Vigna luteola  
One of the first butterflies I put on my site was a tiny Ceraunus Blue Butterfly. I found it laying eggs on Vigna luteola. Those pictures were so awful that when I got to plants they weren't worth using to make a page on.

I have a yellow flowered weed in my yard that I've paused to ponder, and even photograph, from time to time, but I always had other more urgent updates to get to, so it's still on my lengthy list of things to make a page about, or was until an email from J. B. Sherrick brought my attention back to it.

Thanks J.B. I was outside getting more pictures of my yellow flowers after I read your email identifying a yellow flower in my sites as Vigna luteola, and I realized that I have Ceranus butterflies in my yard and I'd completely missed them.

Wild Cowpea, or Vigna luteola, is a vine. in this next picture you can see it twining around another plant at the waters edge. Oh, those adorable bugs are damselflies that rested briefly on the vine while I was watching the butterflies.

Vigna luteola, Wild Cowpea, Yellow Flower
Flowers are pretty, and butterflies fun, but where there is food, which both flowers and butterflies are, there are also predators:
Vigna luteola, Wild Cowpea, three leaf clusters on the vine
Ceranus Blue Butterfly on my fingertip
Mating Damselflies on Vigna luteola, Wild Cowpea
The ambush bug is looking for dinner, and any butterfly, caterpillar, or other bug will do.
Ambush Bug on Vigna luteola, Wild Cowpea
Brown Stink Bug, Euschistus servus, on Vigna luteola, Wild Cowpea
Another visitor I found walking the vine was this Brown Stink Bug, Euschistus servus. These bugs eat the plant, not the caterpillars.
Ceraunus Blue Caterpillar on Vigna luteola, Wild Cowpea
Speaking of caterpillars, that bug on the flower in my hand  isn't a green roly poly, it's a Ceraunus Blue Butterfly Caterpillar!
This close up of the stem beside the flower has a LOT going on. Before you read any more, take a look at it more carefully. How many creatures are in it? What are they? There is a clue in the picture to help you find one of them.
Let's see how you did. There are several ants, a flower crab spider, and a Ceranus Blue Caterpillar. Under the second ant from the top are little dark colored lumps. When you see those, look above them to find your caterpillar.
Some caterpillars are camouflaged so well that they're hard to see. Their frass (caterpillar poop) can help you find them since sometimes it's easier to spot.
Wild Cowpea, or Vigna luteola, has bright yellow flowers, and is a nectar source for Ceranus Blue Butterflies. This butterfly has it's proboscis in the flower.
Wild Cowpea Seed Pods are long and hairy. I found this pair of tiny black weevils on one of the pods. When time permits, I'll give them their own page.
Ceraunus Blue Caterpillar, frass, ants, and flower crab spider on Vigna luteola, Wild CowpeaVigna luteola
Ceraunus Blue Butterfly Sips Nectar From Vigna Luteola Flower
Vigna luteola seedpods
Tiny Black Weevils
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