SafePlants

Spanish Needles (Bidens species)

Spanish Needles refer to several plants within the Bidens genus, most commonly Bidens alba and Bidens pilosa. These plants are recognized by various common names, reflecting their widespread presence and distinctive features.

Considerations for Pets

• The seeds of Spanish Needles are described as "needle-like" and clinging. These seeds can attach to fur.

Considerations for Children

• The seeds of Spanish Needles are described as "needle-like" and clinging. These seeds could pose a risk for children who may touch or ingest them.

Scientific Name and Common Names

• Scientific Name: Primarily Bidens alba and Bidens pilosa
• Common Names: Shepherd's needles, beggarticks, Spanish needles, butterfly needles, hairy beggarticks, bur-marigolds, stickseeds, tickseeds, tickseed sunflowers, pitchfork weed, farmer's friend, Black Jack, demon spike grass, needle grass, Cobbler's Pegs, and Romerillo.

Taxonomy and Nomenclature

• Family: Asteraceae (aster/daisy family)
• Synonyms: Bidens pilosa (syn) is listed as a synonym for one of the species.

Distribution and Habitat

• Native to the Americas.
• Widely distributed in tropical and subtropical areas.
• Considered a weed in North America but also cultivated in many tropical areas.

Ecological Role

• Regarded as an aggressive weed.
• Seeds cling easily, aiding in dispersal.
• An important nectar source for butterflies and bees in Florida.

Morphological Characteristics

• Summer annual, growing to about 2-5 feet tall.
• Described as bushy.
• White and yellow flowers.
• Produces needle-like seeds that cling to surfaces.

Quirky Facts

• 1000 Biden seeds weigh less than a gram.

Interactions with Other Organisms

• Flowers are a significant nectar source for butterflies and bees.