Centipeda

Centipeda is a genus of plants in the family Asteraceae, commonly known as sneezeweeds or carpet weed. These are small, annual herbs found in Australia, New Zealand, and parts of Asia. They typically grow low to the ground, forming dense mats. The leaves are usually small and somewhat fleshy, often arranged alternately along the stem. The flowers are small and inconspicuous, typically greenish or yellowish, and grouped into dense, button-like heads. These flower heads are characteristic of the Asteraceae family, with tiny ray florets and disc florets.

Species within the Centipeda genus are often found in damp or seasonally wet areas, such as salt marshes, swamps, and along the edges of water bodies. Their ability to tolerate saline conditions makes them important components of coastal vegetation. Some species are considered weeds in agricultural settings, particularly in pastures or low-lying areas prone to waterlogging. Despite their small size, they can reproduce prolifically, spreading by seed. The common name "sneezeweed" is likely due to the pollen released by these plants, which can cause allergic reactions in some individuals. The genus name Centipeda itself is derived from Latin, meaning "hundred feet," possibly referring to the plant's creeping growth habit or numerous small flowers.