The cayenne pepper is a type of Capsicum annuum. It is usually a moderately hot chili pepper used to flavor dishes.
The habanero is a hot variety of pepper. Unripe habaneros are green, and they color as they mature. The most common color variants are orange and red.
The jalapeño is a medium-sized chili pepper of the species Capsicum annuum. A mature jalapeño can have a range of pungency.
African Piri Piri is made with bird’s eye chilli that is a chilli pepper a variety from the species Capsicum annuum. The bird’s eye chili is small, but is quite hot (piquant).