Milky sap. Bushes out from a central stem. Relatively attractive weed that I let grow in my little "garden" area along the SE side of the house.
I have always thought the long legs were a little cumbersome for this type of critter...seeing them walk around on the lawn or other relatively flat surfaces. But, watching them navigate the bushy plant type flora like a high wire specialist as this one was doing...is something to behold.