Manual of the New Zealand Flora.
14. Siegesbeckia, Linn
14. Siegesbeckia, Linn.
Glandular-pubescent herbs with opposite leaves. Heads rather small, in leafy panicles, heterogamous, subradiate. Involucre campanulate or hemispherical; bracts few, in about 2 rows, herbaceous, glandular-hispid; the outer spathulate, spreading; inner erect, concave, enclosing the ray-florets. Receptacle small, paleaceous; scales membranous, concave, often enclosing the florets. Ray-florets in 1 series, female, tube short, limb 2–3-fid, Discflorets hermaphrodite, tubular with a campanulate 5-toothed mouth. Anthers entire at the base. Style-branches of the hermaphrodite florets short, flattened, usually obtuse. Achenes obovoid-oblong, not compressed, usually curved. Pappus wanting.
Species probably not more than 2, the one found in New Zealand an almost cosmopolitan weed in warm climates, the other confined to Peru.