Here's another flower that blooms in the fall.
Bottle Gentian or Closed Gentian (Gentiana andrewsii) is found in moist meadows in the southern half of Pennsylvania. I usually find it near the lake at Moraine State Park. This one is from Marcy Cunkelman's garden last month.
The flower is fascinating because it's closed so tightly that small insects can't get inside. Only bumblebees can force their way in to sip the nectar.
Occasionally an insect will bypass the closed tips by drilling straight into the base of the flower. Alas. This mars its intense blue petals.
(photo by Marcy Cunkelman)