Last weekend I saw several flowers along the highways in eastern Oklahoma. I was wondering if someone could help me identify them. I have already posted this to the "Name that Plant" forum, but also wanted to get some help from the Okies. :)

Red wildflower:

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A field of the red wildflowers pictured above:

{{gwi:171593}}

Short purple wildflower (no taller than 4 inches):

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Tall, narrow purple wildflower (12-18" tall):

{{gwi:171597}}

Another purple wildflower (6-8" tall):

{{gwi:171651}}

Any help would be much appreciated!