Chinese privet

This is an example of Ligustrum sinense in the family Oleaceae:

I found this plant along the road leading into Mule Jail on April 28, 2007.  This plant is not native to the United States and according to Wikipedia, was introduced from southeast Asia as an ornamental plant.

By the by, the National Parks Service has a pdf on invasive species that is worth a look.

large yellow vetch

Here is Vicia grandiflora of the family Fabaceae:

This particular plant was found along highway 49, north of Yazoo City in the Mississippi Delta.  The photo was made on April 4th 2010. 

golden zizia

Here is Zizia aurea of the family apiaceae:

This plant is native to the United States and Canada, per the USDA plants database.  This was taken on April 11, 2009 in Mule Jail.  This plant's family, apiaceae, is named for the carrot.  It is not yet documented west of the Rocky Mountains but ranges from Florida to Manitoba.  This particular plant still bore all its blooms, though I cannot tell if they are in the bud or the wilt.  Typically, Z. aurea displays bright yellow flowers.  Within this group of flowers there where a few that had the proper color but proved poor examples of the plant: