Capsicum rabenii

Overview

Capsicum rabenii is a wild and sometimes semi-domesticated chilli native to Brazil and Paraguay. It is best known in Brazil under names such as pimenta cumari, pimenta comari and comarim, where its very small but pungent berries have a long history as a condiment. It grows naturally in forests and openings, but is also kept in home gardens, grown on farms and encountered around settlements.

Unlike the familiar large-fruited cultivated peppers, it bears small, usually upright berries that develop from green to orange or bright red. Its flowers are particularly attractive: the spreading corolla often has a purple or lilac outer band, with greenish-yellow markings towards a pale centre. The soft, hairy undersides of its leaves provide a second important identifying feature.

There is an unusual twist in its identity. Much of the chilli literature of the twentieth and early twenty-first centuries calls this plant Capsicum praetermissum or Capsicum baccatum var. praetermissum. Those names refer to the same species, but the older name Capsicum rabenii, published in 1846, has priority. It was restored in the comprehensive 2022 revision of the genus and is now accepted by the Royal Botanic Gardens, Kew and USDA GRIN.

Accepted name

Capsicum rabenii Sendtn.

Family

Solanaceae

Native range

Brazil & Paraguay

Growth habit

Branching shrub, 0.7–2.5 m typically

First description

1846, Flora Brasiliensis

Also known as

C. praetermissum

Flowers

Purple/lilac edge; green-yellow centre

Ripe berries

Orange to red; pungent

Seeds

Pale yellow, 3–4.2 mm

Chromosomes

2n = 24

Discovery & naming

The documented scientific story begins in nineteenth-century Brazil. The original gathering was labelled Raben no. 301, from the Rio de Janeiro region then referred to as the Provincia Sebastianopolitana. The collector was the Danish count Frederik Christian Raben. The species is named in his honour; its ending, -ii, marks a botanical name derived from a person's surname.

In 1846, the German botanist Otto Sendtner described Capsicum rabenii in volume 10 of Flora Brasiliensis, the major nineteenth-century botanical survey of Brazil associated with Carl Friedrich Philipp von Martius. The original description appeared on page 145. It was a validly published name, but its identity later became obscured as different botanists compared similar wild peppers.

In 1903, the names Capsicum microcarpum var. tomentosum and related collections added another strand to the story. This name was based on material collected by Émile Hassler in Paraguay in December 1900. These plants have subsequently been placed within C. rabenii.

The largest change occurred in 1958, when Charles B. Heiser Jr. and Paul G. Smith described a pepper from Viçosa, Minas Gerais, as the supposedly new species Capsicum praetermissum. Their reference collection, Ynes Mexia 4205, had been gathered on 3 January 1930. The authors thought that the older Brazilian names did not fit their plant, so they published a new one. Its distinctive flower colour and leaf hairiness would make the name widely familiar to pepper researchers and growers.

In 1971, Armando T. Hunziker treated the same plant as a variety of Capsicum baccatum, publishing the combination C. baccatum var. praetermissum. As a result, one biological species appeared in the literature under several classifications: an independent species called C. praetermissum, a variety of C. baccatum, and the much older but less-used C. rabenii.

The 2022 monograph by Gloria Barboza and collaborators revisited the old names, original specimens and modern research. The authors determined that Sendtner's 1846 plant and Heiser and Smith's 1958 plant belonged to the same species. Because the earlier name applies at species rank, Capsicum rabenii takes priority. They selected the original Raben no. 301 specimen held at the herbarium in Brussels, Belgium, as the name-bearing lectotype (BR 0000005529261). That choice anchored the name to a particular preserved specimen rather than to the shifting interpretations of later authors.

The revision also resolved a particularly telling historical mix-up. Another Raben-labelled specimen in Copenhagen bears a notation indicating Rio de Janeiro in 1835. It had been suggested as part of the original gathering, but the monograph's authors found that this Copenhagen plant was actually C. baccatum var. baccatum. The Brussels specimen has the densely hairy leaf undersides expected of C. rabenii. The 1835 date therefore should not be treated as a secure collecting date for the name-bearing C. rabenii specimen.

For older articles, seed-bank records and online descriptions, searching for Capsicum praetermissum and C. baccatum var. praetermissum remains useful. These are historical scientific names for the same taxon, not separate species recognised alongside C. rabenii in the 2022 treatment.

Plant & leaves

Capsicum rabenii usually forms a many-branched, upright shrub or a slightly scrambling subshrub, around 70 cm to 2.5 m tall. The botanical description also records plants from roughly 50 cm up to 3 m. Strong branching often begins near the base, producing a bushy plant with numerous flowering and fruiting shoots. Some plants persist beyond a single growing season in suitable climates.

