Buchnera americana, commonly known as American bluehearts or bupleurum, is a locally endangered herbaceous perennial plant of the broomrape family Orobanchaceae.

[1] Buchnera americana is mostly found along the edges of wet depressions, in limestone glades, prairies, moist sandy soils, and open woods.

In Canada, Buchnera americana is only found in "a 10 km (6.2 mi) stretch of the shoreline of Lake Huron in South-western Ontario".

[1] In Ontario their natural interdunal habitats are threatened by development for housing, cottages and recreational areas, such as parks where the flowers are stepped on or picked.

[1] Since burning needs to occur in a rotational 3–4 year cycle in Indiana, Illinois, Missouri and Ohio, Bluehearts are greatly affected by habitat loss in these areas of the United States.

During stressful conditions (such as drought), bluehearts may heighten their parasitic effects to the point where a large group of them may damage small trees.