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This study presents a survey of the species of the Araceae where extracellular production of calcium oxalate crystals has been observed and discusses the patterns of production of the crystals in different genera. For all Araceae studied using SEM, the oxalate crystals exuding on the epidermal surfa...
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The Gulf of St. Lawrence aster, Symphyotrichum laurentianum (Fernald) G.L. Nesom (Asteraceae), a small annual halophyte endemic to disturbed and highly transient habitats in the Gulf of St. Lawrence, is classified as "threatened" by the Committee on the Status of Endangered Wildlife in Canada. Lepid...
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A comparative developmental study of the compound leaves Ailanthus altissima, Lupinus polyphyllus, Fraxinus americana, Rhus typhina and the highly dissected leaves of Achillea millefolium, was initiated to document the changes in form that lateral elements (leaflets/lobes) undergo at later stages in...
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Background and Aims: By using the technique of replicas of a developing apex it is possible to obtain a direct measure of phyllotactic parameters (plastochrone and platochronic ratio) involved in the initiation of two successive primordia at the level of the SAM. The goal of this study is to compare...
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Previous studies on palm phyllotaxis deal mainly with the mature trunk. The goals of this study are (i) to determine the relationship between the number of parastichies, the divergence angle, and the plastochrone ratio at the level of the shoot apical meristem; (ii) to examine whether there are fluc...
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Instead of alternating as is typical for the majority of flowering plants, the five stamens of Basella rubra are superposed to the five tepals. The first two tepals toward the abaxial side are initiated first, followed by the two tepals toward the adaxial side and the abaxial tepal that may be laggi...
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In Angiosperms placentae or ovules are fomed on carpels or the floral apex. Hence, in a developmental sense, there are carpellate and acarpellate gynoecia. The latter occur in about 11% of all Angiosperm families. Basella rubra is an example of the noncarpellate condition. Its single basal ovule is ...
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S. laurentianum, the Gulf of St. Lawrence Aster, is an endemic aster of Prince Edward Island, New Brunswick, and the Magdalene Islands. It is considered by the Committee on the Status of Endangered Wildlife in Canada to be of special concern in Canada and to be critically imperiled in Prince Edward ...
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Background and Aims The mature morphology of most plants can usually be said to consist of three mutually exclusive organs: leaves, stems, and roots. The vast majority of mature morphologies may be easily grouped into one of these mutually exclusive categories. However, during very early stages of d...
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In addition to two opposite cotyledons, germinating seedlings of V. riparia and Vitis cv. Vivant display two other phyllotactic patterns: (1) immediately following the emergence of the cotyledons, leaves are initiated individually in a spiral pattern, usually 2/5; (2) upon the initiation of the firs...
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Myriophyllum aquaticum (Vell.) Verdc. produces two morphologically different forms of leaves based on whether they are aerial or aquatic. The objective of this study was to determine whether there are any similarities or differences between these two growth forms during their early stages of develop...
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The floral development of Syngonium angustatum is analysed in the context of a recently published molecular phylogeny of the Araceae. The initiation of discoid floral primordia occurs acropetally on the surface of the inflorescence. Female flowers, atypical bisexual flowers, sterile male flowers and...
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Background The floral development of Dieffenbachia seguine (N. J. Jacquin) Schott is analysed in relation to the molecular phylogeny of the Spathicarpae by Cusimano et al. (Am J Bot 98:654–668, 2011). Results The initiation of discoid floral primordia occurs acropetally on the surface of the sp...
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The development of stipules, especially their spatial and temporal pattern of initiation in relation to the leaf, was investigated in Vitis riparia cv. Concord, Parthenocissus tricuspidata, Cissus oblonga, C. hypoglauca and C. rhombifolia. Early initiation is characterized by the occurrence of a sin...
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