I like these grasses, and in my books it was pictured as P. alopecuroides. But you made me doubt the book (local books not so trustworthy), I had to search the answer and turned to my favorite site: wikipedia.
Here in Thailand you couldn’t find a single one up until roughly 5 yrs ago. Now the trend caught up and you see them everywhere. There is a new one popping-up every year or so. I believe the trend should spread with the same speed in the Philipines : seeing is believing.