I agree it is an interesting curiosity test. I'm not sure how you quantify your answers though. Different people react to different toxins, and dosage varies considerably from plant to plant even within species. There is also the danger that someone sees the result, for example that black berries are on average safer than red ones, and uses that as their guide in future.
However, in the spirit of the thread, lets add cowberries to red (edible) and crowberry to black (also edible). Cranberry to red. Dewberry to black (edible). Ah, hang one... do you treat the several hundred microspecies of blackberries as one species or several hundred? You could get into a heated argument with a taxonomist right there. Lets throw in cherry laurel, cotoneaster (several types), hawthorn, tutsan, bearberry (bearberries are both black and red, depending on the variety), stone bramble (red, not sure of edibility, but looks like an unripe blackberry), burnet rose (a black rosehip essentially), berry catchfly (black). Do you include the hybrids? Does juniper count as black, or purple?
Sounds like a big job. Some of those berries are red at some stages, and black at others.
However, in the spirit of the thread, lets add cowberries to red (edible) and crowberry to black (also edible). Cranberry to red. Dewberry to black (edible). Ah, hang one... do you treat the several hundred microspecies of blackberries as one species or several hundred? You could get into a heated argument with a taxonomist right there. Lets throw in cherry laurel, cotoneaster (several types), hawthorn, tutsan, bearberry (bearberries are both black and red, depending on the variety), stone bramble (red, not sure of edibility, but looks like an unripe blackberry), burnet rose (a black rosehip essentially), berry catchfly (black). Do you include the hybrids? Does juniper count as black, or purple?
Sounds like a big job. Some of those berries are red at some stages, and black at others.