Australian Tropical Rainforest Plants - Online edition

Tridax procumbens L.

Herb (herbaceous or woody, under 1 m tall)
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Flower [not vouchered]. CC-BY J.L. Dowe
Herbarium specimen. © DERM

Linnaeus, C. (1753) Species Plantarum Edn. 1 2: 900. Type: Habitat in vera Cruce.

Common name

Tridax Daisy


Stems decumbent, producing roots at the nodes, up to 50 cm tall. Stems clothed in pale hairs.


Leaf blades 30-60 x 15-35 mm, clothed in hairs, lateral veins 2-3 on each side of the midrib.Petioles hairy, 5-10 mm long.


Flowers produced in heads about 10 x 10-12 mm. Peduncles hairy,11-20 cm long. Heads surrounded by bracts, the outer bracts hairy, each bract about 7 x 4 mm, inner bracts glabrous, 7-8 mm long. Calyx (pappus) consists of barbed or fimbriate hairs 10-12 mm long. Corolla on the ray florets ligular, 9-10 x 4 mm, apex 3-lobed. Corolla of the disk florets tubular, about 5 mm long, corolla lobes about 0.5 mm long. Stamens fused to form a tube. Ovary 2-2.2 x 1 mm, densely clothed in long pale brown or golden hairs.


Achene 1.6-2 mm long; pappus of slender, plumose bristles 5-6 mm long, with fine spreading hairs.


Features not available.

Distribution and Ecology

An introduced species that occurs in WA, NT, CYP, NEQ, CEQ and north-eastern New South Wales. Altitudinal range from near sea level to 915 m.  Found in edges of rainforest also in Eucalypt woodland, grassland and in dune vegetation.

Natural History & Notes

This weedy species has now become widespread throughout the tropics and subtropics.

Contact with this plant can sometimes cause skin irritation (Du Puy et al. 1993)

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