Young stems are green, somewhat angled and often clothed in fine, pale hairs. New shoots can appear conspicuously whitish and softly fuzzy before the hairs become sparser with age. The nodes may be green or tinged purple. Older stems develop dark-brown, faintly striped bark without the obvious pale pores found in some other wild peppers.

Leaves are arranged in pairs at the branching points, sometimes with one slightly larger than the other. The larger leaf is generally 5.3–10 cm long and 2.4–6.5 cm wide, broadly ovate with a pointed or long-pointed tip and a smooth margin. Its stalk is typically 2.5–3.5 cm long and may look narrowly winged near the blade, where the leaf base tapers downwards. Smaller companion leaves are generally around 3–4 cm long and 1.4–2 cm wide, with shorter stalks.

The leaf surfaces look different. Above, the foliage is green and may seem only lightly hairy. Beneath, it is lighter green and has longer, spreading hairs following the main veins. Small clusters of hairs occur where side veins meet the central vein, creating a distinctive woolly or tufted appearance. These hairs are among the strongest clues for separating C. rabenii from similar-looking wild C. baccatum.

The degree of hairiness varies between populations. A few plants from Goiás lack the dense woolly covering along the veins, but still show hairs gathered in the vein junctions and the characteristic flower markings. The species is therefore best recognised by several features together, rather than by one leaf character alone.

Flowers & calyx

The flowers appear at the leaf joints, usually in groups of two to four. They are carried on fine green stalks commonly 12–18 mm long, although the monograph gives a broader range of about 8–25 mm. Each stalk bends sharply near the flower so the blossom can face outward even when the supporting stalk points upwards. Botanists call this a geniculate pedicel; it is particularly clear in detailed photographs of the species.

Each flower usually has five petal lobes, sometimes four. The corolla spreads into a wheel-like or shallow star-like form around 9–15 mm across and 6–7 mm long. Its striking colouring is concentrated on the inner face: purple or lilac towards the lobe margins, greenish-yellow or green towards the throat, and often a cream-coloured central area. The reverse can appear whitish-green or lilac with a touch of yellow-green. Because the colours form a banded pattern, the flowers can look very different from the plain white blooms of common cultivated bird peppers.

There is variation in flower shape and pigment. The botanical photographs show both more rounded, wheel-shaped corollas and more pointed, star-like ones. In a particularly unusual record from São Paulo, researchers found one plant producing completely white flowers near plants with ordinary purple-bordered blooms. The 2022 authors suggested a possible recessive genetic cause for this unusual lack of pigmentation, but did not present it as proven.

Behind the corolla sits a thick green, cup-shaped calyx, usually 1.5–2 mm long at flowering. It bears five short, erect projections, about 0.8–1.1 mm long. These are much shorter than the dramatic calyx projections found on some other wild species. Fine hairs cover the calyx and flower stalks.

Five stamens normally surround the pale central style. The anthers are cream, white or yellow; the filaments can be lilac or purple. The style is approximately 2.6–2.8 mm long and usually extends beyond the anthers, making its stigma visible in a front-facing flower. The corolla also has tiny glandular hairs on its inner surface. The combination of the purple edge, yellow-green centre and short five-toothed calyx gives the flower considerable identification value.

Fruit & seeds

The berries are small, held upright, and distinctly pungent. Round to slightly flattened fruits usually measure 5–7.5 mm in diameter; more elongated fruits may reach 7–11 mm long and 6–8 mm wide. Fruit shape varies even within the species, with some berries globose and others oval or ellipsoid.

As the berries develop, they begin green and ripen to orange or bright red. Ripe fruits may detach from the plant rather than remain attached for long periods. Their erect orientation and tiny size help distinguish them from the drooping, often much larger pods of many cultivated chillies. The calyx persists underneath, widening to around 4–4.5 mm with five short projections that may point outwards as the berry expands.

Although small, the fruit has a comparatively substantial wall and is structurally similar to those of its close Baccatum-group relatives. The 2022 monograph describes enlarged cells within the fruit wall and a pitted or alveolate inner surface. This is an anatomical feature studied under a microscope, not simply something obvious from the outside of a berry.

Fruit usually contain 7–15 seeds, occasionally as few as five. These are relatively large for such tiny berries, approximately 3–4.2 mm long and 2.5–2.8 mm wide. They are pale yellow to yellow, often curved into a C-like outline. The seed surface looks smooth without magnification, while detailed microscopy reveals a patterned seed coat. The pale seed colour is one reason this species can be confused with other members of the Baccatum group when only fruits are available.

