Abstract
The morphology, anatomy and affinities of the Pentoxyleae - an incompletely known group of Gymnosperms combining the character of Pteridosperms, Cycadales, Bennettitales and Coniferales are briefly reviewed from certain aspects. The lacunae in our present knowledge of the three petrified plant organ genera which constitute this group are pointed out and discussed. Various suggestions to clear up these lacunae are made for the benefit of the future workers. It is also suggested that a more systematic, well-designed and extensive collection of silicified material from Nipania and subsequent objective and purposeful investigations on them would reveal important morphological and anatomical features which would more accurately define the affinities and systematic position of this group of fossil plants.
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