What is this stuff?

I just ran through some grass, chasing fast meeces... but I lost them.

... then I realised I was covered in these white feathery things, all over my black fur.
They were all over my face. They tickled my sensitive catty nose and made me do catty-choos.

I tried to lick some of them off me, but they got stuck to my tongue.

I feel a bit silly, covered in them.

I think they came from this plant...