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The following description has been modified from the Flora of North America (2014). Annual, (10–)20–60(–180) cm high. Leaves: petioles 10–40(–60) mm long;blades deltate to lance-ovate overall, 30–80(–150+) × 20–60(–100+) mm long, 3(–5)-foliolate, leaflets petiolulate, lanceolate to lance-ovate, (15–)35–60(–120) long × (5–)10–20(–30) mm across, bases cuneate, margins dentate to serrate, sometimes ciliate, apices acuminate to attenuate, faces glabrous or hirtellous. Heads usually borne singly, sometimes in 2s or 3s or in open, corymbiform arrays. Peduncles 10–40(–80+) mm long. Calyculi (subsidiary circle of small bracts outside the involucral phyllaries) of (5–)8(–10) ascending to spreading, spatulate or oblanceolate to linear, sometimes ± foliaceous bractlets or bracts 5–20(–60) mm, margins usually ciliate, abaxial faces glabrous or hirtellous. Involucres campanulate to hemispheric or broader, 6–9 × 7–12 mm. Phyllaries (bracts surrounding the capitulum) 6–12, oblong or ovate to lance-ovate, 5–9 mm. Ray florets 0 or 1–3+;laminae golden yellow, 2–3.5 mm. Disc florets 20–60(–120+) mm long;corollas ± orange, 2.5–3+ mm. Cypselae (fruits) blackish to brown or stramineous, ± obcompressed, obovate to cuneate, outer 5–7 mm, inner 7–10 mm, margins antrorsely or retrorsely barbed, apices ± truncate to concave, faces usually 1-nerved, sometimes tuberculate, glabrous or sparsely hirtellous;pappi of 2 ± erect to spreading, antrorsely or retrorsely barbed awns 2–5 mm.

Related invasive species

  • Bidens frondosa

Related Farm Practice

  • Flora
Impact

B. frondosa is a herbaceous annual native to North America. It has been introduced widely in Europe and to other parts of the world and is mostly found in temperate climates. The majority of introductions into new countries are intentional, due to the medicinal, herbal and decorative properties ascribed to the species. However, seeds can be accidentally dispersed into new areas as they can adhere firmly to animal fibres such as wool. In Europe B. frondosa has been reported to outcompete and interbreed with native plant species in particular those of the same genus. B. frondosa is classified as an environmental weed in New Zealand.

Has Cabi datasheet ID
108916
Oss tagged
x

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