Global diversity of Cinnamomum and conservation: what the Red List species review shows

The most immediate finding is that the Cinnamomum genus encompasses a wide diversity, with evergreen tree and shrub species found in tropical and subtropical zones. In the review, 195 of the 230 taxa analyzed are identified as being in urgent need of conservation. This indicates a widespread critical situation, not the imminent extinction of every single species.

The authors emphasize that for many botanical entities, there is insufficient information regarding specific threats, ecological needs, reproduction, and protection strategies. They therefore point to the need to adopt complementary interventions: in situ conservation (protection of populations in their natural environment) and ex situ conservation (preservation of seeds, tissues, or plants outside their natural environment). They cite controlled germination and somatic embryogenesis, a technique by which plant cells can form embryos in culture. These are options to be adapted to each individual species, not universal solutions.

This work is relevant because it clarifies a step that is often overlooked: a botanical genus is not equivalent to a single raw material or a single plant population. Correctly identifying species allows us to distinguish the food product from other related plants and to recognize that some may have very different conservation needs.

The outlined sequence adopts a cautious approach:

-a restricted or fragmented distribution can increase the need for conservation attention;

-more robust taxonomic and genetic data then help define which populations to protect;

-only afterwards can targeted measures be planned;

Studies on specific Cinnamomum species show, in fact, that fragmentation, low gene flow, and difficulty in regeneration may require differentiated interventions [1,2,3].

The 2026 publication by Mohandass and colleagues is a review, not a field observation conducted by the authors on all 230 entities considered. Its conclusions therefore depend on the completeness, currency, and comparability of the assessments found in the IUCN Red List. The work does not provide a new, uniform estimate of population numbers for each taxon.

Furthermore, a risk status does not automatically describe genetic diversity, i.e., the variety of the hereditary heritage within a species. Genetic diversity can influence the ability to adapt, but it requires dedicated assessments. Nor does the number of taxa in need of protection demonstrate that all aromatic species used commercially are rare or threatened. To reach conclusions about a specific species or product, verifiable botanical identification and targeted data are required.

The available evidence supports the general premise that the conservation of Cinnamomum must be evaluated on a species-by-species basis. In an experimental study on 54 individuals of Cinnamomum chago, Dong and colleagues observed five isolated populations and a high proportion of genetic variability within the populations. The result confirms that fragmented distribution and local biological characteristics must be included in conservation planning; however, it remains specific to a single species [1].

A subsequent genetic study on five populations of the same species found low genetic diversity, strong differentiation between populations, evidence of a demographic bottleneck, and very limited gene flow. In simple terms, reproductive exchanges between groups were limited. This supports the idea of combining habitat protection and reproductive management, without demonstrating that the same pattern applies to the entire genus [2].

A third experimental study analyzed the seed dormancy of Cinnamomum migao. With three replicates of 50 seeds per treatment, the combination of stratification at 15 °C and gibberellic acid brought final germination to 77.33 ± 4.16%. The data show that specific protocols can improve the propagation of some threatened species, consistent with the options discussed by Mohandass and colleagues; it does not constitute proof for all Cinnamomum species [3].

There are findings that suggest we should not oversimplify the link between classification, risk status, and conservation. In a molecular study of eight Cinnamomum species, with three samples per species, the standard plant markers rbcL, matK, and trnH-psbA did not reliably distinguish between all species. This limits the use of a single genetic method for identifying botanical material and supports the need to integrate morphology with more informative genomic data [4].

In a synthesis of 919 taxa and 5,271 populations, Mastretta-Yanes and colleagues also found that genetic indicators can signal critical issues not captured by Red List status. This evidence does not contradict the necessity of IUCN assessments, but it indicates that they are not sufficient on their own to describe the genetic status of populations [5]. No directly conflicting evidence sufficiently relevant to the number of taxa reported by Mohandass and colleagues has been identified; this does not prove the absence of contrary results.