Chromosome numbers and rust susceptibility as taxonomic criteria inRosaceae |
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Authors: | Adel El-Gazzar |
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Institution: | (1) Institut für Systematische Botanik der Universität, Menzinger Straße 67, D-8000 München 19, Federal Republic of Germany;(2) The Herbarium, Faculty of Science, Cairo University, Giza, Egypt |
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Abstract: | BothNeuradoideae andChrysobalanoideae seem rust-free. TheSpiraeoideae andPomoideae are heavily susceptible toGymnosporangium rusts. While thePrunoideae resemble theRosoideae in being vulnerable to attacks ofPuccinia species, they are additionally susceptible toTranzschelia andThekopsora, whereas theRosoideae are characteristically afflicted byPhragmidium.—It is suggested (a) to treat theChrysobalanoideae as a separate family (Chrysobalanaceae), (b) to transferDryas from theRosoideae-Potentilleae-Dryadinae to theRosoideae-Cercocarpeae, and (c) to divide theRosoideae into two main groups of tribes: (i) the rust-freeKerrieae andCercocarpeae with x = 9, and (ii) the rust-susceptiblePotentilleae, Ulmarieae, Roseae andSanguisorbeae with x = 7. |
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Keywords: | Angiosperms Rosaceae Uredinales Chromosome numbers rust susceptibility tribal classification |
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