 |
| Drepananthus khaosoi Damth. & Chaowasku, in Damthongdee, Saengpho, Wiya, Baka, Chanthamrong, Ue-Aree et Chaowasku, 2024. ดอกข้าวซอย || DOI: 10.3989/ajbm.596 photo by A. Baka |
ABSTRACT
Drepananthus khaosoi sp. nov., a new species from southern Thailand is described and illustrated. It is morphologically most similar to D. ridleyi, especially in the very narrow and elongated petals, but differs in leaf blade size, leaf base, monocarp shape and appearance, monocarp width, length of monocarp stipe, pericarp thickness and seed arrangement. Molecular phylogenetic analyses using chloroplast DNA regions (matK and rbcL exons; trnL intron; atpB-rbcL, psbA-trnH and trnL-trnF intergenic spacers) and including 18 Drepananthus species confirm the monophyly of Drepananthus, but the relationships within the genus are largely unresolved, including a failure to elucidate a sister group of D. khaosoi. The conservation status of the new species is provisionally assessed as Critically Endangered.
Keywords: Canangeae; systematics; taxonomy; tree; tropical diversity.
 |
| Drepananthus khaosoi Damth. & Chaowasku, sp. nov.: a, inflorescences and flowers; b, flower with petal blades removed, bottom view, particularly showing abaxial side of sepals; c, outer petal claw (above): abaxial (left) and adaxial (right) sides; inner petal claw (below): abaxial (left) and adaxial (right) sides; d, flower with petals, one sepal and stamens removed, side view, particularly showing adaxial side of sepals and carpels on torus; e, stamen (middle: adaxial side; right: abaxial side) and carpel (left); f, fruit with monocarps [all, Chanthamrong & Baka 58 (CMUB)]; photos: A. Baka (a, f)]. |
Drepananthus khaosoi Damth. & Chaowasku, sp. nov.
Type: Thailand, Narathiwat Province, Sukhirin District, elevation c. 150 m, ...
(holotype: CMUB [CMUB003998901];
isotypes: BK, CMUB, QBG), fl. & fr.
Diagnosis.––The new species is morphologically most similar to D. ridleyi, but differs from it by having larger leaf blade, cordate to rounded-subcordate (vs. cuneate, occasionally ± obtuse) leaf base, subglobose to ellipsoid (vs. ellipsoid-cylindrical to cylindrical) monocarps which are not constricted between seeds (vs. somewhat constricted between seeds) when dry, wider monocarps, shorter monocarp stipe, thicker pericarp and different seed arrangement (interdigitated vs. uniseriate).
Etymology.—As a noun in apposition, the specific epithet is derived from Khao Soi, a traditional northern Thai noodle soup claimed to be one of the best soups in the world, in allusion to the similar appearance between petals of the new species (Fig. 2a) and Khao Soi noodles.
Anissara Damthongdee, Chanwut Saengpho, Chattida Wiya, Abdulromea Baka, Kithisak Chanthamrong, Phasit Ue-Aree, Tanawat Chaowasku. 2024. Drepananthus khaosoi sp. nov. (Annonaceae) from southern Thailand, with molecular phylogenetic reconstructions. Anales del Jardín Botánico de Madrid. 81(1); e144. DOI: doi.org/10.3989/ajbm.596
