There's an app to help you with that, thanks to University of Missouri Extension.
Kevin Bradley, an MU Extension weed scientist, unveiled the smartphone app—ID Weeds—at a crop management conference earlier this month, according to a news release.
The app has information on more than 400 plant species that could be considered weeds in Missouri and surrounding states.
Users navigate through a series of drop-down menu boxes for various plant characteristics.
The app is designed for those not familiar with botanical terms, such as ligules or spatulates.
Any time an unfamiliar technical term shows up, users can click on "what's this" to see an illustration.
By clicking on "identify," users can view a list of weeds that match the chosen characteristics.
Selecting a weed on the list brings up detailed information and an image.
James Meng, a programmer for MU Extension Technology and Computer Services in Columbia, developed the free app.
ID Weeds is compatible with iPhone, iPod Touch and iPad running iOS 5.1 or later, and devices running Android 2.2 or later.
To download for iPhone and other iOS devices, visit http://itunes.apple.com.
For Android units, search for "ID Weeds" at http://play.google.com/store.
A Web version of Weed ID can be viewed at http://weedid.missouri.edu.