Quasipaa acanthophora, or the Mau Son spiny frog, was discovered in 2009 on Mau Son Mountain and has now been reported in a new location, bringing the number of known populations to three ...

Milk thistle (Silybum marianum ... Milk thistles' large, spiny, dark-green leaves have white marbling, which is where the plant gets its common name from, explains Amy Enfield of ScottsMiracle ...

Bull thistle starts out life as a prickly ground-hugging rosette that, in the summer, puts out tall, equally spiny stalks topped with purple flowers. Later, fluffy white seed heads form.

European marsh thistle frequently invades fens, wetlands, and disturbed sites such as roadside ditches. Identifying features include: typically grows 2-7 feet tall leaves are alternate with deeply ...

Canada thistle is a colony-forming perennial from deep and extensive horizontal roots. Stems are 1 to 4 feet tall, ridged, branching above. Leaves are alternate, lacking petioles, oblong or ...

Slender winged thistle has less, with about 1-3 heads per stem. The winged thistle has spiny strips of leaf material up its stems, and these are known as wings, hence the name winged thistle.

As with most thistles, Scotch thistle decreases animal production by reducing the amount of pasture that livestock are prepared to eat as they avoid eating grass beside the spiny leaves, and also the ...