The Mt. Cuba Center is entrusted with maintaining a variety of Trillium species, and you almost have to buy their handy book if you want to identify them all out in the gardens. Trillium grandiflorum, was probably one of the most abundant one used in the gardens, though I think T. flexipes is found in more of their gardens and is a little bit more successfully grown.
Trillium grandiflorum 'good pink' is a form that is solid pink right when it opens.
Trillium pusillum. which is only a few inches high.
Nodding Trillium, Trillium cernuum, has pollen that's almost blue in color. There's also just a kiss of red on the stigma. Normally the flower is bending down under the leaves to almost face the ground but these were mostly all up and showy.
Trillium cernuum, and wonder well what if they get this color and lose the others they normally have. I'm leaning toward it being T. simile just past it's prime, but only because the top flower petal being slightly bigger is something I see more in that species than other, but I can't really rule out T. flexipes because I don't know how soon their seed pod gains color.
This appears to be a faded Red Trillium, Trillium erectum.
Bog Rosemary, Andromeda polifolia, and Swamp Pink, Helonias bullata, growing along a pond.
Swamp Pink, Helonias bullata, is always showy to see in person. Sadly this is a threatened species, and my understanding is that the deer treat this like cotton candy in the wild. Their seeds need the perfect amount of cold hours to germinate too. One week too much or not enough and they won't grow at all.