WordNet (r) 3.0 (2006):

Hymenoxys acaulis
    n 1: perennial having tufted basal leaves and short leafless
         stalks each bearing a solitary yellow flower head; dry
         hillsides and plains of west central North America [syn:
         stemless hymenoxys, Tetraneuris acaulis, Hymenoxys
         acaulis]