The genus Kalanchoe Adans. (Crassulaceae) is the largest genus of the subfamily Kalanchoideae (= Cotyledonoideae sensu Smith & Monro, 2024) and one of the most important in the family Crassulaceae, with approximately 176 accepted species according to Plants of the World Online (POWO, December 2025). The generic name was published by Michel Adanson in 1763 in his Familles des Plantes, and probably derives from the Cantonese 伽藍菜 (gālàahm choi), a name applied to Asian species of the genus.
The taxonomic history of the genus is marked by a century-long debate over the status of the genus Bryophyllum Salisb. (1805) and the genus Kitchingia Baker (1881). Bryophyllum was distinguished by its capacity for vegetative reproduction through marginal leaf bulbils (phyllo-bulbiliferous) and its pendulous tubular corollas. Kitchingia grouped Malagasy species with campanulate flowers. Molecular phylogenetic analyses (Gehrig et al., 2001; Smith & Figueiredo, 2018; Rodewald et al., 2025) have shown that Bryophyllum and Kitchingia are nested within Kalanchoe, confirming their treatment as subgenera rather than distinct genera.
The most recent and comprehensive phylogeny is that of Rodewald et al. (2025, Annals of Botany 135: 1311–1328), based on ddRADseq sequencing of 70% of the genus’s taxa. Five subgenera are currently recognised: Kalanchoe subg. Kalanchoe, Kalanchoe subg. Bryophyllum (Salisb.) Koord., Kalanchoe subg. Kitchingia (Baker) Gideon F.Sm. & Figueiredo, Kalanchoe subg. Alatae (Gideon F.Sm.) Raym.-Hamet ex Gideon F.Sm., and Kalanchoe subg. Calophygia Desc. emend. Gideon F.Sm. The reference monograph for southern Africa is that of Smith, Figueiredo & van Wyk (2019, Kalanchoe [Crassulaceae] in Southern Africa, Academic Press).
Distribution
The genus Kalanchoe is distributed throughout the tropical and subtropical Old World, with two major centres of diversity: Madagascar (approximately 60 endemic species) and sub-Saharan Africa (approximately 56 species). The phylogeny of Rodewald et al. (2025) suggests a Malagasy origin for the genus, with a single dispersal event to the African mainland, followed by secondary dispersals to the Arabian Peninsula and Southeast Asia, reaching as far as north-western Australia.
All subgenera except the autonymic subgenus Kalanchoe are endemic to Madagascar. Subgenus Kalanchoe is the only one with a predominantly continental African distribution, extending to the Arabian Peninsula (Yemen, Oman), the Indian subcontinent, Southeast Asia (Myanmar, Thailand, southern China, Philippines, Indonesia) and north-western Australia. A single species, Kalanchoe pinnata (Lam.) Pers., is reported as native to the Americas (though this attribution is debated; it may be an ancient introduction from Africa).
Several species have become pantropical and invasive, particularly Kalanchoe pinnata, Kalanchoe daigremontiana Raym.-Hamet & H.Perrier, Kalanchoe delagoensis Eckl. & Zeyh. (syn. Kalanchoe tubiflora) and their hybrid Kalanchoe × houghtonii D.B.Ward. These phyllo-bulbiliferous species of subgenus Bryophyllum aggressively colonise disturbed habitats in tropical and Mediterranean zones, and are listed as invasive alien species in many countries.
Ecology and Biology
Kalanchoe species are perennial (rarely annual or biennial), herbaceous to shrubby succulents, with a few species reaching arborescent dimensions (Kalanchoe beharensis Drake, up to 20 ft / 6 m tall in Madagascar). The leaves are opposite, fleshy, often crenate or dentate, sometimes covered with glandular, stellate or felted hairs. The flowers are typically tetramerous, with a fused tubular corolla, pendulous or erect, in colours ranging from white to bright red through yellow, orange and pink.
