Hi Peter,
I have not read Slack's book but there's a good chance that the
plants he was writing about were hybrids with or were simply
D. capilaris, which has pink/reddish flowers.  Would anyone
happen to know what part of North America these pink petaled
D.rotundifolia are supposed to be from?  I'm not trying to prove
they don't exist but rather that they do.
Oh since Fernando started talking about Drosera flower colors
it has got my interest up.  Could someone (most likely Jan)
help fill in this list?
Drosera                   Flower Color
--------------------------------------
filiformis                lavender
var. tracyi               ?
intermedia                white
rontundifolia             white
brevifolia                ?
capilaris                 not sure of exact color
anglica                   ?
linearis (sp?)            ?
Thanks,  Dave Evans