Pollen morphology and its systematic implications for the generaKeiskea miq. andCollinsonia L. (Elsholtzieae-Lamiaceae)

Hong, Suk Pyo

doi:10.1007/bf03030706

Cited by 7 publications

(9 citation statements)

References 13 publications

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“…2a–b; cf. Pozhidaev 1989, Trudel and Morton 1992, Wagstaff 1992, Zhou et al 1997, Hong 2007). The sexine ornamentation of Collinsonia pollen is primarily perforate, without secondary reticulum, or has a very weak bireticulate appearance (Hong 2007).…”

Section: Discussionsupporting

confidence: 55%

“…Such pollen grains have been considered unique to Collinsonia , and have been recognised by Wagstaff (1992) as an autoapomorphic character in the tribe Mentheae sensu Bentham. However, based on the results of the current study, as well as recent palynological studies, the perforate sexine ornamentation has evolved independently several times throughout the tribe Elsholtzieae (Zhou et al 1997, Hong 2007).…”

Section: Discussionmentioning

confidence: 91%

“…Investigations of pollen morphology has been essential for elaboration of the taxonomy of Lamiaceae (Erdtman 1945, Pozhidaev 1989, Abu-Asab and Cantino 1992, Moon and Hong 2003, Hong 2007, Celenk et al 2008, Moon et al 2008a, 2008b, 2008c. However, the pollen morphology of the genus Elsholtzia is not well known, and few studies have been conducted to evaluate the morphology.…”

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confidence: 99%

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Systematic implications of pollen morphology in Elsholtzia (Elsholtzieae–Lamiaceae)

Jang¹,

Jeon²,

Hong³

2010

Nordic Journal of Botany

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Pollen morphology of 18 species (32 specimens) representing all three currently recognized sections of the genus Elsholtzia (Elsholtzieae–Lamiaceae) was investigated in detail using light, scanning electron and transmission electron microscopy. Elsholtzia pollen grains are small to medium in size (P=20–50 μm, E=16–45 μm), mostly prolate‐spheroidal to prolate, and rarely oblate‐spheroidal to subprolate in shape (P/E=0.95–1.46), hexacolpate (the amb more or less circular or ellipsoid) with granular aperture membranes. Three distinct types of sexine ornamentation are observed in Elsholtzia: perforate, rugulose‐bireticulate, and bireticulate. The bireticulate pattern is the most common, showing a wide range of morphological variation among species. The exine thickness varies from 1.2 to 2.5 μm. Among the present palynological data, the variability observed in sexine ornamentation of Elsholtzia could be of systematic significance. Current infrageneric classification of the genus Elsholtzia is partially congruent with pollen morphological data.

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Section: Discussionsupporting

confidence: 55%

Section: Discussionmentioning

confidence: 91%

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confidence: 99%

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Systematic implications of pollen morphology in Elsholtzia (Elsholtzieae–Lamiaceae)

Jang¹,

Jeon²,

Hong³

2010

Nordic Journal of Botany

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“…(2003 noted that Collinsonia and Keiskea had many characters in common (e.g., the structure of the inflorescence and morphology of calyx, corolla, mericarp, and disc), with the major difference being the median lobe of the anterior corolla lip (entire in Keiskea vs. more or less fimbriate in Collinsonia), which they consider insufficient for generic separation. However, Hong (2007) compared the micromorphology of pollen grains of Keiskea and Collinsonia and found that these genera could be easily distinguished by exine sculpture (well-developed bi-reticulate vs. perforate or faint/very weakly bi-reticulate without supratectal ridges), columellae (unbranched vs. branched), and intine thickness (one-third to one-half of the total exine thickness vs. two-thirds of the total exine thickness).…”

Section: Discussionmentioning

confidence: 99%

Resolving the phylogenetic position of Ombrocharis (Lamiaceae), with reference to the molecular phylogeny of tribe Elsholtzieae

