Eupatorium cordigerum (Fernald) Fernald. Common name: Clasping Roundleaf Eupatorium. Phenology: Jul-Aug. Habitat: Woodlands. Distribution: VA, NC, and SC west to AR and MS.
Origin/Endemic status: Endemic
Taxonomy Comments: This taxon is a considered to be an apomictic, polyploid derivative of the hybrid E. perfoliatum × rotundifolium. Cronquist (1991) describes it as "possibly not long-persistent, but frequently created when propinquity permits". It is unclear that it can be consistently and reliably distinguished morphologically from robust plants of Eupatorium rotundifolium.
Synonymy ⓘ: = F, Va; = Eupatorium ×cordigerum (Fernald) Fernald — Ar, FNA21, K4; = Eupatorium rotundifolium L. var. cordigerum Fernald — C, SE1, Cronquist (1985); < Eupatorium pubescens Muhl. ex Willd. — S; < Eupatorium rotundifolium L. — GW2; < Eupatorium rotundifolium L. ssp. ovatum (Bigelow) Montgom. & Fairbrothers — Montgomery & Fairbrothers (1970); < Eupatorium rotundifolium L. var. ovatum (Bigelow) Torr. — G, RAB; < Eupatorium scabridum Elliott — Tn. Basionym: Eupatorium rotundifolium L. var. cordigerum Fernald 1943
Links to other floras: = Eupatorium ×cordigerum - FNA21
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Wetland Indicator Status:
- Atlantic and Gulf Coastal Plain: FAC
- Eastern Mountains and Piedmont: FAC
Heliophily ⓘ: 7
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