Purple flower/weed poisonous for guinea pigs?

[wheekmau5]

There are a lot of these patches of purple flowers/weeds in my backyard so I did not put my guinea pigs out on the run. Do you think they are poisonous to guinea pigs hmy:? I will try try to take a picture with my phone ( low-quality :weepy

 

[lissie]

Do you know the name of the weeds? Here's a poisonous plant list (scroll down towards the bottom).
https://www.guineapigcages.com/foru...y-nutrition-charts-poisonous-plants-list.html

 

[wheekmau5]

I have no idea on what they are called, I will take a pic and send to a botanist forum.