grass(only) killing herbicide

Hope not offend too much the people on this list who don't like the use
of chemicals, but . . .
I have heard of the existence of a herbicide that kills grasses, but not
other plants.  I don't know what its name is, who makes it, or if it is
available retail in the US .  ANyone know of such a product?  To relate
this to Mediterranean plants, I want to selectively eliminate grasses
(weeds to me) from an area where I have some particularly thorny Puyas
growing.  I could also see using it selectively in an area where I would
like to eliminate the present grasses (all non-native as far as I can
tell), without kiling the herbaceous wildflowers, so I can replant with
native grasses.
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