This is an extreme example of how Papilio indra females prefer to lay eggs on host plant stalks along the periphery of the host plant.  Wayne Whaley took this shot of a Papilio indra UT West Desert segregate egg that was laid on Lomatium grayi depauperatum.  If you can't see the tiny egg laid on a stalk almost completely surrounded by rocky outcroppings towards the top of this photo, click on next slide for closeups.