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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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Homeosis is defined as the complete or partial replacement of one part of an organism with another part. Double-flowered cultivars of H. rosa-sinensis display a divergent floral morphology that appears to fit the criteria for homeosis. The corolla of single flowered cultivars is pentamerous. Mature ...
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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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The larval stages of the cynipid wasp Diplolepis rosaefolii induce the formation of single-chambered, lenticular galls on the leaves of the wild shrub rose, Rosa virginiana. The development of galls induced by D. rosaefolii was studied using light and scanning electron microscopy. The gall consists ...
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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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The upland hardwood component of Prince Edward Island's Acadian forest is among the best remaining examples of the precolonial landscape, but it has been severely fragmented during the past 300 years of human use and settlement. Despite the ecological importance of this remnant habitat and its level...
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In Philodendron, pistillate flowers are initiated on the proximal portion of the inflorescence and staminate flowers are initiated on the distal portion. Between the staminate and pistillate flowers, there is a transition zone consisting of sterile male flowers adjacent to the male zone and a row of...
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In the spadix of Caladium, there is a clearly recognizable intermediate zone consisting of sterile male flowers. The transition between the female zone and the male sterile zone is more or less abrupt. During the early stages of development of the inflorescence, a few atypical bisexual flowers betwe...
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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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The leaves initiated at successive nodes in the heteroblastic series in Leea guineensis seedlings become progressively more complex in construction. Leaves at the first four nodes are simple and are followed by transitional forms between nodes 5 and 7. These transitional leaf forms are compound in n...
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The Gulf of St. Lawrence Aster, Symphyotrichum laurentianum, is a member of the family Asteraceae and is listed as "threatened" by COSEWIC (Committee on the Status of Endangered Wildlife in Canada). This rare and vulnerable halophyte grows in only a few locations in New Brunswick, Prince E...
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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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The spadix of M. arborescens has a cylindrical or ellipsoid form at maturity and contains unisexual flowers without a perianth. The pistillate and staminate flowers are located in the basal and apical portions, respectively, of the inflorescence. In the upper portion of the female zone, there is a r...
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The early stages of development of the inflorescence of Philodendron melinonii were examined using scanning electron microscopy. Pistillate flowers are initiated on the lower portion of the inflorescence and staminate flowers are initiated on the distal portion. The male flowers have four to five st...
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Scirpus acutus Muhl. is a hardstem bulrush found throughout North American wetlands. The seeds of most species of Scirpus have a relatively low germination potential. Seed viability and the developmental morphology of the embryo upon germination were studied using standard tetrazolium (TZ) testing, ...