Flower:

Flowers are in small branching clusters in the upper part of the stem. Individual flowers are about ¼ inch across with 5 narrow pale yellow to greenish (rarely purple) petals and 10 spreading orange-tipped stamens around a relatively large green ovary in the center. Flowers are initially tightly packed in a cluster but spread out as the plant matures.

Leaves and stem:

Leaves are in a basal rosette, each to 9 inches long and 3 inches wide, widest at or above the middle, with a blunt or sharp point at the tip, tapering at the base, on a short reddish stalk. Leaf surfaces are sparsely to densely covered in sticky hairs and the edges may be toothless or have rounded teeth. The stem is thick and also covered in sticky hairs. One plant has a single flowering stem.

Notes:

Swamp Saxifrage formerly went by Saxifraga pensylvanica. Early Saxifrage (Micranthes virginiensis) is a similar species, but with (usually) white flowers and a much smaller stature, only growing to about 10 inches tall. I came upon a group of Swamp Saxifrage, where some of these photos were taken, just as the flowers were blooming. A week later I returned to the spot to see how they were progressing and found every plant had been topped off. Deer must like it.