The most remarkable biological trait of the genus is vegetative reproduction through marginal leaf bulbils (phyllo-bulbiliferous), a characteristic of subgenus Bryophyllum. These miniature plantlets, formed on the leaf crenulations, detach and root on contact with the soil. The phylogeny of Rodewald et al. (2025) showed that this trait evolved only once, within a restricted clade of subgenus Bryophyllum. Other species produce bulbils in the post-anthesis inflorescence (floral vivipary), a trait more widely distributed across the genus.
Kalanchoe species typically flower in response to photoperiodism: they are short-day plants, flowering naturally in winter or early spring. This property is exploited industrially in Kalanchoe blossfeldiana Poelln. and its hybrids, which represent a horticultural market worth several hundred million euros annually. Pollination is entomophilous (bees, butterflies) or ornithophilous (sunbirds in Africa) depending on floral morphology.
Adaptations to Aridity and CAM Photosynthesis
The genus Kalanchoe is a major model system for the study of Crassulacean Acid Metabolism (CAM). The genome of Kalanchoe fedtschenkoi Raym.-Hamet & H.Perrier has been sequenced as a model for studying the evolution of CAM in Crassulaceae. The expression of CAM varies considerably within the genus, ranging from near-C3 behaviour to strong constitutive CAM, through drought-inducible facultative CAM.
Adaptations to aridity include: leaf and stem succulence, thick cuticle (often pruinose or tomentose), CAM metabolism reducing transpiration, dense tomentosity (stellate hairs in subgenus Calophygia, providing protection against UV radiation and reducing water loss), and rapid vegetative reproduction enabling colonisation of new substrates without dependence on pollinators. Malagasy species of the dry south-western forests show the most pronounced xeric adaptations (Kalanchoe beharensis, Kalanchoe orgyalis Baker, Kalanchoe tomentosa Baker).
Infrageneric Classification and Species List
The classification follows the work of Smith & Figueiredo (2018), Smith (2021, 2022, 2023, 2024), and the phylogeny of Rodewald et al. (2025). Five subgenera are recognised, corresponding to four major clades in the ddRADseq phylogeny (subgenera Kitchingia and part of Bryophyllum together form clade B). The species list is based on POWO (Kew, 2025, ~176 accepted species).
Subgenus Kalanchoe
The autonymic subgenus Kalanchoe (corresponding to clade D of Rodewald et al., 2025) is the only subgenus with a predominantly continental African distribution, extending to the Arabian Peninsula, Southeast Asia and north-western Australia. A few species are indigenous to Madagascar. The flowers are typically erect, with a tubular corolla bearing 4 spreading lobes. This is the most species-rich subgenus (~80 species). It includes the most important species in horticulture (Kalanchoe blossfeldiana) and traditional medicine (Kalanchoe crenata).
Representative species: Kalanchoe alternans (Vahl) Pers., Kalanchoe ballyi Raym.-Hamet ex Cufod., Kalanchoe benbothae Gideon F.Sm. & N.R.Crouch, Kalanchoe bentii C.H.Wright ex Hook.f., Kalanchoe bipartita Chiov., Kalanchoe blossfeldiana Poelln., Kalanchoe brachyloba Welw. ex Britten, Kalanchoe ceratophylla Haw., Kalanchoe chevalieri Gagnep., Kalanchoe citrina Schweinf., Kalanchoe crenata (Andrews) Haw., Kalanchoe crundallii I.Verd., Kalanchoe deficiens (Forssk.) Asch., Kalanchoe densiflora Rolfe, Kalanchoe farinacea Balf.f., Kalanchoe glaucescens Britten, Kalanchoe globulifera H.Perrier, Kalanchoe grandiflora A.Rich., Kalanchoe integra (Medik.) Kuntze, Kalanchoe laciniata (L.) DC., Kalanchoe lateritia Engl., Kalanchoe laxiflora Baker, Kalanchoe longiflora Schltr. ex J.M.Wood, Kalanchoe luciae Raym.-Hamet, Kalanchoe marmorata Baker, Kalanchoe mitejea H.Perrier, Kalanchoe nyikae Engl., Kalanchoe obtusa Engl., Kalanchoe paniculata Harv., Kalanchoe prittwitzii Engl., Kalanchoe pumila Baker, Kalanchoe quartiniana A.Rich., Kalanchoe robusta Balf.f., Kalanchoe rotundifolia (Haw.) Haw., Kalanchoe schimperiana A.Rich., Kalanchoe sexangularis N.E.Br., Kalanchoe stellata Guillaumin, Kalanchoe tetraphylla H.Perrier, Kalanchoe thyrsiflora Harv., Kalanchoe velutina Welw. ex Britten, Kalanchoe zimbabweensis Rendle.
