Common St. Paul's wort

<em>Sigesbeckia orientalis</em>, known as common St. Paul's wort, is an annual herbaceous plant in the family Asteraceae, order Asterales. It has a pantropical and subtropical distribution, naturally occurring across Asia, Africa, and Australia, and has become naturalized in parts of the Americas and Pacific islands. The species typically grows in disturbed habitats, agricultural margins, forest clearings, and roadsides, thriving in humid, warm climates with moist soils. <em>Sigesbeckia orientalis</em> bears small yellow composite flower heads and is characterized by sticky, glandular bracts that aid in seed dispersal by adhering to passing animals and clothing. The plant has a history of use in traditional medicine across much of Asia, particularly for anti-inflammatory and analgesic applications, with various active compounds including sigesbeckic acid identified in the literature. Biological traits including precise lifespan, average height under natural conditions, and specific herbivore associations remain poorly documented. The species has not been formally assessed by the IUCN but is generally regarded as widespread and common, with no known significant threats to global populations.