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Zur Evolution des Parasitismus bei den Scrophulariaceae und Orobanchaceae / Evolution of Parasitism in Scrophulariaceae and Orobanchaceae

Hans Christian Weber
Plant Systematics and Evolution
Vol. 136, No. 3/4 (1980), pp. 217-232
Published by: Springer
Stable URL: http://www.jstor.org/stable/23642582
Page Count: 16
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Zur Evolution des Parasitismus bei den Scrophulariaceae und Orobanchaceae / Evolution of Parasitism in Scrophulariaceae and Orobanchaceae
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Abstract

Different growth forms and life forms of parasitic plants in Scrophulariaceae and Orobanchaceae were studied from a comparative point of view. The most primitive form of parasitism is found in small, annual root parasites. Small wart-haustoria in the hypocotylar region of larger root parasites point towards a tendency of these plants to form hypocotylar tubercles as primary haustoria. Wart-haustoria also can develop on scale leaves, demonstrating an evolutionary trend towards the most advanced form of parasitism in these two families the formation of large leaf haustoria.

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