How about a pic of the flower? Kind of looks like a Lantana to me... If so, it's a very fragrant plant, flowers and leaves. Any odor?

White sweet clover.....Melilotus alba Here is a link that might be useful: White sweet clover flower

The European Pear Pyrus communis is a species of pear native to central and eastern Europe and southwest Asia. The European Pear is one of the most important fruits of temperate regions, being the species from which most orchard pear cultivars grown in Europe, North America and Australia are developed. Pear tree in flowerEuropean pear trees are not quite as hardy as apples, but nearly so. They do however require some winter chilling to produce fruit. For best and most consistent quality, European Pears are picked when the fruit matures, but before they are ripe. Fruit allowed to ripen on the tree often drops before it can be picked and in any event will be hard to pick without bruising. They store (and ship) well in their mature but unripe state if kept cold and can be ripened later, a process called "bletting". Some varieties, such as 'Beurre d'Anjou', ripen only with exposure to cold.

A friend found it in her yard. We live in Venice Florida. Nothing has sprouted yet. She said it has a liquid inside of it and it smells like a cucumber. I spk to a few other people and one said looks like a cactus? they are looking into it as well. Thank you, wish I could give you more info.