antennaria: small woolly perennial herbs having small whitish discoid flowers surrounded by a ring of club-shaped bristles
genus: (biology) taxonomic group containing one or more species
sodium: a silvery soft waxy metallic element of the alkali metal group; occurs abundantly in natural compounds (especially in salt water); burns with a yellow flame and reacts violently in water; occurs in sea water and in the mineral halite (rock salt)