Subgenus Bryophyllum (Salisb.) Koord.
Subgenus Bryophyllum (corresponding primarily to clade C of Rodewald et al., 2025) is endemic to Madagascar. It is the subgenus most familiar to the general public due to its phyllo-bulbiliferous species, commonly known as ‘mother of thousands’. The flowers are typically pendulous, with a swollen tubular corolla often coloured red, orange or purple. The phylogeny shows that the formation of marginal leaf bulbils evolved only once, within a restricted clade including Kalanchoe daigremontiana, Kalanchoe delagoensis, Kalanchoe laetivirens Desc. and Kalanchoe pinnata (section Invasores sensu Boiteau). Several species are highly invasive in tropical and subtropical regions worldwide.
Representative species: Kalanchoe beauverdii Raym.-Hamet, Kalanchoe × bosseri Raym.-Hamet & H.Perrier, Kalanchoe campanulata (Baker) Baill., Kalanchoe costantinii Raym.-Hamet, Kalanchoe daigremontiana Raym.-Hamet & H.Perrier, Kalanchoe delagoensis Eckl. & Zeyh., Kalanchoe dinklagei Raym.-Hamet, Kalanchoe fedtschenkoi Raym.-Hamet & H.Perrier, Kalanchoe gastonis-bonnieri Raym.-Hamet & H.Perrier, Kalanchoe × houghtonii D.B.Ward, Kalanchoe jongmansii Raym.-Hamet & H.Perrier, Kalanchoe laetivirens Desc., Kalanchoe laxiflora Baker, Kalanchoe manginii Raym.-Hamet & H.Perrier, Kalanchoe mortagei Raym.-Hamet & H.Perrier, Kalanchoe perrieri Raym.-Hamet, Kalanchoe pinnata (Lam.) Pers., Kalanchoe prolifera (Bowie ex Hook.) Raym.-Hamet, Kalanchoe rosei Raym.-Hamet & H.Perrier, Kalanchoe suarezensis H.Perrier, Kalanchoe tubiflora (Harv.) Raym.-Hamet, Kalanchoe uniflora (Hilsenb. & Bojer ex Tul.) Raym.-Hamet, Kalanchoe variifolia Desc.
Subgenus Kitchingia (Baker) Gideon F.Sm. & Figueiredo
Subgenus Kitchingia (part of clade B of Rodewald et al., 2025, together with section Pubescentes of subgenus Bryophyllum) is endemic to Madagascar. It currently comprises only two species, characterised by distinctive campanulate flowers and a bushy habit. The species grow in humid forests and high-altitude areas of the Malagasy central highlands. The phylogeny indicates that clade B forms a natural unit, but the boundaries between subgenera Kitchingia and Bryophyllum require reassessment.
Species: Kalanchoe gracilipes Baill., Kalanchoe peltata Baill.
Subgenus Alatae (Gideon F.Sm.) Raym.-Hamet ex Gideon F.Sm.
Subgenus Alatae is the smallest subgenus, endemic to Madagascar. It comprises only two species, Kalanchoe porphyrocalyx (Baker) Baill. and Kalanchoe uniflora (Hilsenb. & Bojer ex Tul.) Raym.-Hamet, notable for their pendulous or trailing stems and flowers often solitary or in small clusters. Kalanchoe uniflora is a semi-epiphytic species highly prized as a hanging basket plant. This subgenus was not included in the ddRADseq phylogeny of Rodewald et al. (2025) due to the unavailability of fresh material.
Species: Kalanchoe porphyrocalyx (Baker) Baill., Kalanchoe uniflora (Hilsenb. & Bojer ex Tul.) Raym.-Hamet.
Subgenus Calophygia Desc. emend. Gideon F.Sm.
