Hi,
I know that by the Catholic University in Porto Alegre (Brazil) there are a few Campomanesia lineatifolia trees, about 20 years old. You can check out the annual weather in Porto Alegre here: http://en.wikipedia.org/wiki/Porto_Alegre#Climate
That should give you an better idea how cold hardy it is.
Tomas
Oh, very clever of you, thanks. I see historical records speak of -4 º C, but maybe those -4 ° C occurred over 20 years ago, do not know, and perhaps also the trees to be in an urban environment have never come to suffer such -4 º C, may have been at -1 ° C, I guess ...
"The winter is mild, windy, and quite changeable, which is also a feature of this time of the year. Usual winter temperatures range from 4 °C (39 °F) to 16 °C (61 °F). In the coldest days of the year the temperature may fall slightly below zero, like in 2012, when it was recorded −2.1 °C (28 °F)."
Very similar climate, just like the urban temperatures at my city.