In Plant Database

Here

and here


They are not flower of a Plantago plant.

For Plantago alismatifolia, see plants in herbarium, here:

http://sernecportal.org/portal...

http://fm1.fieldmuseum.org/vrr......

An individual flower in the family Plantaginaceae shown as having four petals. In fact corolla is:
"sympetalous with four lobes" - page 254, Flowering Plant Family by Wendy B.Zomlefer.
(Sympetalous - having united petals, partially or wholly, forming a tube or funnel.)

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I think it is a plant in Alismataceae family. They have a generic common name "water-plantain" but are not plantain (Plantaginaceae). Unfortunately common name can easily cause confusion.

Maybe the plant from photo above is in genus Alisma

Like Alisma plantago-aquatica

http://en.wikipedia.org/wiki/A...

or Alisma triviale

http://www.em.ca/garden/native...

http://www.flickr.com/photos/1...

But I'm not sure about this ID.

@bonitin can look into this. She may have misidentified the bloom.

Thanks a lot Justin for pointing out my mistake, you're right, I looked it up and my plant is Alisma plantago-aquatica. I'll ask to change it.

Still, one photo, need to be moved

Done!