An unusually frequently-copied large flower painting. Fred Meijer (RKD) counts 13 such copies and suggests that many were produced by Jan the Younger and his studio. Here are the ones I know of:
It is interesting to note that these copies are sometimes of very different sizes.
Brenninkmeijer-de Rooij suggests that this is the painting mentioned in a letter of March 25, 1611, from Brueghel to Bianchi: he says that he has embarked upon a large painting "with surely a thousand flowers...."