What is the name of the green seeds used in hill country and sides of roads

I have seen over the years tons of exit ramps and entrance ramps on the expressway, Being done in this Love grass..The reason being it's in roles I believe 10 or 12 ft wide like a carpet..From the top of the hill to the bottom then it is watered. It contains the seed, fertilizer and a substance that serves the same as straw. This combo keeps it from washing off during the rains..
 
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