Capsicum annuum var. glabriusculum

Capsicum annuum var. glabriusculum is the wild form of the common chilli pepper and is commonly known as chiltepin, bird pepper, Indian pepper, or grove pepper. It grows naturally as a perennial shrub that can reach roughly 1 to 3 metres tall in favourable wild conditions, particularly in desert, scrub, and semi-arid environments where it persists without cultivation.

This wild variety is widely accepted as the genetic ancestor of all domesticated Capsicum annuum peppers. Genetic and archaeological evidence shows that early chilli domestication in Mesoamerica involved glabriusculum populations long before cultivated peppers spread globally.

Fruits are very small, typically about 8 millimetres across, roughly pea-sized, and ripen from green to bright red. They are borne singly or in small clusters and are readily eaten by birds, which do not sense capsaicin heat. This bird dispersal plays a key role in the plant’s natural spread.

Heat levels are very high but extremely variable. Wild chiltepins are commonly reported from tens of thousands up to around 140,000 Scoville units, depending on environmental conditions and fruit maturity. A single-value estimate of 100000 SHU is used here as a practical midpoint across wide observations rather than a fixed measurement.

The natural range includes the southern United States, Mexico, Central America, the Caribbean, and northern South America. The plant favours well-drained soils and sun-exposed sites but can also grow under nurse plants or in disturbed landscapes.

Capsicum annuum var. glabriusculum has been used by Indigenous peoples for thousands of years and holds strong cultural, ecological, and historical significance. As the wild progenitor of domesticated annuum peppers, it represents the root of modern chilli diversity rather than a cultivated or selected form.