Jennifer & Scott discuss:
>> I am wondering if Rubia tinctoria L. and Rubia tinctorum (L.) are the
>> same species or if they're actually two different species?
>>Kartesz' 1994 Checklist only includes Rubia tinctoria L. for North America. Rubia
>brownei, R. peregrina, R. walteri are all now considered Galium hispidulum. Since your
>authority for R. tinctorum has L. in parentheses, there must be another name as the
>parenthetic L. credits Linneaus for first naming the species, but the author for this
>change must be included. My guess is that R. tinctorum (L.) is a mistake.
While Mabberley, the Plant Book, has Rubia tinctorum L. Maybe a case of color
vs. colour? Cannot get much madder.