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In parasites (Lathraea, Orobanche) and in plants growing on decaying vegetable matter (saprophytes), in which no chlorophyll is formed, these scales are the only leaves produced.
A gamopetalous corolla falls off in one piece; but sometimes the base of the corolla remains persistent, as in Rhinanthus and Orobanche.
My research focuses on how host specificity can drive speciation in Orobanche species native to the UK.
The plants during growth are liable to injury by severe frost, excessive rain, insects, fungi and the growth of a root-parasite (Orobanche indica).