Bidens pilosa
# 08 Black Jack
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Genus: Bidens
Species: B. pilosa
Scientific name: Bidens pilosa
Common names: Bidens, Black-jack, Bur marigold, Cobbler's pegs, Spanish needle, etc.
Habit: Bidens pilosa is an annual herb that can grow up to 1.5 meters tall. It is known for its sharp, needle-like seeds that can stick to clothing and animal fur.
Root: Bidens pilosa has a fibrous root system that is shallow and spreading.
Stem: The stem of Bidens pilosa is green, ridged, and can be either erect or sprawling depending on the growing conditions.
Leaf: The leaves of Bidens pilosa are opposite, pinnately compound, and can be up to 12 cm long. They are dark green and have serrated margins.
Flower: The flowers of Bidens pilosa are small and yellow. They are arranged in solitary heads, with each head having 5-10 ray flowers and numerous disk flowers.
Calyx: The calyx of Bidens pilosa flowers is composed of bracts that surround the base of the flower head.
Corolla: The corolla of Bidens pilosa flowers is composed of yellow petals that are fused together to form a tube.
Androecium: The androecium of Bidens pilosa flowers consists of five stamens with long filaments that extend beyond the corolla tube.
Gynoecium: The gynoecium of Bidens pilosa flowers consists of two fused carpels that form an inferior ovary with two locules. Each locule contains one ovule.
Floral formula: The floral formula for Bidens pilosa can be represented as follows:
K (0) C (5) A (5) G (2)
Fruit: The fruit of Bidens pilosa is a small, dark brown achene with two barbed awns that help it to disperse by attaching to fur or clothing. The achenes are edible and have been used as a food source in some cultures.
Caring: Bidens pilosa is an annual plant that is easy to grow and requires minimal care. It prefers full sun to partial shade and well-draining soil. It can tolerate drought but prefers regular watering. It can be propagated by seeds or stem cuttings.
Significance: Bidens pilosa is used in traditional medicine to treat a variety of ailments, including malaria, diarrhea, and respiratory infections. It has also been studied for its potential anti-inflammatory, antioxidant, and antimicrobial properties. In some cultures, the leaves and stems of the plant are eaten as a vegetable.
Economical importance: Bidens pilosa has a few economical importance. It is considered a weed in many parts of the world, and its barbed awns can cause problems for livestock by attaching to their fur or clothing. However, it is also used in some cultures as a traditional medicine and as a food source. Additionally, the plant has potential uses in the pharmaceutical and cosmetic industries due to its reported medicinal and antioxidant properties.
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