Eupatorium petaloideum
Distinguishing Features: involucral bracts are acuminate and white in color but almost completely lack glands, and glands are relatively sparse to lacking on leaves.
Habitat: upland, well drained sites in loamy soil, scrub/oak long-leaf pinewoods or oak-hickory communities.
Geographic Distribution : narrowly distributed in Florida and southern Georgia, extending to Alabama and Mississippi
Similar Species: Eupatorium album is very similar, but differs in having involucral bracts with conspicuous glands, as well as larger and generally fewer stem leaves. The comparison is clear in the isolectotype sheet of E. petaloideum, in which the type specimen on the left is mounted together with a typical plant of E. album on the right (click on type below to go to New York Botanical Garden site with the image).
TypeMolecular Data : samples of E. petaloideum (DNA #s 2000, 2390, 2391) differ in ITS sequence from all other species by a minimum of 7 bp changes and 1 indel (compared to E. album). (see slide 2 for another view of the indel.)
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