This weedy thing can really self-sow with abandon if you have it in or near your yard, and can take over if you let it go to seed. It is able to grow with virtually no summer water, and will germinate even in the middle of summer. My advice would be to eliminate it before it takes over, if you have it in your garden. The long tap root is very deep, and will resprout if not completely removed.

It looks like a crucifer to me but really need a close up of the flowers. Check the link below. Here is a link that might be useful: Brassiaceae of the southwest

chervil2, Thanks for reminding me that I needed to mention that if you double click on the photo above it will take you to my on line photo album with many more photos to identify. Once you open the photo album if you click on the largest box in the right hand corner of the page the thumb nail photos will be displayed at a reasonable size or you might prefer to choose view by slide show on the top of the left hand side. Hope that's not too confusing. kt

Hello Joshua! I am a Puerto Rican horticultor. So maybe i can help you. If you want, send to my e-mail (jardin_emilia@hotmail.com) an attachment of your picture and i will try to help you Id this plant that you saw in El Yunque. Cheers, Jorge Joel... Emilia's Garden