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Wednesday, July 3rd, 2024
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| 2:56a | [Botany • 2024] Saurauia decolorata (Actinidiaceae) • A New Species from Mindanao, the Philippines
Abstract Saurauia decolorata from the Mt. Pantaron Range, Bukidnon and Mt. Balatukan Natural Park, Misamis Oriental, Mindanao Island, the Philippines, is illustrated and described as a new species. It closely resembles S. avellana and S. elegans in having branchlets, petioles, and abaxial surfaces of the leaves covered with tomentum and scales, densely clustered flowers, longitudinal anther dehiscence, and 3–4 styles. However, S. decolorata is distinguished from these species by its prominent rusty-colored tomentum and scales on branchlets and abaxial leaf surfaces, cordate leaf bases, crenate margin, 16–21 pairs of lateral veins, fascicled-cymose inflorescences that are both axillary and ramiflorous, and sparsely scaly pinkish green outer sepals. This discovery further emphasizes the unique biodiversity of the forests of the Pantaron Range and Mt. Balatukan which urgently need legislative protection and enhanced protected area management plans, respectively. Actinidiaceae, Saurauia, Mindanao, biodiversity, Eudicots  Shiella Mae B. Olimpos, Darin S. Penneys, Daryl S. Salas, Fulgent P. Coritico, Victor B. Amoroso and Peter W. Fritsch. 2024. Saurauia decolorata (Actinidiaceae), A New Species from Mindanao, the Philippines. Phytotaxa. 658(1); 99-108. DOI: 10.11646/phytotaxa.658.1.4 | ||||||
| 1:04p | [Botany • 2024] Kaempferia calcicola • Cytotaxonomy of Kaempferia subgenus Protanthium (Zingiberaceae) supports A New limestone Species endemic to Thailand
Abstract Thailand is the biodiversity hotspot of genus Kaempferia (Zingiberaceae) and harbours 14 species belonging to K. subgenus Protanthium. To better understand the taxonomic circumscription and verify the taxonomic status, the present characterization of cytogenetic characters included all recognized and one undescribed species of K. subg. Protanthium from Thailand. Overall, 88 accessions of plant materials were analysed cytogenetically: 84 and 42 accessions were subjected to flow cytometry and karyology, respectively. Based on genome size and mitotic chromosome numbers, 74 accessions from all species investigated were putative diploid, whereas the others were putative polyploid: triploid (three accessions) and tetraploid (11 accessions). The cytogenetic evidence indicates that 2n = 2x = 22 is the diploid number and x = 11 is the base chromosome number for K. subg. Protanthium. The genome sizes among the diploid accessions ranged from 3.687 to 6.412 pg while high intraspecific variation in genome size was observed with up to 19.4%. Two species included accessions with different ploidy levels: K. rotunda L. (diploid, triploid and tetraploid) and K. takensis Boonma & Seansouk (diploid and tetraploid). The increase in genome size of tetraploid K. rotunda is nearly in correlation to the increase in ploidy level, whereas the triploid plants represent genome expansion with an approximately 11% larger than expected genome. Interestingly, tetraploid K. takensis displays genome downsizing of 15.3% compared to their diploids. The cytogenetic characteristics, together with morphology, unequivocally clarify the taxonomic status of a new species, named Kaempferia calcicola Noppornch. A revised identification key to species of K. subg. Protanthium is provided. KEYWORDS: chromosome number, cytogenetics, Cytotaxonomy, genome size, Kaempferia, Kaempferia subg. Protanthium, Khon Kaen province, new species, polyploidy, species circumscription, taxonomy, Thailand, Zingiberaceae
  Kaempferia calcicola Noppornch., sp. nov. Diagnosis — Kaempferia calcicola Noppornch. is similar to K. takensis Boonma & Seansouk in overall habit, inflorescence and floral plane, but differs by anther crest obreniform, broadly ovate, obovate to obdeltoid (vs anther crest oblong to ovate in K. takensis) with irregular undulate to crenate apex (vs bilobed to irregularly tridentate apex, usually with 2–3 small teeth between lobes in K. takensis) and labellum with an incision c. 3/5 of its length (vs labellum with an incision more than 2/3 of its length in K. takensis). It is also similar to K. lopburiensis Picheans. in inflorescence, floral plane and flower colour, but differs by prominent pseudostem upright above ground (vs pseudostem short and completely embedded in soil in K. lopburiensis), leaf blades elliptic, elliptic-oblong to lanceolate-oblong and longer petiole 3–18(–30) cm long (vs leaf blades suborbicular to ovate, adpressed on ground and subsessile petiole in K. lopburiensis).
 Nattapon Nopporncharoenkul, Wiphada Sukseansri, Possathorn Nopun, Jiraporn Meewasana, Thaya Jenjittikul, Ngarmnij Chuenboonngarm, Unchera Viboonjun and Puangpaka Umpunjun. 2024. Cytotaxonomy of Kaempferia subg. Protanthium (Zingiberaceae) supports A New limestone Species endemic to Thailand. Willdenowia. 54(2); 149-121. DOI: 10.3372/wi.54.54201 |
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