What's this plant's name?
Thank you for attaching the images. The plant is Bryophyllum delagoensis, formerly Kalanchoe delagoensis. It is a succulent perennial which can be grown outdoors in warm climates but it will also do well in a pot if in well-drained potting mix.
It is native to Madagascar. It is an invasive species in Australia where it is displacing native plants. (https://en.wikipedia.org/wiki/Bryophyllum_delagoense)Also see http://davesgarden.com/guides/pf/showimage/21107/