Eupatorium resinosum
pine barren boneset

Eupatorium resinosum

Eupatorium resinosum
Eupatorium resinosum
Photos, Renee Brecht
Britton & Brown
Botanical name: Eupatorium resinosum Torr. ex DC.
Common name: pine barren boneset
Group: dicot
Family: Asteraceae
Growth type: forb/herb
Duration: perennial
Origin: native
Plant height: 1-3'
Foliage: sticky-hairy (resinosum); leaves narrowly oval, 2-5", narrowly pointed toothed, leaves clasping but not fused
Flower: white, flat topped panicles; heads 1/8"-1/4", flowers 9-14.
Flowering time: July to October
Habitat: swamps and wet bogs of the Pine Barrens
Range in New Jersey: southern portion of the state
Heritage ranking, if any: State Endangered, G3, S2, CMP
Misc. Stone, in 1910, says "This is a species which does not associate with the other white Bonesets, unless it be with E. leucolepis. It is strictly a Pine Barrrens species frequenting the great natural bogs in the heart of the region where grow Xyris congdoni, X. fimbriata, Eriocaulon decangulare, Gyrostachys praecox, Helianthus angustifolius, Lobelia canbyi, etc., and is not known to occur outside of New Jersey. At Manahawkin, where the Pine Barren swamps come well out to the coast and the range of this species meets that of E. perfoliatum, Mr. Bayard Long has discovered an interesting hybrid between the two" p. 737

E. resinosum is profiled by the CPC National Collection of Endangered Plants and is currently found in New Jersey, then disjunct to the Carolinas. It is rare throughout its range. It has been extirpated from Delaware and New York.

E. resinosum can be distinguished from E. perfoliatum  by the leaves, which are clasping the base but not fused in resinosum, but broadly based and fused around the stem in perfoliatum. Leaves are also much narrower on resinosum.