Capsicum hookerianum

Overview

Capsicum hookerianum is a wild member of the pepper genus native to western Ecuador and northwestern Peru. Unlike the domesticated chillies grown for their heat, its small red berries are non-pungent. The plant grows as a loosely climbing or scrambling shrub, making its way through the vegetation of seasonally dry forests.

Its most striking feature is not the fruit itself, but the persistent calyx at its base. As the berry matures, long narrow projections spread or bend backward around it, giving the fruit an unmistakable botanical appearance. Together with its dark brown older stems and leaves that taper unusually far along their stalks, these features help distinguish it from other wild peppers.

Native range

Ecuador & Peru

Growth habit

Scrambling shrub, usually 1–3 m

Flower colour

Yellow to ochre

Ripe fruit

Bright red, 5–9 mm

Pungency

Non-pungent

Habitat

Dry deciduous forest, 100–1,000 m

Discovery & naming

The story of C. hookerianum reaches back to January 1846, when the Scottish botanist William Jameson collected material near Guayaquil, Ecuador, at a locality recorded as Cerro de Lantana. John Miers published it in 1849 under the name Brachistus hookerianus, before Otto Kuntze transferred the species to Capsicum in 1891.

The original naming material concealed an unusual problem. Miers had considered both plants cultivated at Kew Gardens and specimens collected in Ecuador. Later examination found that the cultivated specimens belonged to another species, Capsicum rhomboideum, whereas Jameson's wild Ecuadorian plant matched the species now called C. hookerianum.

In 2011, botanist Gloria Barboza formally selected Jameson's 1846 specimen as the name-bearing reference, helping to settle the identity of the species. Other names published for related collections, including Capsicum eggersii in 1922, are now treated as synonyms.

Plant & foliage

This species is a branching shrub or subshrub, usually 1–3 metres tall, though smaller plants occur. The flexible younger branches may lean into nearby vegetation. As the stems mature, their bark becomes dark brown, with pale, rounded breathing pores known as lenticels along the surface.

The leaves occur in unequal pairs. The larger leaf is commonly 4–12.5 cm long and rich green above, with a paler, sometimes hairy underside; its paired partner is smaller and often more rounded. The leaf base extends down towards the stalk, sometimes making the stalk appear to have narrow wings. This long-tapering base is one of the features botanists use to recognise the plant.

Flowers & calyx

The flowers appear in small groups, commonly two to seven at a leaf axil, on delicate downward-pointing stalks. Their corollas are bell-shaped, yellow to dull ochre, approximately 8–10 mm across. Five short petals form the rim of the bell, surrounding five stamens with yellow anthers.

The green calyx beneath each flower usually carries eight to ten narrow projections of unequal length. Five are typically longer, with shorter ones in between. This arrangement becomes especially visible once the flower develops into a berry.

Collectors described the flowers as uniformly yellow or ochre, rather than the purple-spotted pattern seen in some other wild Capsicum species. The detailed 2022 study based its flower description mainly on preserved material; its researchers did not encounter flowering plants during their fieldwork.

Fruit & seeds

The berries are almost round, just 5–9 mm wide. Young fruits are green or yellowish, becoming an intense, glossy bright red when ripe. They hang on short, slightly angled stalks instead of standing erect like the fruit of some cultivated bird peppers.

Despite their chilli-like appearance, the fruits are described as non-pungent in the botanical monograph. The small berries have a relatively thick wall and typically hold around 22–45 seeds, although lower counts occur. The seeds are yellow to brown rather than jet black.

At maturity, the long calyx projections remain around the base of the berry. They may radiate outward or curve backwards, creating the horned appearance that separates this species from most familiar cultivated chillies.

Range & habitat

Capsicum hookerianum is restricted to western Ecuador—including Guayas, El Oro, Loja and Manabí—and northwestern Peru, particularly Tumbes. It is a member of the Andean evolutionary group of peppers, but unlike many relatives it grows mainly west of the Andes at lower elevations.

Its recorded habitat is seasonally dry, deciduous forest between about 100 and 1,000 metres. In these environments, rain and dry seasons shape the growth cycle, and the plant uses nearby shrubs and trees as support for its flexible branches.

Botanical records indicate flowering mainly from November into April, sometimes extending to July, and fruiting from late December through July. These periods describe observations from its native region, not a fixed calendar for garden-grown plants elsewhere.

Identification & relatives

C. hookerianum belongs to the Andean clade, a group of wild peppers that differs substantially from the domesticated annuum, chinense and baccatum lineages. Its combination of dark older stems, strongly tapered paired leaves, yellow bell-shaped flowers and red non-pungent berries is especially useful for identification.

It sometimes grows in the same region as Capsicum rhomboideum, but the latter tends to be a more vigorous plant, with denser, branched hairs and flower groups that can contain more flowers. C. hookerianum generally has simpler hairs and groups of two to seven blossoms.

Another lookalike, Capsicum caballeroi, also has numerous calyx projections, but differs in its leathery leaves, more elongated flowers and pungent fruit. Such distinctions show why the flowers, fruit bases and foliage are often more reliable than fruit colour alone when identifying wild peppers.

Conservation

Although the species is recorded from numerous sites, its lowland forest habitat faces clearing and fragmentation outside protected areas. The authors of the 2022 Capsicum monograph calculated a limited occupied area and assigned Near Threatened as their preliminary conservation assessment.

This is a published scientific assessment, not a claim that the species has a separately verified official IUCN Red List entry. Maintaining the remaining dry-forest habitat matters for a wild species with a naturally narrow range, and preserved herbarium collections remain important records of where it has occurred.