Scientific accounts and Brazilian culinary use agree that the berries are hot, but pungency does not establish a single reliable Scoville rating for the species. Heat varies by plant and growing line. Figures quoted for particular commercial seed strains should not automatically be used as the definitive SHU for all naturally occurring C. rabenii.

In the field, the ripe red fruit can draw attention away from the flower and foliage, but those parts carry the most reliable identification clues. For identification from a living plant, examining the berry together with its leaf underside and a freshly open flower is much stronger than the fruit alone.

Range & ecology

Capsicum rabenii is native to eastern and central Brazil, from around Bahia in the north-east down through the south-east and south to Rio Grande do Sul, and it extends into central Paraguay. The range includes numerous Brazilian states, such as Bahia, Goiás, Minas Gerais, Espírito Santo, Rio de Janeiro, São Paulo, Paraná, Santa Catarina and Rio Grande do Sul. The distribution maps in the 2022 monograph represent it as a geographically widespread species, rather than one confined to a single reserve or small mountain district.

One reason the species occurs over such a wide area is its ability to grow in quite different vegetation. Records come from the Atlantic Forest, including seasonal and evergreen forest types, as well as drier wooded habitats of the Cerrado and Caatinga. It has been collected along creeks and rivers, in gallery forests, in vegetation over limestone, along forest edges, and in secondary growth or disturbed ground near human activity.

Its recorded elevation spans roughly 100–1,300 metres, with occasional collections near 35 m. Conditions across this range vary considerably in moisture, temperature and seasonal rainfall. The plant is therefore not exclusively a humid-forest pepper or exclusively a dry-forest pepper. It is able to persist in a range of partially sheltered or disturbed habitats, including sites close to farms and settlements.

Botanical records document flowering from November to May. Fruits have been collected mainly between December and May or June, and fruiting can extend into September in cultivation. These dates follow observations from the natural region and growing sites studied by botanists; they do not prescribe an exact calendar for plants cultivated in other countries or climates.

The distinction between truly wild and cultivated stands is sometimes blurred. The monograph reports plants that grow spontaneously, others that appear as escapes from cultivation, and still others planted deliberately in home gardens and small commercial farms. This mixture is part of what makes the species interesting: it occupies a place between wild pepper biodiversity and an enduring human food tradition.

Traditional names & culinary uses

In Brazil, C. rabenii is closely associated with the food tradition of cumari or comari peppers. The fruits are valued for bringing concentrated heat to food despite their very small size. The 2022 monograph records fresh berries sold in markets, as well as their use in pickles, hot sauces and as condiments. Plants are sometimes grown around homes and commercially on small farms.

A remarkable number of names have been recorded from herbarium labels and local usage. In Minas Gerais, examples include comarim, pimenta brava and pimenta de combari. São Paulo collections mention pimenta comary, pimenta camari and pimenta cumarí. Other labels record pimentinha in Santa Catarina, pimenta do mato in Rio Grande do Sul and Espírito Santo, pimenta jorobinha in Rio de Janeiro, and pimenta passarinho in south-eastern Brazil. These names reflect local traditions, not a formal botanical naming system.

The name cumari is not exclusive to C. rabenii. The botanists behind the 2022 revision note that names such as cumari can also apply to C. baccatum, C. chacoense and C. flexuosum. This matters when researching plants, labelling seeds, identifying market fruit or interpreting a recipe: a familiar Portuguese common name does not always identify one exact species.

The practical food use is straightforward. Its small, strongly flavoured berries may be eaten fresh as a spicy addition to meals, preserved in vinegar-based pickles, or incorporated into pepper sauces. The habit of keeping it close to homes helps explain how its wild and cultivated populations overlap. This differs from large-fruited cultivated peppers developed primarily for vegetable-sized pods; here, small fruit and intense flavour are useful traits rather than disadvantages.

Its presence in Brazilian food culture has also been recognised outside botanical literature. In December 2025, Brazil's health regulator Anvisa updated its list of plant species authorised for use as spices. The cumari/comari group includes both Capsicum rabenii and C. baccatum var. baccatum. The accompanying regulatory explanation specifically notes that the older scientific name C. praetermissum was updated to C. rabenii. This provides an unusual example of a taxonomic correction reaching a modern food regulation.

In Paraguay, the monograph reports the species as less common and its fruits as less valued for eating than in Brazil. That is a regional observation about documented use, not evidence that the berries are biologically different there. Across Brazil, the local names and culinary uses show that the plant is both a genuinely wild chilli and an ingredient with a recognised regional identity.

