Antennaria is a genus of about 45 species of herbaceous perennial plants in the family Asteraceae, native to temperate regions of the Northern Hemisphere, with one species (A. chilensis) in temperate southern South America; the highest species diversity is in North America. Common names include catsfoot or cat's-foot, pussytoes and pearly everlasting.
Different Antennaria species reach between 10 cm and 50 cm in height. The leaves are basal and often stem leaves. The name Antennaria refers to the projecting stamens seen on the flowers of some species, resembling insect antennae.
Antennaria species are used as food plants by the larvae of some Lepidopteran species including Coleophora pappiferella (which feeds exclusively on A. dioica) and Schinia verna (which feeds exclusively on Antennaria spp).
This species is a nice colony former that grows in high shade understories, often on dry slopes in our area. The variety 'ambigua' (some taxonomists have made it the species epithet) refers to a leaf top surface that is green and glabrous (free of pubescence).