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In the intermediate zone of the inflorescence of genera of Aroideae one can find flowers with male and female characteristics. Until now, two types of developmental sequences of atypical bisexual flowers (ABFs) have been recognized: the Philodendron type and the Cercestis type. In the Philodendron t...
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A comparative developmental study of the inflorescence of Philodendron solimoesense was conducted using scanning electron microscopy. The spadix of P. solimoesense is characterized by unisexual flowers. Staminate flowers are initiated on the upper portion of the spadix while pistillate flowers devel...
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The establishment of basic leaf shape in three representative members of the genus Vitis (Vitis riparia Michx., cultivars Vivant and Concord) was studied using scanning electron microscopy. At maturity, the leaves of the above taxa have specific and recognizable features which makes it possible to d...
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The spadix of Arum italicum Miller consists of two main parts: a clavate sterile portion (appendix) and a cylindroid fertile portion. In the fertile portion with both male and female zones, there are two zones of sterile flowers (bristles). The basal portion of bristles is surrounded by a verrucose ...
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This study deals specifically with floral organogenesis and the development of the inflorescence of Philodendron squamiferum and P. pedatum. Pistillate flowers are initiated on the lower portion of the inflorescence and staminate flowers are initiated on the distal portion. An intermediate zone cons...
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A modified mathematical model based on the concept of generative centres is proposed to describe organogenesis in young leaf primordia of Murraya paniculata. Measurements of specific parameters on leaf primordia at different stages of development support the basic assumptions of the model. These ass...
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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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The early stages of development of the inflorescence of Philodendron insigne 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 three to five sta...
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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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The floral morphology of Ambrosina and Arisarum is analysed from a developmental and phylogenetic point of view. In Arisarum, there are atypical organs displaying male and female characteristics. This developmental study shows that the male flowers of Ambrosina are di- or tri-androus. A close phylog...
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The early stages of inflorescence development in Philodendron fragrantissimum (Hook.) G. Don are 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.
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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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Leaf characters, such as angles between major veins, ratios of the length of leaf lobes, of leaf lobes and sinuses, and of petioles and leaf lobes, were measured on leaves of different sizes and compared against leaf blade length (an indirect measure of developmental time) to see if there were diffe...
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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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Explores aspects of floral development in Philodendron grandifolium and Philodendron megalophyllum. Initiation of pistillate and staminate flowers; Morphology of the mature flowers; Function of the presence of calcium oxalate crystals; Observations of the homeotic shift between carpels and staminode...