Peperomia

Peperomia is one of the two large genera of the family Piperaceae. It is estimated that there are at least over 1,000 species, occurring in all tropical and subtropical regions of the world. They are concentrated in South and Central America, but may also be found in the southern North America, Caribbean islands, Africa, Oceania, and southern and eastern parts of Asia. The exact number of species is difficult to determine, as some plants have been recorded several times with different names, and new species continue to be discovered. Peperomias have adapted to many different environments and their appearances vary greatly. Some are epiphytes (growing on other plants) or lithophytes (growing on rock or in rock crevices), and many are xerophytes (drought-tolerant, with thick succulent structures to save water) or possess underground tubers (geophytes). Most species are compact perennial shrubs or vines.[1][2]

Peperomia
Peperomia trifolia
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Magnoliids
Order: Piperales
Family: Piperaceae
Subfamily: Piperoideae
Genus: Peperomia
Ruiz & Pav.
Species

Over 1,000, see List of Peperomia species

Some Peperomias have thick, waxy, succulent leaves and stems; still, others are rather delicate, with paper-thin leaves. Many species will easily sunburn, preferring filtered or indirect, bright sunlight. Most of the Peperomias have minimal to virtually non-existent root systems (species-depending), with the entire mass often being nothing more than a collection of tiny, hair-like appendages used to anchor the plant. These roots, while delicate, also enable the plants to survive in less-than-ideal conditions; however, their fragility also places them at a greater risk for root rot if water does not drain sufficiently quickly.

The genus name Peperomia was coined by Spanish botanists Ruiz López and Pavón Jiménez in 1794 after their travels in Perú and Chile.[3] Peperomia plants do not have a widely- accepted common name, and some argue that it is better to use the genus name, as is the case with genera such as Petunia and Begonia.[4] They are sometimes called radiator plants, a name possibly coined by L.H. Bailey because many of them enjoy bright and dry environments similar to a windowsill above a radiator.[3] Furthermore, many individuals simply refer to the many Peperomias by their individual nicknames, such as Peperomia polybotrya being called the “Raindrop Peperomia” (due to its large, drop-shaped leaves), or P. argyreia being the “Watermelon Peperomia”, due to its leaf veining and shape resembling the look of a watermelon.

Description

Peperomias vary considerably in appearance (see gallery below) and there is no universally accepted method of categorising them, although three main groups can be distinguished.[1] Most species are compact and usually do not exceed 30 cm (12 in) in height.

First are plants with decorative foliage, which often grow in rain or clouds forests as epiphytes. They are adapted to living in small shady crevices on, for example, trees, with small root systems. As they do not have access to ground water they are typically succulent to a certain degree which in many species shows as thick, fleshy leaves, which have a waxy surface and are sometimes rippled. The leaves may be oval with the leafstalk at or near the center of the leaf blade, or they may be heart-shaped or lance-shaped; their size varies from 2.5–10 cm (1–4 in) long. They may be green or striped, marbled or bordered with pale green, red or gray, and the petioles of some kinds are red. They also enjoy high air humidity, warm temperatures, and grow all year round. Examples include P. argyreia, P. caperata, P. nitida, P. obtusifolia, P. polybotrya, and P. scandens.[1][2]

The second group consists of more arid-climate, succulent peperomias, which are often found in higher altitudes. They are adapted to withstanding a long warm season followed by a colder winter and very little rainfall. They store water both in their stout stems and in their succulent leaves, which typically form a sort of “tube” or “burrito”, appearing U- or V-shaped in cross-section, often with epidermal windows on the top-side. P. columella, P. ferreyrae, P. graveolens and P. nivalis fall into this category.[1][5]

The third group contains geophytic peperomias. These plants have leaves that fall off in the colder dry season, survive due to their underground tubers, and grow the leaves back as more rain falls. Examples include P. macrorhiza, P. peruviana, and P. umbilicata.[1][6] Currently just under 50 species of geophytic peperomias are known, but new ones continue to be discovered.[7]

Peperomia flowers are typically unnoticeable, growing in cordlike spikes, although there are some exceptions such as P. fraseri. Most peperomia flowers seem odorless to humans but some carry a musty or even unpleasant odor, such as P. graveolens. The fruit is a berry that eventually dries out and shows the tiny pepper-like seed.[2]

Species
Main article: List of Peperomia species

There are over a thousand Peperomia species, although the exact number is unclear as some plants have been recorded several times with different names (c. 3,000 names have been used in publications) and new species continue to be discovered.[1][2] At the moment Catalogue of Life lists around 1,400 recognized species.[8]

Distribution

Peperomias are found in tropical and sub-tropical regions around the world. Northern South America and Central America host the largest number of species, but peperomias can also be found in Africa, southern Asia, and Oceania. The exact number of peperomia species continues to change as new plants are discovered and some distinct plant names, perhaps catalogued in separate geographical regions, are realised to describe the same species.[9] Therefore the table below gives only a rough overall impression of the worldwide distribution.

