Canada's Plant Hardiness Site

Asteraceae daisy family
Cirsium pumilum var. hillii (Canby) B.Boivin
En: Hill's thistle, hollowroot thistle;
Fr: chardon de Hill

• [=Carduus hillii (Canby) Porter]
• [=Cirsium hillii (Canby) Fernald]
• [=Cirsium hillii (Canby) Fernald forma albiflorum (Scoggan) E.G.Voss]
• [=Cirsium pumilum (Nutt.) Spreng. forma albiflorum Scoggan]
• [=Cirsium pumilum (Nutt.) Spreng. forma candidum B.Biovin, nom. illeg. hom., non Fernald]
• [=Cirsium pumilum (Nutt.) Spreng. subsp. hillii (Canby) R.J.Moore & Frankton]
• [=Cnicus hillii Canby - basionym]