Genetics & relationships

DNA research places Capsicum rabenii in the Baccatum evolutionary group, alongside C. baccatum and C. chacoense. It is therefore much closer to the wild and domesticated ají peppers than to the Atlantic Forest species with black seeds and greenish-gold fruit, or the wild Andean peppers with more bell-shaped yellow flowers.

Like its close relatives, it has 24 chromosomes in ordinary body cells (2n = 24) and 12 in its reproductive cells. Those counts were reported in studies that often used the older names C. praetermissum or C. baccatum var. praetermissum. Understanding the synonymy is essential for finding and interpreting the genetics literature.

The 2016 phylogenetic study by Carrizo García and colleagues and later work on chilli diversification help place the species within the broader evolutionary history of Capsicum. Those studies do not support simply treating it as an ordinary wild form of C. baccatum. Combined with its distinct leaf pubescence and flower pigmentation, the genetic evidence supports recognising C. rabenii as its own species.

Breeding studies also provide an intriguing clue about its relationships. Heiser and Smith's 1958 work documented controlled reciprocal crosses involving the plant they called C. praetermissum and other peppers, including C. baccatum and C. frutescens. Some crosses produced fruit containing viable seeds. That demonstrates a degree of experimental compatibility, but does not establish that natural hybrids are common. The 2022 authors explicitly noted that they had not observed intermediate plants amongst those species in the field.

For pepper breeding, a wild, pungent species that can be crossed with other members of the genus may be a useful source of genetic diversity. Its small fruit, distinctive floral pigment, growth habit and hairy foliage all offer traits of scientific interest. Any proposal to use a particular trait in breeding still requires testing in actual crosses and later generations; genetic relatedness alone does not guarantee successful transfer.

Identification & similar species

Because it is a small, red-fruited member of the Baccatum group, C. rabenii has sometimes been misidentified as Capsicum baccatum var. baccatum. Even herbarium specimens can be difficult to name when the flowers are missing, because both bear small upright orange or red fruits, relatively long-stalked leaves, and pale seeds.

The most dependable difference is the combination of flower colour and leaf hairs. C. rabenii normally has a purple or lilac band at the corolla edge, with yellowish-green markings nearer the centre. C. baccatum var. baccatum has a mainly white corolla marked with greenish-yellow areas, without that usual purple marginal band. On the leaves, C. rabenii normally has more conspicuous woolly hair along the lower veins and tufts where veins meet. Wild C. baccatum is generally less hairy beneath.

A second lookalike is C. chacoense, which overlaps geographically in Paraguay. Its flowers tend to be smaller, clearly star-shaped and uniformly white. The leaf undersides do not show the same combination of long woolly hairs and dense vein-axil tufts. Furthermore, its flower and calyx details differ, including its often more numerous calyx projections.

The occasional all-white flower of C. rabenii and the less hairy populations from Goiás show why a single trait cannot settle every case. The 2022 monograph itself discusses both exceptions. When possible, examine a whole flowering and fruiting branch, including the leaf underside, flower coloration, stalk bend, calyx and ripe fruit position. Botanical identification is strongest when a combination of characters agrees.

Commercial plants sold under old labels such as C. praetermissum may indeed represent C. rabenii, but the name printed on a packet is not itself a specimen-level identification. Likewise, peppers simply sold as cumari can belong to different species. Correct naming is especially valuable if plants are being compared for research, shared as seed accessions or included in a species database.

Conservation

The 2022 Capsicum monograph assigned Least Concern (LC) as its preliminary conservation assessment for C. rabenii. The researchers calculated an extent of occurrence of about 2.75 million km² and a much smaller area of occupancy of about 404 km², based on mapped collection records. Those two measures describe different things: the broad geographical envelope of recorded populations and the grid area occupied by documented sites.

The authors considered the species relatively secure because of its large range, tolerance of disturbed habitats, ability to occur around settlements and continued cultivation. They did not describe it as being under immediate threat across its entire distribution. This is the authors' published preliminary assessment, not a claim of an independently verified official IUCN Red List entry.

There is still a conservation reason to maintain naturally occurring populations. Cultivated plants and wild plants do not necessarily preserve the same genetic variety, and their ecological settings differ. Protecting the forests, wooded corridors and other habitats where C. rabenii survives allows the species' natural diversity to persist alongside the forms selected by local growers.

Capsicum rabenii is unusual among wild pepper species because its natural range, visible distinctive features and established food uses are all well documented. Its story also illustrates why botanical naming matters: the plant did not change when the name C. praetermissum fell into synonymy, but the restored 1846 identity has helped unify historical collections, genetics papers, cultivated forms and modern regulations under one accepted species name.