Distribution of peperomia species[9]
AreaTaxaExamples of endemic species (based on POWO)
Peru405P. andina, P. dolabella, P. dolabriformis, P. macrorhiza, P. metallica, P. minuta, P. nivalis, P. rubescens, P. verschaffeltii
Colombia259P. abbreviatipes, P. cordata, P. dimota, P. perciliata, P. turboensis
Ecuador237P. graveolens, P. albovittata, P. cuspidilimba, P. fagerlindii, P. rugosa
Costa Rica155P. barbulata, P. dyscrita, P. hammelii, P. incognita, P. vinasiana
Mexico139P. camptotricha, P. hobbitoides, P. oxycarpa, P. tuberosa, P. xalana
Brazil[10]117P. caperata, P. flexicaulis, P. griseoargentea, P. marmorata, P. nudifolia, P. ramboi
Caribbean Islands[11]72P. clusiifolia, P. cubensis, P. verticillata
Pacific Islands (other than mentioned)[12]45P. attenuata, P. mariannensis, P. tutuilana
Madagascar42P. ankaranensis, P. humbertii, P. mocquerysii
Hawaii[13]22P. cookiana, P. kipahuluensis, P. obovatilimba
Africa (continental)21P. fernandopoiana, P. kamerunana, P. vulcanica
Philippines18P. copelandii, P. elmeri, P. recurvata
Papuasia[14]18P. bismarckiana, P. peckelii, P. schlechteri
India[15]11P. ekakesara, P. emarginatifolia, P. thomsonii
Southeast Asia (Indo-China)[16]7P. masuthoniana, P. sirindhorniana, P. thorelii
Australia5P. bellendenkerensis, P. hunteriana, P. × enervis

Note that many peperomias are found in wide overlapping regions, for example everywhere in tropical America or Asia, and so may have not been included in the species count for individual areas.

Peperomias and humans

Horticulture

Peperomias are often grown for their ornamental foliage and many species are considered easy to grow in homes and greenhouses. Several species have been given the Award of Garden Merit by the Royal Horticultural Society.[17] Peperomias are largely considered non-toxic and are often recommended for households with children or animals.[18][19]

Out of the 1,000+ Peperomia species, currently only about 40 of them are commonly used as houseplants. These peperomias fare well in average home conditions and can relatively easily be found in stores and garden centers. Species in this basic group include P. alata, P. albovittata, P. argyreia, P. blanda, P. boivinii, P. caperata, P. clusiifolia, P. columella, P. dolabriformis, P. ferreyrae, P. fraseri, P. glabella, P. graveolens, P. griseoargentea, P. hoffmannii, P. incana, P. japonica, P. kimnachii, P. maculosa, P. metallica, P. nitida (often sold as P. scandens), P. nivalis, P. obtusifolia, P. pellucida, P. perciliata, P. pereskiifolia, P. polybotrya, P. prostrata, P. quadrangularis (syn. P. angulata), P. rotundifolia, P. rugosa, P. tetragona (syn. P. puteolata), P. tetraphylla, P. turboensis, P. urocarpa, P. verschaffeltii, P. verticillata (syn. P. rubella), and P. wheeleri.

There can be, however, several cultivars available from each species. Identifying species can be challenging as plants are often sold under marketing names, older synonyms, or under names that have not been officially accepted. This is the case, for example, with Peperomia orba (often sold as Peperomia 'Pixie'), Peperomia viridis, and Peperomia axillaris. In addition to natural species and their cultivars, some artificial hybrid varieties can also be found on the market, such as Peperomia 'Hope' (a cross between P. deppeana and P. quadrifolia).[20]

Most species need airy, well-draining substrate and want to dry out to some extent or even completely between waterings. A typical reason for losing a peperomia is through root rot caused by over-watering.[1] The tropical, decorative foliage plants, typically enjoy shadier conditions with more humidity. Some might even require a terrarium or a bottle garden to maintain high humidity. The arid climate succulent types should be treated similarly to cacti and other succulents: they can tolerate more light and will survive a dry cold period, during which they are watered only seldomly. The geophytic peperomias are used to experiencing a cold resting period once a year.[1]

Food and medicine

Many peperomias are herbs in the sense that their leaves carry a spicy flavour and, when crushed, emit a strong odour. Because of this some species, such as Peperomia pellucida are used in salads and cooking, or to flavour drinks.[21][4] Some, including Peperomia inaequalifolia and Peperomia congona, are also used in herbal medicine as digestives, for their anti-inflammatory and wound-healing qualities, or as drops against otitis and conjunctivitis.[22] While such folk medicine usage is common in Peru and elsewehere the possible medicinal qualities of peperomias remain poorly investigated, although there has been a growing interest for the subject recently.[23] For the moment, it is advised that people should not try to eat the peperomias sold as houseplants.[24]

