FLOWERS & FUNGI
Below are flowers and fungi I've spotted on various hikes.
Lady's slipper, also called moccasin flower: found in central and eastern Canada and across the north central and northeastern U.S. New England lists this plant as of "special concern," due to its rarity under the Native Plant Protection Act. Photograph on the left was taken in Rhode Island. Although the Appalachian Trail doesn't go through RI, lady's slippers can be found on the trail in the Northeast.
Crossvine or Trumpet Flower, grows in the southern part of the U.S. Flowers in mid spring to late summer. The vines can grow to fifty feet tall. Flowers are pollinated by ants and hummingbirds. Photograph on the left was taken while I was visiting Tennessee.
Bull Thistle, also known as Boar Thistle, Common Thistle, Dodder, and Spear Thistle. This plant is scattered throughout the United States. It attracts bees and butterflies and blooms from summer through the fall. The photograph on the left was taken on the AT on Bear Mountain, in Orange County, NY.  
Gray Goldenrod, found throughout the United States. It's often found in fields and other open areas.  This photo was taken on the AT in New York.