#5: Ghost Pepper (Capsicum sinense) @Horseshoe says, "Bhut Jolokia (a.k.a. "Ghost Peppers") was considered the hottest available until 2009 when Trinidad Scorpion was proven to be higher on the Scoville scale."
@DanCarmona added, "Bhut Jolokia Capsicum: .Chinense Origin: .India PI: . Scoville units: .1,041,427 Blossom end shape: .pointed Fruit position and shape: .pendant, elongate Fruit size and color: .3¼ "x 1 ¾" green > red Calyx shape: .saucer shaped, toothless Flower: .stellate, small, bell-shaped Petals/Spots: .white/none Filament color: .white Anther color: .blue Habit: . small, usually low bush Stem: .smooth Leaves: .large, uneven Germ. Time: .3 wk. >.3 mo. Maturity: . 95 days Plant height: .24 > 36" Taste: . Uses:· This landrace chile originates from the northeast of India, particularly Assam, Nagaland and Manipur. It belongs to Capsicum chinense family and is known by many names in the different Indian provinces."