prolific South American aquatic weed having grasslike leaves and short spikes of white flowers; clogs waterways with dense floating masses
South African bulbous wood sorrel with showy yellow flowers
low-growing sticky subshrub of southwestern United States having narrow linear leaves on many slender branches and hundreds of tiny yellow flower heads
either of two amphibious reptiles related to crocodiles but with shorter broader snouts
leather made from alligator's hide
any plant that crowds out cultivated plants
a black band worn by a man (on the arm or hat) as a sign of mourning
clear of weeds
