Ovules and seeds ofDirachma socotrana (Dirachmaceae)

Boesewinkel, F. D.; Bouman, F.

doi:10.1007/bf01464405

Cited by 10 publications

(3 citation statements)

References 10 publications

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“…A complex of Rhamnaceae, Elaeagnaceae, the monotypic Barbeyaceae (Arabia and northeastern Africa; see Bouman and Boesewinkel, 1997;Thulin et al, 1998), and the enigmatic, monotypic Dirachma (Socotra, south of Yemen; previously placed in Geraniaceae but more recently in its own family; see Boesewinkel and Bouman, 1997) comprises, at least in part, the sister group to the urticalean clade. The placement of Barbeya outside urticalean rosids and in a complex of taxa including Dirachma, Elaeagnaceae, and Rhamnaceae is consistent with recent molecular analyses (Thulin et al, 1998;Richardson et al, 2000;Savolainen et al, 2000a, b;Soltis et al, 2000) and with the suggestion of Tobe and Takahashi (1990), based on trichome and pollen morphology, that Barbeyaceae are sufficiently different to be removed from the urticalean clade.…”

Section: Discussionmentioning

confidence: 99%

Urticalean rosids: circumscription, rosid ancestry, and phylogenetics based on rbcL, trnL‐F, and ndhF sequences

Sytsma

Morawetz

Pires

et al. 2002

American J of Botany

191

130

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To address the composition of the urticalean rosids, the relationships of the component families (maximally Cannabaceae, Cecropiaceae, Celtidaceae, Moraceae, Ulmaceae, and Urticaceae) and analyze evolution of morphological characters, we analyzed sequence variation for a large sampling of these families and various rosid outgroups using rbcL, trnL-F, and ndhF plastid regions. Urticalean rosids are derived out of a lineage including Barbeyaceae, Dirachmaceae, Elaeagnaceae, and Rhamnaceae, with Rosaceae less closely related; thus, they are imbedded within Rosales. Ulmaceae are the sister to all remaining families. Cannabaceae are derived out of a subclade of Celtidaceae; this expanded family should be called Cannabaceae. Cecropiaceae are derived within Urticaceae and are polyphyletic with Poikilospermum derived elsewhere within Urticaceae; this expanded family should be called Urticaceae. Monophyletic Moraceae are sister to this expanded Urticaceae. Support for these relationships comes from a number of morphological characters (floral sexuality, presence or absence of hypanthium, stamen type and dehiscence, pollen pore number, ovule position, and embryo alignment) and chromosome numbers. Most fruit types, in terms of ecological dispersal, are derived independently multiple times and are strongly correlated with habitat.

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Section: Discussionmentioning

confidence: 99%

Urticalean rosids: circumscription, rosid ancestry, and phylogenetics based on rbcL, trnL‐F, and ndhF sequences

Sytsma

Morawetz

Pires

et al. 2002

American J of Botany

191

130

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“…Recent rbcL studies (Thulin et al in press) have questioned the close relationship between Barbeya oleoides (Barbeyaceae) and Urticales and indicate Rhamnaceae and Dirachmaceae as the closest relatives of Barbeyaceae. In a study on ovule and seed structure, Boesewinkel & Bouman (1997) provided additional arguments which sustain the relation between Dirachmaceae and Rhamnaceae. Dirachmaceae and Rhamnaceae are both characterized by laterally flattened seeds, with one median tegumentary bundle and an exotestal palisade.…”

Section: Discussionmentioning

confidence: 99%

Ovules and seeds of Barbeya with additional arguments for an urticalean affinity of the Barbeyaceae

Bouman

Boesewinkel

1997

Acta Botanica Neerlandica

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SUMMARY Barbeya oleoides has a bitegmic, crassinucellate and anatropous ovule. The inner and outer integuments are about five layers thick and not vascularized. The endosperm is initially nuclear, to become cellular later. The mature seed coat is unspecialized, remains parenchymatic and is locally compressed, except for the exotesta and the tanniniferous endotegmen. The exotesta is perforated by distinct crateriform holes. The embryological and anatomical seed coat characters support an urticalean affinity of the Barbeyaceae.

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“…In a comprehensive review, Endress et al (2000), discuss the multivariate nature of systematic work and the place of molecular studies alongside anatomical and morphological studies, not in lieu of them. Anatomical characters have on several occasions contributed to increased resolution when based on solid phylogenetic foundations (Boesewinkel and Bouman 1997, Boesewinkel 1999, Endress et al 2000). Among woody genera, foliar anatomical studies are relatively less common in the literature compared to wood anatomical studies, which are plentiful (Baas et al 1982, Baas et al 1988).…”

Section: Introductionmentioning

confidence: 99%

Foliar anatomy of some Prunus L. subgen. Cerasus Mill. (Rosaceae) taxa

Ordu

Çiftçi

Mollman

et al. 2021

Nordic Journal of Botany

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Prunus L. subgen. Cerasus Mill. (Rosaceae) contains numerous economically important species, including fruit trees and ornamental plants. This study compares the leaf anatomy and calcium oxalate crystal types of 98 individuals of 14 Prunus subgen. Cerasus taxa from Turkey. We stained leaf sections with Safranin‐Alcian Blue double stain and mapped calcium oxalate crystals under light microscope with polarized light. We used one‐way ANOVA to determine the statistical significance of quantitative data. Significant quantitative and qualitative data were analyzed using PCoA to establish relationships among taxa. We observed three different crystal distribution patterns and three crystal types, finding druses present in all taxa, while some taxa also have sand or prismatic forms. Most characters showed high variation. Our analysis shows that vascular bundle, midrib, upper epidermis and lower epidermis width/length ratios; midrib epidermis, upper epidermis and phloem cell lengths; upper epidermis and lower epidermis cell widths and lower cuticle thickness are not taxonomically useful, while features of the bundle sheath, epidermis cell surface, phloem fibers, mesophyll layers and angle of blade between the midrib can be used in conjunction with other characters to distinguish certain taxa. Overall, PCoA delineated two rough groups, separating P. avium, P. cerasus and P. mahaleb from the rest of the studied taxa. In investigating the anatomical variation between different individuals of these taxa, we found that some features previously used in infraspecific taxa, such as trichomes, varied sometimes even within an individual, casting doubt on the wisdom of using these for systematic work in subgenus Cerasus.

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Ovules and seeds ofDirachma socotrana (Dirachmaceae)

Cited by 10 publications

References 10 publications

Urticalean rosids: circumscription, rosid ancestry, and phylogenetics based on rbcL, trnL‐F, and ndhF sequences

Urticalean rosids: circumscription, rosid ancestry, and phylogenetics based on rbcL, trnL‐F, and ndhF sequences

Ovules and seeds of Barbeya with additional arguments for an urticalean affinity of the Barbeyaceae

Foliar anatomy of some Prunus L. subgen. Cerasus Mill. (Rosaceae) taxa

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