Pteridophytes (including ferns and lycophytes) are one of the oldest groups of plants on Earth, with a fossil record dating back 420 million years. Unlike seed plants, they reproduce by releasing tiny, dust-like spores, so they completely lack flowers, fruits,...

Every year, tens of thousands of new botanical collections make their way into the William and Lynda Steere Herbarium from every corner of the globe. Often arriving pressed between sheets of newspaper from their country of origin, these precious biological...

In the United States, alpine environments located above the trees on mountain peaks provide important habitat for Arctic tundra plants. Unique species grow under extreme conditions within these isolated “islands in the sky” which are rarely found elsewhere south of...