Serrano pepper plant with red and green fruits
The serrano pepper (Capsicum annuum) is a type of chili pepper that originated in the mountainous regions of the Mexican states of Puebla and Hidalgo. Unripe serranos are green, but the color at maturity varies. Common colors are green, red, brown, orange, or yellow.
Their flavor is crisp, bright, and biting, notably hotter than the Jalapeno pepper they resemble, and they are typically eaten raw. Its Scoville rating is 10,000 to 23,000.

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| Heat: Hot (SR: 10,000-50,000) |
References
Try serrano Peppers in Salsa, they are a tasty pepper with just the right amount of hot for any one.
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