[3] Their epidermis consists of bladder cells, which are tiny hair-like structures that help the plant retain water, especially during times of drought.

[3] The flower sepals and petaloid staminodes fused together to form wispy linear tubes concentrically aligned around a shell-shaped nectary.

[5] Fruits produced by the flowers contain fused valve wings and five locules with light brown seeds.

They are named "stone plants" due to their resemblance to rocks, which helps them avoid being consumed by herbivores.

Last, M. digitatum is a perennial, but does not tolerate extremely cold winters, so it is essential to keep the plant indoors depending on the region and to make sure they do not frost.