This is a non-native orchid, which Ontario Wildflowers says may be invasive, but it doesn’t seem to be crowding out my twitch grass 🙂
It’s only tiny (this flower is less than 1cm or about 1/3 inch) though on a spike of flowers.
This close up of a zinnia shows the flowers-within-a-flower that is typical of composites. The “petals” are ray-florets and these are disk florets.
To put it in perspective, here is a collection of whole flowers:
These were grown from seed.
Finally, one more picture of the castor bean flowers. The male and female are separate flowers which appear on the same plant. Here you see both (white is male, the red star-shaped part on top of the spiky ball is the stamen which shrivels and leaves the spiky part to harden and become sharp to protect the seeds which are also poisonous to us, though presumably there are creatures which eat them or they wouldn’t need the armour).