I was walking next to a row of trees (I think coniferous) and found many of these things on the ground:
A parallel bundle of 2-4 medium-brown needly things, about 15 cm long and 1 mm in diameter, not quite as sharp as a saguaro spine, a bit stiffer than a blade of grass, connected at one end by a darker brown bulb about 3 mm in diameter and 7 mm long. Very easy to pull apart.
What is this thing called?
EDIT: thanks to nextworldplz' answer, here's a picture of what I was describing (turns out to be specifically ponderosa pine needles):