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| Pseuduvaria sirindhorniana Yoosukkee, Damth. & Chaowasku, in Yoosukkee, Damthongdee, Aongyong, Baka, Sama-ae et Chaowasku, 2026. |
Abstract
Based on the molecular phylogenetic analyses of six plastid DNA regions (matK and rbcL exons; trnL intron; atpB-rbcL, psbA-trnH and trnL-trnF intergenic spacers) and including 57 samples of Pseuduvaria, as well as thorough morphological studies, Pseuduvaria sirindhorniana (Annonaceae, Miliuseae) is described and illustrated here as a new species from Narathiwat, southern Thailand. The new species belongs to a major clade that also includes P. fragrans, P. gardneri, P. glossopetala, P. kwangtungensis, P. multiovulata and P. phuyensis. Pseuduvaria sirindhorniana is morphologically most similar to P. glossopetala, but differs by having basally connate (vs. free) sepals, larger petals, elliptic-ovate (vs. obovate) outer petals, inner petals that are only connivent at the apex (vs. connivent from the base to ± the midpoint and at the apex), with openings formed from the base (vs. openings formed from ± the midpoint). Pseuduvaria kwangtungensis turns out to be a putative sister of the new species, but the two are morphologically dissimilar in several traits, such as leaf base, inner petal appearance and glands on the inner side of the inner petals.
Keywords: Magnoliids; Malmeoideae; Miliuseae; Pseuduvaria; Systematics; Taxonomy; Thailand
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| Pseuduvaria sirindhorniana Yoosukkee, Damth. & Chaowasku. a. Inflorescences with flowers, from living material of Aongyong & Baka 55. b. Infructescence with monocarps, from living material of Aongyong & Baka 56. — Photographs by A. Baka. |
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| Holotype of Pseuduvaria sirindhorniana Yoosukkee, Damth. & Chaowasku (Aongyong & Baka 55, CMUB). |
Pseuduvaria sirindhorniana Yoosukkee, Damth. & Chaowasku sp. nov.
Pseuduvaria sirindhorniana differs from the morphologically most similar species, P. glossopetala, by having basally connate (vs. free) sepals, larger petals, elliptic-ovate (vs. obovate) outer petals, inner petals that are only connivent at the apex (vs. connivent at the apex and from the base to ± the midpoint), with openings formed from the base (vs. openings formed from ± the midpoint).
Etymology — The specific epithet honours H.R.H. Princess Maha Chakri Sirindhorn of Thailand, who has continuously supported the study of plant taxonomy in Thailand and worldwide, on the auspicious occasion of her 72nd (6th cycle) birthday anniversary (2 April 2027). She has also been instrumental in establishing the Plant Genetic Conservation Project under the Royal Initiative (RSPG), which aims to train personnel and develop plant genetic resources for the conservation of plant diversity, with benefits extending to farmers and related sectors of the country.
Vernacular name — Ruchi Sirin (รุจิสิริน).
C. Yoosukkee, Anissara Damthongdee, Kithisak Aongyong Chanthamrong, Abdulromea Baka, I. Sama-ae and Tanawat Chaowasku. 2026. Molecular Phylogenetic and Morphological Evidence supports the Recognition of Pseuduvaria sirindhorniana (Annonaceae), A New Species from southern Thailand. Blumea - Biodiversity, Evolution and Biogeography of Plants. DOI: doi.org/10.3767/blumea.2026.70.03.02 [May 26, 2026]
