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.
