Antennaria corymbosa is a species of flowering plant in the daisy family known by the common name flat-top pussytoes. It is native to parts of northwestern North America from central Canada to California to Colorado, where it grows in moist, cool areas such as mountain meadows and riverbanks. This is a small perennial herb growing from a basal patch of thin, gray, woolly, spoon-shaped leaves one or two centimeters long. It produces several erect stems no more than 15 centimeters tall, each holding an inflorescence of several flower heads. It is dioecious, with male and female plants producing different types of flower heads, which are generally similar in appearance. Each head has a surface of dark-dotted white phyllaries and contains tiny individual flowers. Female flowers yield fruits which are achenes no more than a millimeter long, not counting the soft pappus of 3 or 4 millimeters.