Thistles are flowering plants in the Asteraceae family with sharp ... This is a unique adaptation that protects thistle plants from hungry, plant-eating animals. Many thistle plants look alike ...

though it isn't a thistle or a cactus at all and is instead part of the Amaranth family. This plant is an icon of the Old West, featured in movies, song lyrics and more, however, its representation in ...

As with many members of the Asteraceae family, it starts life as a rosette ... The lobes in each leaf of prickly sow thistle do not tend to cut in so close to the midrib of the plant as in sow thistle ...

European marsh thistle, a terrestrial and wetland herbaceous biennial in the Asteraceae family, is an invasive plant that prefers moist soils. European marsh thistle frequently invades fens, wetlands, ...

The Sacramento Mountains thistle is a rare purple flower than can grow to be six feet tall and lives only in wet, high-elevation habitats in the Sacramento Mountains near the town of Cloudcroft, New ...

The Sacramento Mountains thistle is a rare purple flower than can grow to be six feet tall and lives only in wet, high-elevation habitats in the Sacramento Mountains near the town of Cloudcroft, New ...

Canada thistle, a terrestrial herbaceous perennial in the Asteraceae family, is an open-land invasive that prefers disturbed upland areas ... annually hand pull or dig rosettes and adult plants, dry ...