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Asteraceae
Eupatorium

not marked as a favorite taxon Eupatorium torreyanum Short & R. Peter. Common name: Torrey's Thoroughwort, Torrey's Eupatorium, Greater Whorled Eupatorium. Phenology: Late Jul-Oct. Habitat: Dry woodlands, powerline rights-of-way, roadsides, marshes. Distribution: New York south to n. peninsular Florida, Panhandle Florida, and west to Ohio, Tennessee, and Louisiana.

Glossary (beta!)

Origin/Endemic status: Endemic

Taxonomy Comments: Cronquist (1980) considers this taxon a "well-marked variety", "probably originated through hybridization between E. hyssopifolium and some other species, but now a stable entity". The other parent is postulated by Sullivan (1978) to be E. semiserratum. For reasons stated in the comments before the species accounts, the taxon is here treated as a species.

Synonymy ⓘ: = K4, NE, NY, POWO, S, Tat, Tn, Va; = Eupatorium hyssopifolium L. var. laciniatum Gray — Ar, C, F, Fl7, FNA21, G, K1, NS, Oh3, SE1, W, WH3; < Eupatorium hyssopifolium L. — Pa, RAB. Basionym: Eupatorium torreyanum Short & R.Peter 1836

Links to other floras: = Eupatorium hyssopifolium var. laciniatum - FNA21

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Heliophily ⓘ: 8

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image #1 of Eupatorium torreyanum© Richard & Teresa Ware CC-BY-NC, permission granted to NCBG | Original Image ⭷
image #2 of Eupatorium torreyanum© Erik Danielson source | Original Image ⭷
image #3 of Eupatorium torreyanum© Gary P. Fleming | Original Image ⭷
image #4 of Eupatorium torreyanum© Gary P. Fleming | Original Image ⭷
image #5 of Eupatorium torreyanum© Bruce A. Sorrie | Original Image ⭷
image #6 of Eupatorium torreyanum© Erik Danielson source | Original Image ⭷

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Horticultural Information

NCBG trait

Intro: Erect perennial of dry woodlands, powerline rights-of-way, roadsides and marshes.

Stems: Stems mostly solitary, branched above, rough-hairy (especially above).

Leaves: Leaves in whorls of 3 or opposite, sessile, lance-shaped, 2-4 1/2 in. long, with 3 prominent veins, with widely spaced teeth on the margins and rough-surfaced.

Inforescence:

Flowers: Composite flowers (heads) arranged in flat-topped clusters at tips of branches; heads white, consisting of several tiny, tubular disk florets with 5-lobed corollas. Several series of tiny, green and white bracts surround the base of each head.

Fruits:

Comments:

Height: 2-4 ft.

plant sale text:

bloom table text:

description: Erect perennial of dry woodlands, powerline rights-of-way, roadsides and marshes.

stems: Stems mostly solitary, branched above, rough-hairy (especially above).

leaves: Leaves in whorls of 3 or opposite, sessile, lance-shaped, 2-4 1/2 in. long, with 3 prominent veins, with widely spaced teeth on the margins and rough-surfaced.

inflorescence:

flowers: Composite flowers (heads) arranged in flat-topped clusters at tips of branches; heads white, consisting of several tiny, tubular disk florets with 5-lobed corollas. Several series of tiny, green and white bracts surround the base of each head.

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