A bumblebee works with night and day flower Melampyrum nemorosum.
Wikipedia latin name of flower.
Since the author of the article lacks all his books (compare the word Bible = collection of books) in general according to ”legal punishment” and his flora in english particulars bought in the capital Stockholm, so the names of the flowers and also their latin names (Carl von Linné) are absent. Logic says: With flowerbook = knowledge; without flowerbook = without knowledge. But the pictures can be beautiful to see from midsummer.