Bidens

Bidens cernua

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Bidens tripartita 003

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Bidens biternata W IMG 2942

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Flor blanca (Bidens alba)

Bidens frondosa, 2021-09-15, Bird Park, 02

Bidens is a genus of flowering plants in the Asteraceae family, which is commonly known as the aster, daisy, or sunflower family. The genus is widely distributed throughout the temperate and tropical regions of the world, including North and South America, Africa, Asia, and Europe. Bidens species are known for their small but distinctive flowers, which often feature bright yellow or orange petals. They are commonly referred to as "beggarticks" or "stickseeds" due to their burr-like seeds that easily stick to clothing or fur.

Description

Plants in the Bidens genus vary from annual to perennial and can be herbaceous plants or sometimes shrubs. They typically have opposite leaves that can be simple or pinnately compound. The flowers are usually small, with ray florets that are yellow or orange, and disc florets that can be of the same or different colors. The fruit is a achene, which is often equipped with barbs or hooks, facilitating dispersal by clinging to animals or humans.

Ecology

Bidens species play a significant role in their ecosystems. They are important sources of nectar for a variety of pollinators, including bees, butterflies, and other insects. The plants often grow in disturbed soils, including roadsides, agricultural fields, and floodplains, which makes some species considered as weeds. However, their presence in these areas also contributes to soil stabilization and provides habitats for numerous micro and macro fauna.

Cultivation and Uses

Some Bidens species are cultivated for their ornamental value, appreciated for their bright flowers and ease of growth. They are used in gardens and landscaping to attract pollinators. In addition to their aesthetic appeal, some species have been used in traditional medicine practices for their purported health benefits, which include anti-inflammatory and wound-healing properties.

Species

The Bidens genus comprises over 230 species, including:

• Bidens pilosa – Also known as black-jack, it is widespread in tropical regions and often considered a weed.
• Bidens tripartita – Known as three-lobe beggarticks, it is found in temperate zones and has been used in traditional medicine.
• Bidens ferulifolia – This species is popular in horticulture for its fine foliage and yellow flowers.

Conservation

While many Bidens species are common and not considered at risk, habitat destruction and pollution have led to a decline in some species. Conservation efforts are necessary to preserve the biodiversity within this genus, especially for those species with limited distributions and specific habitat requirements.