In preparation for my absence I have been putting together booklets with identification information for plants in the nature park. The first, Non-native Weeds in the South Pasadena Nature Park, Part 1 (33 MB), has ten aggressive weeds that are common in the park. I will be adding to this list, and will also post similar information for the native plants. Please feel free to use this material in any way that is helpful, though photo credit is greatly appreciated (and you have to pull a few weeds as payment).
Just noticed a mistake – argh – but will have to fix it later. Still wanted to post this asap, so enjoy and please let me know if you catch any other errors.