Our two trees do not agree. Originally, when we made our hypothetical tree we were going to Day Lily and Christmas cactus were more closely related, with more of a common ancestry. However, because the number of apertures and their size were similar, we went with Christmas Cactus and Pin Cushion Cactus being more closely related. We thought this because they had similar size, 58 micrometers, and 59 micrometers. They also had the same surface texture, Psilate.
However, we trust the 2nd tree more, because we do know that it's possible through convergent evolution that the Pin Cushion Cactus and Christmas Cactus do not share common ancestors, but they do look alike because they could have gone through similar situations to develop their characteristics.
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