Propagation

These plants can be propagated by seeds, by cuttings, or by dividing. Peperomia cuttings of many species root easily.[25]

Plants can be divided and repotted. They are removed and separated into smaller pieces, each with a few roots attached. Leaf or stem cuttings can also be taken in the spring or summer. The lower leaves of the shoots are removed and a cut is made below the bottom node (joint). They are then laid on a bench for an hour or two to allow a protective callus tissue to form over the cuts. They are then inserted in a propagating case with bottom heat of 21–24 °C (70–75 °F). It is best not to seal the top completely, as the plants are semi-succulent in nature and excessive humidity is detrimental. When enough roots have formed, cuttings can be planted in 75 mm (3 in) pots or in hanging baskets.

Examples of tropical, decorative foliage types

Examples of arid climate succulent types

Examples of geophytic peperomias

See also

References
  1. Mathieu, G. "Internet Peperomia Reference". Retrieved 28 April 2022.
  2. Rowley & Rauh (2001). "Pep for plantsmen – Part 1, Scrutinizing Peperomia". British Cactus & Succulent Journal. 19 (3): 151–155. Retrieved 28 April 2022.
  3. Crawford, Bruce. "Peperomia: Foliage for the Holidays". Rutgers University. Retrieved 10 May 2022.
  4. Heiser, Charles Bixler (1985). Of Plants and People. Norman: University of Oklahoma Press. pp. 155–162. ISBN 0-8061-1931-4.
  5. Rowley & Rauh (2002). "Pep for plantsmen – Part 3, the window-leaved peperomias". British Cactus & Succulent Journal. 20 (1): 43–49. Retrieved 28 April 2022.
  6. Rowley & Rauh (2001). "Pep for plantsmen – Part 2, the geophytic peperomias". British Cactus & Succulent Journal. 19 (4): 200–205. Retrieved 28 April 2022.
  7. Mathieu, G. "Focus on new geophytic Peperomias". Internet Peperomia Reference. Retrieved 20 May 2022.
  8. "Search for accepted Peperomia species". Plants of the World Online. Royal Botanical Gardens Kew. Retrieved 28 December 2022.
  9. Mathieu, G. "Focus on how many Peperomias?". Internet Peperomia Reference. Retrieved 6 July 2022.
  10. Carvalho-Silva, M; Guimarães, EF; Câmar, PEAS (2013). "New Species of Peperomia (Piperaceae) from Brazil". Systematic Botany. 38 (3): 571–575. doi:10.1600/036364413X670412.
  11. "Peperomia in Caribbean Islands". Plants of the World Online. Royal Botanical Gardens Kew. Retrieved 7 July 2022.
  12. "Peperomia in Pacific Islands". Plants of the World Online. Royal Botanical Gardens Kew. Retrieved 7 July 2022.
  13. "Peperomia in Hawaii". Plants of the World Online. Royal Botanical Gardens Kew. Retrieved 7 July 2022.
  14. "Peperomia in Papuasia". Plants of the World Online. Royal Botanical Gardens Kew. Retrieved 7 July 2022.
  15. Thomas, A; Jameson, J (2022). "Peperomia albertiae (Piperaceae), a new species from India". Kew Bulletin. 77 (1): 341–346. doi:10.1007/S12225-022-10006-7.
  16. "Peperomia in Indo-China". Plants of the World Online. Royal Botanical Gardens Kew. Retrieved 7 July 2022.
  17. "Award of Garden Merit (AGM)". The Royal Horticultural Society. Retrieved 19 May 2022.
  18. "Toxic and Non-Toxic Plant List - Cats". American Society for the Prevention of Cruelty to Animals. Retrieved 17 April 2021.
  19. "Safe Plants For Early Childhood Services". Aussie Childcare Network. Retrieved 13 May 2022.
  20. "Peperomia 'Hope'". World of Succulents. Retrieved 5 July 2022.
  21. "Peperomia". Eat The Weeds. Retrieved 13 May 2022.
  22. Pino, Guillermo (2010). "Alte und neue Namen der sukkulenten Arznei-Peperomias aus Peru". Avonia. 28 (2): 39–54.
  23. Gutierrez, Y.; Yamaguchi, L.; de Moraes, M.; Jeffrey, C.; Kato, M. (2016). "Natural products from Peperomia: occurrence, biogenesis and bioactivity". Phytochemistry Reviews. 15: 1009–1033. doi:10.1007/s11101-016-9461-5.
  24. Dei, Laure. "Ask A Master Gardener – Peperomia: An Easy Growing Houseplant". University of Wisconsin-Madison. Retrieved 13 May 2022.
  25. R.W. Henley; L.S. Osborne; A.R. Chase. "Peperomia Production Guide". University of Florida, IFAS. Retrieved 10 October 2021.
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