My sister-in-law makes a mild, reddish tea from the fresh leaves of this fast growing and spreading plant. It grows about 4' tall, and is flowering now, and the serrated leaves get up to 6" long. Her original cutting was given to her by someone from Palestine.

Gardeners in the plant identification forum have suggested bidens. I think this may be bidens tripartita, which is native to Palestine. Any thoughts? Here is a link to some photos I took recently. Thanks in advance for your help.

http://www.flickr.com/photos/17324338@N03/sets/72157622790033674/