Coefficient of Conservatism:
Coefficient of Wetness:
NORTHERN RAGWORT, BALSAM RAGWORT
Senecio plattensis, Senecio pauperculus
A. A. Reznicek
Senecio pauperculus and S. plattensis of Michigan Flora.
Generally a calciphile of moist sandy or gravelly (limestone) shores, fens, cedar swamps, thin soil over limestone (alvar); also in dry jack pine, aspen, and oak savanna (especially in moist areas); meadows and marshy ground.
Mahoney & Kowal (2008) present evidence that P. plattensis is a tetraploid of prairie habitats found only to the west of Michigan, and recognize the pubescent plants treated as P. plattensis in Michigan Flora as P. paupercula var. pseudotomentosa (Mackenzie & Bush) R. R. Kowal. A collection from Kalamazoo Co. was cited by Mahoney & Kowal (2008) as var. savannarum R. R. Kowal, a prairie-forest border entity forming colonies by shoots produced adventitiously from its roots, rather than rhizomes (the stems thus straight at the base rather than with an arching base from the upturning rhizome). The full distribution of this entity in Michigan is as yet uncertain. R. R. Kowal has annotated specimens occurring, perhaps disjunctly, in prairies in adjacent Essex Co. Ontario as P. pseudaurea (Rydb.) W. A. Weber & Á. Löve var. semicordata (Mack. & Bush) Trock & T. M. Barkley – a species rather like P. paupercula but with rosette leaves cordate or subcordate basally. This should be looked for in Michigan.