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Elephant's heads are found in subalpine and alpine habitats in western mountains from New Mexico to Alaska and throughout Canada, except for Newfoundland and Nova Scotia.

A wildfire's heat and rising plumes of air cause it to create its own weather, and now we appreciate that the big Å·ÃÀ¿Ú±¬ÊÓƵ send aerosols — both particulates and gases — all the way around the world.

Ornate checkered beetles are bright, conspicuous and tolerant of humans, so they are easily found and fun to watch.

My trip was to be three nights long, combining camping and photography, and I longed for clear air and skies for photography of the Milky Way. But I was beleaguered by smoke.I started at the Railroad Bridge Campground on the Arkansas River near

A profound drought has delayed spring in the southwest, and claret cup is one of the first cacti to flower in spring.

Plant communities are usually nicknamed for the most dominant species, such as a ponderosa pine community or a pinyon-juniper woodland. Mat saltbush, also called matscale, communities live on such harsh soils that they are sometimes the only species in in the community. 

The Anthropocene epoch is a unit of geological time in which humans exert a dominant influence on climate and the environment, but we have not reached consensus on its starting point. 

More than 1,500 fossil footprints allow you to follow dinosaurs as they walked along a lakeshore 150 million years ago. The dinosaur tracksite, the largest in North America, is beside the Purgatoire River in Picketwire Canyon south of La Junta. 

On soils containing gold, silky phacelia is protected by gold, cyanide and even some arsenic. On soils devoid of gold, it is protected by cyanide. 

Some species of plant, such as death camas, include toxins in nectar and pollen, presenting a bedeviling paradox. Why attract pollinators and then kill them?