Sorry, the upload didn't work. Here's a link to a picture of it. Here is a link that might be useful: Mystery plant

It was the Euphorbia trichaclenia. It was showing part of the root that it said was normally underground...which was kind of a big hunking ball. I couldn't see yours, but I don't think your pot was big enough to hold that kind of root. There was an interesting photo of a Jatropha multifida, a relative of Euphorbia, that had that Japanese maple look that made me think of your plant more closely. But your plant had a label of Euphorbia so that's out. Photos are like 95% of plants in habitate and I can't say that I recognized more than 5 of them! That's a newbie for you. Knowing the habitate helps me in knowing how to care for these things I seem to be killing off.

try verbena's. Seperate the flower head into individual flowers. Impatien's do not press well. They do not keep their color. Pansies press well. Daisy's Weeds, such as queen anne's lace. leaves of most tree's

If they have lots of moisture, press them between paper towels for a couple of days and then put them between waxed paper. Have you tried saving them by putting glycerin in water and lettimg them soak up the glucerin. The remain soft and pliable.