Mark Graham

Some of America's best-known roads follow routes forged by Native Americans. Broadway traces a Lenape trail across Manhattan. Parts of Route 66 roughly track older indigenous footpaths. Maryland is no different. A recent state study documents Native paths... See more

A taxonomic revision of herbarium specimens, type material and scanning electron micrographs has reinstated Selaginella brachyclada as a species distinct from S. rhodostachya, resolving a naming problem that dates to the late nineteenth century. The study... See more

In the intricate world of plant taxonomy, where names serve as the fundamental coordinates for scientific communication, a recent proposal has emerged to stabilize a widely used designation for a specific type of grassland vegetation. The name in question... See more

The aye-aye has long been cast as one of nature's most committed loners. The strange-looking lemur, with its skeletal middle finger and rodent-like ever-growing incisors, is classified as a solitary forager, and zoos around the world have traditionally ke... See more

Few questions in science have proved as stubborn as the fate of the world's giant animals. Woolly mammoths, giant ground sloths, saber-toothed cats, moa, and hundreds of other large-bodied species vanished during the late Quaternary, a period spanning rou... See more