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SHOOT ORGANIZATION IN DICOTYLEDON AND MONO-COTYLEDON

Nature volume 150, pages 9596 (18 July 1942) | Download Citation

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Abstract

A PAPER by C. P. Majumdar (Ann. Bot., 6, No. 21, January, 1942) on the organization of the shoot of Heracleum Sphondylium leads to an interesting comparison of the mode of growth of the dicotyledon and the monocotyledon. One distinction frequently made between the two is that the leafhas a comparatively narrow insertion in the dicotyledon, and as a result room is found for two cotyledons around the embryonic apex ; in the monocotyledon the leaf insertion is wide, often completely encircling the axis, and there is only one cotyledon. Two families of Dicotyledons, the Ranunculaceæ and Umbelliferæ, are characterized by unusually wide leaf insertions, and it is suggestive that all the best authenticated cases of monocotylous dicotyledons have been reported from these families.

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https://doi.org/10.1038/150095b0

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