Chen

Drew

et al. 2016

TAXON

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Ombrocharis is the only incertae sedis genus within Lamiaceae that has not been included in a published molecular phylogenetic study. Here, we adopt a two‐step approach to resolve the phylogenetic placement of the genus. Initially, the subfamilial affiliation of Ombrocharis was determined based on a combined ndhF and rbcL dataset covering all seven subfamilies of Lamiaceae. Results show that Ombrocharis is a member of Nepetoideae, a placement that is also supported by its hexacolpate pollen grains. In the second set of analyses, two nrDNA (ITS, ETS) and four cpDNA (ycf1, rps15‐ycf1, trnL‐F, rpl32‐trnL) markers were used to explore the position of Ombrocharis within Nepetoideae. Our results demonstrate that Ombrocharis and another monotypic genus, Perillula, form a clade that is sister to the remaining genera of tribe Elsholtzieae. Ombrocharis and other taxa within Elsholtzieae share divergent stamens, a weakly 2‐lipped corolla, and an asymmetric disc with an elongate anterior lobe, but it is unclear whether these features are apomorphic. This study represents both the most comprehensive phylogenetic analysis of Elsholtzieae to date and the only study to include all genera of Elsholtzieae. The monophyly of Elsholtzieae (including Ombrocharis) is well supported, and there is weak support for Elsholtzieae as sister to the rest of Nepetoideae. Additionally, our results do not support the merging of Keiskea with Collinsonia, and Elsholtzia may be polyphyletic.

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“…Investigations of pollen morphology in Lamiaceae have been essential in the classification within this family (Celenk et al, 2008a). The pollen of Lamiaceae has been studied since Erdtman (1945) suggested a division of the family into two subfamilies based on the number of nuclei and aperture number in pollen grains, including the genera Stachys L., Keiskea Miq., and Nepeta L. in the same subfamily (Abu‐Asab & Cantino, 1994; Hong, 2007; Celenk et al, 2008a; Dinc & Ozturk, 2008), and Thymus sect. Serpyllum , the genera Mentha L., and Lycopus L. in the same tribe with the genus Perilla (Martonfi, 1997; Moon & Hong, 2003; Celenk et al, 2008b).…”

Section: Differences In Classification Of Perilla In Japan and China*mentioning

confidence: 99%

Primary identifications and palynological observations ofPerillain China

Huang

Sun

Neo

et al. 2010

Journal of Systematics and Evolution

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Unresolved controversies concerning the classification of the monotypic genus Perilla L. have hindered the complete understanding and subsequent sustainable use of these vital food, oil, and medicinal plants to their full potential. In the present study, we used scanning electron microscopy to obtain palynological evidence from 21 samples of Perilla plants from seven provinces in China as a potential further attribute for classification. The findings showed that pollen grains from plants of 11 samples were oblate, whereas those of the other 10 were suboblate; there were no prolate pollen grains observed. Pollen grains from all samples had diverse exine ornamentations. Based on whether they had continuous tecta on the ornamentations, the pollen grains from the 21 samples were classified into two categories: (i) 14 with irregular reticulates; and (ii) seven with continuous tecta with no perforations. None of the samples was bireticulate. The ornamentation pattern and size of pollen grains jointly provided evidence that it is appropriate for use in classifying the genus Perilla into five varieties of one species. Furthermore, by comparison, it is concluded that the shapes and exine ornamentations of Perilla are unique among those of the seven genera already investigated in the subfamily Lamioideae. Using these pollen features, Perilla can be easily distinguished from the two other subtribes (Menthinae Briq. and Thyminae Briq.) in the same tribe, supporting the view that Perilla and the other four related genera can be classified into one subtribe (Perillinae).

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Pollen morphology and its systematic implications for the generaKeiskea miq. andCollinsonia L. (Elsholtzieae-Lamiaceae)

Cited by 7 publications

References 13 publications

Systematic implications of pollen morphology in Elsholtzia (Elsholtzieae–Lamiaceae)

Systematic implications of pollen morphology in Elsholtzia (Elsholtzieae–Lamiaceae)

Resolving the phylogenetic position of Ombrocharis (Lamiaceae), with reference to the molecular phylogeny of tribe Elsholtzieae

Primary identifications and palynological observations ofPerillain China

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