Capsicum friburgense

Overview

Capsicum friburgense is a wild shrub endemic to Rio de Janeiro state in southeastern Brazil. It inhabits the shaded, humid understorey of high-elevation Atlantic Forest, rather than the open gardens and fields where familiar chilli peppers grow.

The most memorable feature is its flower: the entire corolla is pink, violet or fuchsia, shaped like a little bell or urn, with short petals that curl back as the flower opens. It looks strikingly different from the white, star-shaped flowers of most cultivated peppers.

The berries are equally unusual. Instead of ripening red, they turn dark green to greenish-golden yellow. Immature berries are described as pungent, but mature fruit can be barely hot or even noticeably sweet.

Scientific name

Capsicum friburgense

Family

Solanaceae

Native range

Rio de Janeiro, Brazil

First published

2005

Growth

Wild shrub, usually 0.8–2.5 m

Flowers

Pink to lilac; bell-shaped

Ripe fruit

Greenish-golden yellow; 4–10 mm

Seeds

Brownish-black to black

Discovery & naming

The modern scientific history of C. friburgense centres on Nova Friburgo, a mountainous municipality in Rio de Janeiro state. On 6 April 1986, Luciano de Bem Bianchetti and fellow collectors gathered the specimen that would become the official reference for the species, on the slopes of Morro da Caledônia at approximately 1,800 metres elevation.

The plant was formally named by Luciano de Bem Bianchetti and Gloria E. Barboza in their paper Three New Species of Capsicum (Solanaceae) and a Key to the Wild Species from Brazil, published in Systematic Botany on 13 December 2005. Its name refers to the Nova Friburgo area where the species was documented.

The publication came nearly twenty years after the reference collection was made. It illustrates how even striking flowering plants can remain unnamed in science until specialists compare preserved specimens, study their features and distinguish them from close relatives.

Plant & leaves

In the forest, C. friburgense grows as an upright shrub, typically 0.8 to 2.5 metres tall, although some plants approach 3 metres. Its upper branches fork and often hang in a loose zigzag pattern. Younger stems are slender, green and somewhat fragile; older stems develop smooth, dark-brown bark.

The foliage is soft and thin, with pointed oval to elliptical leaves. Like a number of wild Capsicum species, it produces unequal pairs of leaves at the same branching point. Larger leaves are usually about 8.5–13 cm long, while the smaller partners may be only 2–3 cm long. Fine hairs occur on the stems, veins and leaf edges, together with minute glandular hairs.

These leaf pairs and slender branches give the plant a fairly delicate appearance, despite its ability to grow into a substantial forest shrub.

Distinctive pink flowers

The vivid flowers are this species' clearest distinguishing feature. Each is about 7.5–10.5 mm across, with an entirely violet, pink or fuchsia corolla. Rather than opening into a broad star, the petals form a bell-shaped, slightly urn-shaped flower. The short lobes at the edge bend outward or curl back as the flower opens.

The buds are also purple or fuchsia. Flowers appear singly or in pairs along the branches, carried on comparatively long stalks. At the flower's base sits a green calyx with five small pointed projections.

Inside, five stamens carry pale anthers that can turn grey-purple after releasing pollen. These subtle details are useful for botanists, but the completely unspotted pink flower is the easiest feature to recognise in the field.

Fruit, seeds & heat

The small round berries measure about 4–10 mm across. They begin light green and become dark green to a greenish-golden yellow at maturity. Their thin, slightly translucent skin differs from the thick walls of many cultivated chillies. When ripe, the berries detach readily from the plant.

One of the most interesting observations in the 2022 monograph concerns pungency. The researchers described immature fruits as pungent, while fully ripe fruits were scarcely pungent to rather sweet. That is a useful reminder that heat can vary within wild pepper species and even with fruit maturity; a single Scoville rating would not describe this plant very well.

Each berry usually contains four to nine seeds, occasionally as few as two. The seeds are brownish-black to black, curved in outline, and have a textured surface visible under magnification. The developing fruit hangs from a remarkably long stalk that can reach 65 mm.

Mountain forest habitat

C. friburgense has a very narrow native distribution in the central mountains of Rio de Janeiro state. Its known habitat is the understorey of primary, humid Atlantic Forest in the Serra do Mar, at elevations of approximately 1,750–1,950 metres.

These high mountain forests are cooler, wetter and more sheltered than the tropical lowlands often associated with chilli peppers. The plants grow beneath an established forest canopy in a landscape of steep slopes and persistent moisture.

The 2022 study recorded flowering between December and May and fruiting between February and May. Its chromosome count is n = 13, a detail of scientific interest because many familiar cultivated peppers have a different base chromosome number.

How it differs from its relatives

C. friburgense belongs to the Atlantic Forest group of wild Capsicum, alongside species including C. mirabile, C. cornutum, C. campylopodium and C. carassense.

It grows in the same general Nova Friburgo region as C. mirabile, and the two can resemble one another when only fruit and seeds are available. Flowers make the distinction much easier. C. friburgense has one or two unspotted pink, bell-shaped flowers per node; C. mirabile usually has two to five multicoloured, star-shaped flowers.

The fruit stalks also provide a clue: those of C. friburgense may reach 65 mm, compared with up to about 32 mm for C. mirabile. According to the monograph, these are the longest fruit stalks among the Brazilian species of Capsicum.

Conservation

Its beauty contrasts with its precarious position in the wild. The 2022 monograph estimated fewer than 250 mature individuals and identified continuing declines associated with deforestation, development, changes in water conditions, fires and extreme rainfall.

Two known areas occur within protected landscapes: APA do Caledônia and Parque Estadual dos Três Picos. Protection matters, but the species' small range leaves it vulnerable to local events such as the severe floods and landslides recorded in the region in 2011.

Using IUCN assessment criteria, the monograph's authors assigned Critically Endangered (CR, C2a(i)) as a preliminary scientific assessment. This should not be mistaken for confirmation of a separately published official IUCN Red List assessment. The finding highlights the importance of protecting its remaining mountain-forest habitat.