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The Development of Vessels in Angiosperms and its Significance in Morphological Research

I. W. Bailey
American Journal of Botany
Vol. 31, No. 7 (Jul., 1944), pp. 421-428
Stable URL: http://www.jstor.org/stable/2437302
Page Count: 8
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The Development of Vessels in Angiosperms and its Significance in Morphological Research
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Abstract

Vessels have originated independently in five distinct categories of the Tracheophyta, viz. Selaginellales, Filicales, Gnetales, monocotyledons and dicotyledons. The origins and salient trends of specialization of vessels in the primary bodies of monocotyledons and in both the primary and secondary bodies of dicotyledons are clearly definable upon the basis of available evidence preserved in extant representatives of the angiosperms. The irreversible phylogenetic trends in the origins and specializations of vessels are so comprehensive and reliable that they deserve serious consideration in various lines of botanical research. Their significance in the fields of comparative and developmental morphology are discussed in this paper, leaving their significance in the discussion of physiological problems for future consideration.

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