Studies in Ipomoea (Convolvulaceae) I. The Arborescens Group
نویسندگان
چکیده
منابع مشابه
Alkaloidal components in the poisonous plant, Ipomoea carnea (Convolvulaceae).
Natural intoxication of livestock by the ingestion of Ipomoea carnea (Convolvulaceae) sometimes occurs in tropical regions of the world. Polyhydroxylated alkaloids were isolated from the leaves, flowers, and seeds of the poisonous plant and characterized. Chromatographic separation of the leaf extract resulted in the isolation of swainsonine (1), 2-epi-lentiginosine (2), calystegines B(1) (3), ...
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The importance of discovering, describing and cataloguing poorly known species in herbarium collections is discussed. It is a spur to efforts at rediscovery and consequent conservation efforts. The problems faced in describing species from limited material are discussed and our methods and criteria in making a decision are described. Prospects for future novelties are briefly assessed. Fifteen ...
متن کاملThe Effects of Flower Color Transitions on Diversification Rates in Morning Glories (Ipomoea subg. Quamoclit, Convolvulaceae)
As in many clades of flowering plants, the Quamoclit clade of morning glories (Ipomoea subgenus Quamoclit) exhibits unequal proportions of different flower colors, with pigmented species outnumbering unpigmented species by nearly a factor of 7. We examined three possible macroevolutionary explanations for this pattern: (1) asymmetric transition rates between pigmented and unpigmented flowers; (...
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PREMISE OF THE STUDY Many reports have cited Baker's list of weediness traits, or those that exemplify the "ideal" weed, yet few have considered the evolutionary potential of such traits as a group. Thus, it is unknown whether constraints on the evolution of increased weediness, such as a lack of genetic variation or genetic correlations between the traits, are present. Ipomoea purpurea, the co...
متن کاملDevelopment of leaf shape and vein homologies in five species of the genus Ipomoea (Convolvulaceae)
Angiosperm leaves are extremely variable in form while predominantly maintaining the function of the primary photosynthetic organ of the plant. Changes in leaf form can result from myriad physiological processes which may be influenced by ecology, physical stimuli, phylogeny, or other factors. In studying the development of divergent leaf forms among closely related species, conserved morpholog...
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ژورنال
عنوان ژورنال: Annals of the Missouri Botanical Garden
سال: 1981
ISSN: 0026-6493
DOI: 10.2307/2398887