Botanical name: Ageratum houstonianum Family: Asteraceae (Sunflower family)
Floss Flower is an annual herb, 30-80 cm. Stems are erect to prostrate, sparsely to densely hairy. Leaf blades are triangular to ovate, mostly 3-8 x 2.5-4 cm, margins toothed, lower faces sparsely to densely hairy, not evidently gland-dotted. Flower-cluster-stalks are sticky-finely velvet-hairy, hairy, and stipitate-glandular. Involucres about 4 x 5–6 mm. Phyllaries narrowly lanceshaped, 0.601 mm wide, stipitate-glandular, sparsely to densely hairy, efringed with hairs or inprominently fringed with hairs, tips gradually tapering, indurate-subulate, 0.8–2 mm. Flowers are usually lavender to purple, rarely white. Floss Flower is native to C. America, widely naturalized in India and elsewhere. Flowering: June-October.
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The flower labeled Floss Flower is ...