex; pappus 0.
9 spp., Africa to Asia, C. and S. America. Naturalised sp. 1.
The generic name is often misspelt Siegesbeckia.
