While many tumbleweed species exist, the Russian thistle (Salsola tragus) is the best known. Bright green and succulent when growing, it develops reddish or purple shoots and green flowers surrounded ...
A strong competitor for light, moisture and nutrients, Canada thistle can cause greater crop losses than any other broadleaf weed in Western Canada. A perennial, it reproduces with seed and freely ...
Today, the U.S. Fish and Wildlife Service proposed listing the monarch butterfly as a threatened species under the Endangered Species Act. If approved next year, the monarch would become one of ...