The most recent Singapore flora checklist was published in May 2022 by the Singapore Botanic Gardens. It was noticed in January 2023 during research on Ruellia blechum (Green Shrimp Plant). This new flora checklist was then noted as an update to the May 2016 note, which referenced the previous version of the flora checklist published in 2009.

This brief note will function as the landing page for referencing this checklist on my website. The rationale behind this decision mirrors that of the 2009 flora checklist note: to accommodate any potential changes in the URL over time for this frequently cited publication. The official citation for the current checklist is as follows:

Lindsay, S., Middleton, D.J., Ho, B.C., Chong, K.Y., Turner, I.M., Ali Ibrahim, Alonso-García, M., Ang, W.F., Ashton, P.S., Athen, P. et al. (2022). Flora of Singapore: Checklist and bibliography. Gard. Bull. Singapore 74(Suppl. 1): 3–860.

The current flora checklist comprises 2,654 native taxa, 479 naturalised/casual taxa, and 101 cryptogenic taxa. Additionally, bryophytes (including mosses, liverworts, and hornworts), which were absent in the 2009 version, are now included. However, species that are cultivated only are excluded from this checklist.

Various classification systems for plants (taxonomic arrangement) are employed based on their appropriateness as assessed by the authors. For instance, the checklist utilizes a different classification system for fern families compared to that used by the Plants of the World Online (POWO) website, as briefly outlined in my note in September 2024. Another example pertains to some accepted botanical names of species in the Hedyotis-Oldenlandia complex found in Singapore, where I have consolidated the differences in a table in my note in January. Furthermore, the checklist has revived the family Taccaceae, although it is treated as a synonym of the family Dioscoreaceae by the POWO website. I am certain there are more differences between the checklist and the listing in the POWO website awaiting discovery. To simplify matters regarding the accepted botanical names to use, I adhere to those outlined on the POWO website.

The publication noted that a new edition (third edition) of the Singapore Red Data Book was scheduled for release in 2023, which has already occurred. It also highlighted the launch of the Flora of Singapore, with three volumes published in 2019. However, there appears to be minimal or no progress on the remaining volumes, as no further volumes have been released since 2019.