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Ageratum houstonianum Mill.
Family Asteraceae
Ageratum houstonianum Mill. APNI*

Description: Erect or decumbent branched herb, 0.3–1 m high, coarsely hairy or nearly glabrous.

Leaves ovate to triangular, 2–7 cm long, 1.5–6 cm wide, apex acute to obtuse, margins regularly toothed, both surfaces with scattered hairs; petiole 5–30 mm long, hairy.

Corymbs compact; corymb branches 3–8 mm long, ± coarsely hairy; heads ± globose, 6–8 mm diam.; involucral bracts linear-lanceolate, c. 5 mm long, coarsely hairy. Florets blue-mauve.

Achenes c. 2 mm long, black, glabrous or sparsely hairy; pappus of c. 5 white awned scales, 2–3 mm long.


Habit
Photo W. Cherry

Flower
Photo W. Cherry

Herbarium
Sheet

Flowering: most of year, mainly summer.

Distribution and occurrence: Common weed of wasteland; north from Sydney district. Native of Mexico, widespread in C Amer.
NSW subdivisions: *NC, *CC, *SC
Other Australian states: *Qld
AVH map***

Text by M. F. Porteners
Taxon concept: Flora of NSW 3 (1992)


APNI* Provides a link to the Australian Plant Name Index (hosted by the Australian National Botanic Gardens) for comprehensive bibliographic data
***The AVH map option provides a detailed interactive Australia wide distribution map drawn from collections held by all major Australian herbaria participating in the Australian Virtual Herbarium project.
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