Flower ID

Some more I haven't I.D.ed yet. Picture 317.jpg
 
Tom, I assume these are all weedy non-native PB vegetation.

Number one is spotted knapweed. A pernicious pest.

Number two is unknown to me..pea family?

Number three looks like a Chrysanthemum.

Number four is unknown to me....looks like Spirea....but the flowers are too big. Is that a Browns Mills Lake in the background?
 
Picture 321.jpg This weekend I'm going to look along the Rancocas S. Branch. Should I look for a spot with good sun penetration?
 
Do butterflies lay their eggs on Milkweed?

It is very possible that they do. The Milkweed plant is a very important plant to the Monarch Butterfly. It is their sole food source. Once the eggs hatch the caterpillars eat their egg cases and then start to feed on milkweed. It would make sense for the eggs to be laid right on the milkweed plant. That way the caterpillars don't need to search for a plant once they are hatched.
 
Post#43 Looks like Wild Indigo- Baptisia tinctoria and #52 Wintergreen, Striped princes pine-Chimaphila maculata.