I've been trying to find corolla tube lengths for flowering plants I have on my study meadows in Finland, but that task seems to be harder than I expected. Flora Europea (Tutin et al. 1964-80) provides some corolla lengths, but only for 1/4 of my plant species. Does anyone have good ideas what articles or books I could check out for corolla tube lengths of Scandinavian plants? Thank you!

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