Additions to the ‘Flora of Borneo: The vascular plant genera’ — I: Chewlunia (Rubiaceae) and Zygogynum (Winteraceae)

From Firenze University Press Journal: Journal of Plant Taxonomy and Geography (Webbia)

Sin Yeng Wong, Institute of Biodiversity and Environmental Con 94300 Kota Samarahan, Sarawak

The Flora of Borneo: The vascular plant genera (Wong 2023) presented for first time in more than a century an exhaustive checklist of all genera of ferns and fern allies, gymnosperms, and angiosperms found in Borneo: 271 families: 39 families (ferns and fern allies), 5 families (gymnosperms), and 227 families (angiosperms) of 1877 genera (1592 native genera, 192 intro-duced genera) and 12590 species. Inevitably with a project of such magnitude mistakes and omissions occurred, while with on-going research new records and new taxa are to be expected. Chewlunia Junhao Chen, P.K.Hoo & K.M.Wong The genus Chewlunia Junhao Chen, P.K.Hoo & K.M.Wong (Rubiaceae: Guettardeae) (Chen et al. 2023) was created to account for seven Philippines species previously assigned to Timonius DC., and one novel species from Sabah, Borneo — C. sabahenis P.K.Hoo & Junhau Chen, the type of the new genus.

“Chewlunia differs from other paleotropical Guet-tardeae genera by its free and valvate, large (‘foliaceous’) stipules that are f lat, tightly appressed together, and broadly ovateobovate with rounded apex. Particularly, it is distinguished from Timonius s.l. by its typically long, many-flowered monochasial branches of the inflores-cence (vs typically short, mostly few-flowered inflores-cence branches), pink (vs pale yellow to white) corolla with plane (vs with longitudinally ridged or thickened) corolla lobes.” (fide Chen et al. 2023).Chewlunia may be incorporated as follows into Wong (2023: 243).

DOI: https://doi.org/10.36253/jopt-15522

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