Help- no female flowers on winter squash

For the first time, I am growing winter squash, Curcurbita maxima, variety Stripett (a hybrid). The plants had a slow start (cool weather and slugs) but are now growing like mad and covering several square meters in my small greenhouse. A few male flowers have blossomed, several are currently in bloom, there are many coming. Problem - I see no buds looking like female flowers - well, at any rate if the female flowers look like those on the summer squash I have been growing for years, Curcurbita pepo, Ambassador (a hybrid).

So - is it possible that budding male and female flowers both have long narrow stems in winter squash (unlike summer squash)?

Or - if the female flowers do look like those on summer squash - why do I not get any? Too cool? Too wet? Too dry?

karsan