Numerical taxonomic analysis in leaf architectural traits of some <i>Hoya</i> R. Br. species (Apocynaceae) from Philippines

Abstract

The present study examines the leaf variations in leaf traits of four Hoya R. Br. species from Philippines namely: (1) H. buotii Kloppenburg, (2) H. halconensis Kloppenburg, (3) H. mindorensis Schlechter red bearing flowers; and (4) H. mindorensis Schlechter yellow bearing flowers. Leaf samples (n= 30 leaves) were collected from each plant group and measured with nine architectural traits. The results showed variability in the leaves using univariate and multivariate analysis. Data ordination depicted variations in leaf morphology. The two plant groups H. mindorensis red bearing flowers and H. mindorensis yellow bearing flowers were consistently variable as supported by principal coordinate analysis, cluster analysis and two way Anova (P&lt;0.001). The variability of the two plant groups could be due to developmental instability, plasticity or taxonomic identity, one being the subspecies of the other. Hence, a closer study to investigate the significant variability of the two plant groups was recommended. Distinct separation of H. buotii and H. halconensis was detected being regularly mistaken as one species. The study demonstrated the applicability of multivariate analysis as effective tool in numerical taxonomy. Multivariate analysis can be employed to demonstrate likelihood of relationship among various Hoya species.Bangladesh J. Plant Taxon. 23(2): 199-207, 2016 (December)

Morphology of Hoya megalaster Warb. Ex K. Schumann & Lauterb and Hoya pachyphylla Warb. Ex K. Schumann & Lauterb (Apocynaceae) from New Guinea, Indonesia

“…One of the key reproductive characters to evaluate when describing Hoyas is the presence of five staminal coronal lobes attached to the staminal column [12]. In the absence of reproductive organs, the use of leaf characters can be used to described Hoyas, such as the study conducted by Jumawan & Buot [13] on the Hoya diversity in the Philippines.…”

Applications of leaf architecture characters in delineating selected species and infraspecific taxa of Genus Cucumis L. (Cucurbitaceae)

“…ex L. (Antonio and Buot 2021), and Hoya R. Br. (Salvaña and Buot 2014;Villareal and Buot 2015;Jumawan and Buot 2016;Torrefiel and Buot, 2017;Tan and Buot 2018;Baltazar and Buot, 2019;Paguntalan and Buot 2019). These researches revealed that leaf architecture has enormous potential as a tool for solving taxonomic problems.…”

Leaf architectural analysis of taxonomically ambiguous Hoya lacunosa Blume and Hoya krohniana Kloppenb. & Siar

“…No genus revision has been published as of this writing; the need for this revision persists amid the recent increase in the popularity of urban gardening, which gives even more public significance to identifying plants properly. In the interim, several studies have utilized leaf architecture analysis to offer supplemental information on the delineation of some controversial Hoya species, such as H. incrassata vs. H. crassicaulis (Villareal and Buot 2015), H. buotii vs. H. halconensis (Jumawan and Buot 2016), among H. carandangiana, H. bicolensis, and H. camphorifolia (Torrefiel and Buot 2017), H. merrillii vs. H. quinquenervia (Paguntalan and Buot 2019), to name a few.…”