About Cotula australis (Sieber ex Spreng.) Hook.fil.
Cotula australis (Sieber ex Spreng.) Hook.fil. is a plant species belonging to the daisy family. It has several common names: bachelor's buttons, annual buttonweed, southern waterbuttons, and Australian waterbuttons. This small plant is native to Australia and New Zealand, but it is a widespread common weed in other regions across the globe, including South America, California, Mexico, and South Africa. It grows low to the ground, forming a thin mat, with some slightly erect, spindly stems. Its leaves are repeatedly divided into fringelike lobes. The plant produces flower inflorescences that are only a few millimeters wide. These inflorescences hold tiny yellow disc florets, surrounded by greenish brown bracts. The ray florets of this species are rudimentary, reduced to only pistils with no stamens or corolla. The fruit produced is a tiny winged achene that is roughly one millimeter wide.
