The range is covered with lupine-bright blue, blue as your eyes. Well, almost as blue.
12 seconds sound clip from the Dark Command (1940) movie soundboard.
You can hear this line at 01:06:47 in the Blu-ray version of the movie.
Quote context
[...]
- How much further is it to the border?
- We'll cross it in a couple hours.
- Place you're headin' for is eight or nine miles down the road, Hill country.
- Don't know what lovely country really is till you've seen Texas in the springtime.
- The range is covered with lupine-bright blue, blue as your eyes. Well, almost as blue.
- Bob, I think we better get going.
- Yes.
- Well, you better start lookin' around again, 'cause I'm going to say something crazier than that.
[...]