Subgenus Calophygia (corresponding to clade A of Rodewald et al., 2025) is endemic to Madagascar. It groups the so-called ‘woody clade’ species, generally shrubby or arborescent, often covered with a dense tomentum of stellate or glandular hairs on all surfaces. This is where the largest species of the genus are found, such as Kalanchoe beharensis Drake (up to 20 ft / 6 m), with its large felted leaves shaped like elephant ears. Subgenus Calophygia, published by Descoings in 2006, was reinstated and amended by Smith (2023) to retain only the woody clade species.
Representative species: Kalanchoe arborescens Humbert, Kalanchoe beharensis Drake, Kalanchoe bracteata Scott-Elliot, Kalanchoe gastonis-bonnieri Raym.-Hamet & H.Perrier, Kalanchoe grandidieri Baill., Kalanchoe hildebrandtii Baill., Kalanchoe millotii Raym.-Hamet & H.Perrier, Kalanchoe orgyalis Baker, Kalanchoe rhombopilosa Mannoni & Boiteau, Kalanchoe synsepala Baker, Kalanchoe tomentosa Baker.
Horticultural and Economic Importance
Kalanchoe blossfeldiana and its hybrids constitute one of the world’s most important flowering houseplant markets, with hundreds of millions of pots sold annually, particularly in Europe, Asia and North America. Modern cultivars offer a range of flower colours (red, pink, salmon, orange, yellow, white, bicolour) and forms (single, double, ‘rose’). Kalanchoe tomentosa (‘panda ears’), Kalanchoe beharensis (‘elephant ear’), Kalanchoe luciae (‘paddle plant’) and Kalanchoe thyrsiflora are among the most popular ornamental succulent species.
In traditional medicine, Kalanchoe pinnata, Kalanchoe crenata and Kalanchoe daigremontiana are widely used in Africa, Asia and South America for the treatment of wounds, burns, infections and chronic diseases. Bufadienolides and flavonoids isolated from these species have demonstrated anti-tumour, sedative and cardiotonic activities.
Major Botanical Collections
Parc Botanique et Zoologique de Tsimbazaza, Antananarivo, Madagascar. Reference living collection for Malagasy species.
Royal Botanic Gardens, Kew (K), United Kingdom. Major historical herbarium with type specimens by Baker, Raym.-Hamet, Perrier and Descoings. POWO database serving as the global reference.
Muséum National d’Histoire Naturelle, Paris (P), France. Herbarium containing the historical collections of Perrier de la Bâthie, Humbert and Descoings for Madagascar.
Botanischer Garten Berlin-Dahlem, Germany. Important living collection of Kalanchoe, including rare Malagasy taxa. Part of the phylogenetic sampling by Rodewald et al. was conducted here.
National Herbarium of South Africa (PRE), Pretoria, SANBI. Reference collection for southern African species, complemented by the monograph of Smith, Figueiredo & van Wyk (2019).
Sukkulenten-Sammlung Zürich, Switzerland. Major living collection of Crassulaceae, with numerous Kalanchoe species and cultivars.
Jardin Exotique de Monaco. Remarkable Mediterranean collection, including mature specimens of Kalanchoe beharensis and other Malagasy species.
Authority Sites and Online Resources
Plants of the World Online (POWO) — Royal Botanic Gardens, Kew
https://powo.science.kew.org/…
International Crassulaceae Network (ICN) — Kalanchoe
https://www.crassulaceae.ch/…
PlantZAfrica — South African National Biodiversity Institute (SANBI)
https://pza.sanbi.org/
iNaturalist — Kalanchoe observations
https://www.inaturalist.org/taxa/47910-Kalanchoe
World of Succulents — Kalanchoe
https://worldofsucculents.com/genera/kalanchoe/
LLIFLE — Encyclopedia of Living Forms
https://www.llifle.com/Encyclopedia/…
GBIF — Global Biodiversity Information Facility
https://www.gbif.org/
Tropicos — Missouri Botanical Garden
https://www.tropicos.org/
Biodiversity Heritage Library (BHL)
https://www.biodiversitylibrary.org/
Bibliography
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