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Ageratum houstonianum

(Blue Billygoat Weed, Dark Bluetop)

FAMILY

Asteraceae

Species

Ageratum houstonianum

Common name(s)

Blue Billygoat Weed, Dark Bluetop

Flower colour; life form

Flowers blue-mauve. Erect or semi-prostrate herb to 1 m tall

Distinguishing features

Leaves opposite at base, later alternate; base of leaves truncate. Flowering heads compact; involucral bracts with coarse hairs, glandular. Florets blue-mauve. Pappus of usually 5 white awned scales.

Ageratum houstonianum