What flower is this?

Looks like Spanish Bluebell (Scilla hispanica):

I have them in my yard (New Jersey, USA). They do spread all over the yard but I tolerate them for 2 reasons. They're pretty. They're pretty much gone after the spring.

Note that you are posting from a forum, but many of the responses that you will see come from Usenet.

need help identifying this mysterious flower planted by some squirrels

orchid is correct. It's one of the difficult (to identify) spotted/marsh orchid group (Dactylorhiza).

need help identifying this mysterious flower planted by some squirrels

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Try spoted marsh orchid

Hi there, Its some type of wild marsh orchid, no doubt someone will tell you which one. I love them and I would thank that squirrel very much Haaaaaaaaa

lannerman.

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Agreed - I have them growing wild in my low maintenance garden section. I don't think squirrels plant them though. They are spread by seedfall and as far a as I know are symbiotic in that they need certain species of grass to grow with. Compo ion Caithness

Before someone pulls me up - I take back the symbiotic bit - I am getting confused in my old age!

"Compo in Caithness" wrote

Not symbiotic with grass but with a mycorrhizal fungus, indeed the seedlings need the fungus to allow them to live as the seeds contain little food for the growing seedling. The seed is so small it will be carried a long way on even a light wind and will germinate if it finds a suitable mycorrhizal fungus partner. Despite millions of seed they will never get invasive (you should be so lucky!). My own experience with these orchids (D. fuchsii and D. maculata and hybrids of) is that the seeds germinate amongst other plants in pots much more easily, lots have grown with my Plionies but then that is probably to be expected they being orchids too, but also in with a Bonsai tree and a lot in a large pot of turks cap lilies, I've never found one in the normal garden soil.