Passiflora  
NOOOO, Stop, Don't pull this weed!  Your butterfly caterpillars will prune it for you if you just let it grow a bit, and you'll get to enjoy watching them in your yard.
Passiflora Suberosa Flower, Corky Stem Passionvine Flower, small green flower
This plant is Passiflora suberosa, commonly known as Corky Stem Passion Vine. It gets tiny green flowers that are about the size of an adult fingertip.
I've put passion vines all over my yard because three different kinds of large beautiful butterflies lay eggs on them here in South Florida.  Planting the right passion vine is one of the easiest ways to make your yard a butterfly habitat if these butterflies are native to your area.
Zebra Heliconian
Gulf Fritillary
Julia Dryas
Here are two Zebra Heliconian butterflies laying eggs on a Passiflora subeosa vine.
Passiflora Suberosa leaf
Passiflora Suberosa trilobed leaf
Two female black and pale striped Zebra Heliconian, aka Zebra Longwing Butterflies laying tiny yellow eggs on the tender new growth of a Corky Stem Passionvine, aka Passiflora Suberosa Vine.
Passiflora suberosa, or corky stem passion vine, has a wide variation in leaf shape. Some leaves are pointy ovals, but others are trilobed. These pictures might help you find this vine so that you can transplant it to a suitable place in your yard instead of mowing it.
If those leaves aren't different enough to be tricky, check out these extremely trilobed leaves:
Passiflora Suberosa, Corky Stem Passionvine growing in a Florida lawn. It has trilobed leaves.
Passiflora Suberosa, Corky Stem Passionvine seedling growing in a Florida lawn.
Extremely trilobed Passiflora Suberosa, Corky Stem Passionvine growing in a Florida lawn
If their host plant is available, the butterflies will find it. Here is a butterfly egg on Corky Stem Passionvine:
tiny yellow Zebra Heliconian butterfly egg Passiflora Suberosa vine, Corky Stem Passionvine
The eggs hatch into tiny caterpillars that eat their host plant, in this case Passiflora suberosa, for a couple of weeks before they become a chrysalis and finally a butterfly. This caterpillar nibbling on the vine will become a Gulf Fritillary butterfly.
Orange and black Gulf Fritillary butterfly caterpillar chewing on Passiflora Suberosa, Corky Stem Passionvine
This caterpillar is ok to pick up, as are the butterfly caterpillars I've found so far. Moth caterpillars can sometimes give you a sting, so it is always best to do some research before picking up living things.
After the flowers bloom and get pollinated, tiny green fruits begin to develop. They turn a deep purplish black when they are ripe.
Passiflora Suberosa, Corky Stem Passionvine small green flower beginning to fruit
Passiflora suberosa is called Corky Stem Passionvine because after the plant is a couple of years old, the mature vine looks somewhat like cork:
Passiflora Suberosa, Corky Stem Passionvine dark ripe fruit
Passiflora Suberosa, Corky Stem Passionvine cork-like bark
Zebra Heliconian Butterfly Caterpillar eating Passiflora suberosa:
Black and white Zebra Heliconian butterfly caterpillar crawling across an unripe Passiflora Suberosa,Corky Stem Passionvine fruit
Green Spider hiding under a Passiflora Suberosa, Corky Stem Passionvine leaf
Any plant provides cover, so bugs like this green spider might lurk beneath a leaf. It blends in well on the vine; the spider's legs resemble the twisted and spiraled tendrils of vine that attach it to whatever it grows over.
Another visitor that you're likely to find on Corkey Stem is the Leaf Footed Bug:
This vine has both pointy oval and trilobed leaves growing within inches of each other. Some of the trilobed leaves are missing a lobe; does that make them bilobed?
Here is another Gulf Fritillary Caterpillar. I did some severe pruning and I was happy to see leaves sprout from the cork-like old vine I'd pruned back to.
Leaf Footed Bug, Chondrocera laticornis under a Passiflora Suberosa, Corky Stem Passionvine leaf
Passiflora Suberosa, Corky Stem Passionvine  small green flower
Passiflora Suberosa, Corky Stem Passionvine  small green flower
Passiflora Suberosa, Corky Stem Passionvine  small green flower
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