Key to Wisconsin Malvaceae
- 1a.Calyx lacking subtending bractlets; stipules shed early C.digtiata
- 1b.Calyx with 3 subtending bractlets; stipules persistent 2
- 2a.Leaf blades deeply palmately-lobed with 3–5 lobes, their margins further deeply toothed or lobed; adaxial leaf blade surfaces covered in simple hairs; bractlets linear to narrowly ovate C. involucrata
- 2b.Leaf blades triangular to ovate-lanceolate, unlobed or shallowly 3–5 lobed; adaxial leaf blade surfaces covered in stellate hairs; bractlets narrowly ovate to spatulate C.triangulata
Callirhoë alcaeoides (Michx.) A. Gray was collected in 1888 from Bayview, a neighborhood in Milwaukee. The specimen lacks any habitat data, but this area was experiencing heavy rail traffic during this time and the species could have conceivably been introduced that way; it may also have been taken from a garden.