Swertia caroliniensis (Walter) Kuntze Frasera caroliniensis, commonly known as American columbo or yellow gentian, is a herbaceous perennial of the gentian family Gentianaceae found in the deciduous forest of Southern Ontario and throughout the eastern and southeastern United States.

The flowers that it produces are about 1 inch in diameter and folious (tall and "spike"-like), green to yellow with purple speckles.

[5] Frasera caroliniensis is chiefly known as an occasional substitute for calumba root, or Jateorhiza palmata, a native of Mozambique.

Even more vines and understory trees are associated with this species, such as eastern redbud (Cercis canadensis), strawberry bush (Euonymus americanus), Japanese honeysuckle (Lonicera japonica), Virginia creeper (Parthenocissus quinquefolia) and poison ivy (Toxicodendron radicans).

Herbs associated with the species include the prostrate ticktrefoil (Desmodium rotundifolium), Christmas fern (Polystichum acrostichoides) and ebony spleenwort (Asplenium platyneuron).

Conservation practices to manage these issues include leaving surrounding trees within 4 square metres (43 sq ft), stimulating growth by cutting a small opening in the canopy, and draining overly flooded areas to provide clay-like soil.