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Spanish needles flowers are 1/2" long and 1/4" across; they occur individually on the end of long peduncles. Each flower has 3-5 (sometimes zero) ovoid, yellow, petal-like ray florets around 12-27 yellow, tubular disc florets, each with five small lobes at their tips, 5 stamens, and a bifurcated style. Even in full bloom, the flowers look like buds. After fertilization, each flower produces needle-like, brown, four-angled, barbed seeds, each 1/2-3/4" long, that radiate in all directions from the base of the old flower.

Bidens

Bidens bipinnata

Spanish needles [Blooms: Aug-Sep]