Centripetal xylem in the pedicel of a monocotyledon

Joshi, A. C. (1939) Centripetal xylem in the pedicel of a monocotyledon Nature, 143 (3629). p. 859. ISSN 0028-0836

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Official URL: http://www.nature.com/nature/journal/v143/n3629/ab...

Related URL: http://dx.doi.org/10.1038/143859a0


The centripetal xylem in the stem among the vascular plants is confined to the Pteridophyta and lower gymnosperms, the Pteridospermæ and the Cordaitales. The vegetative stem of Cycadales and Coniferales lacks centripetal xylem; but it occurs in a poorly developed condition in certain conservative regions like the reproductive axes and the leaf traces. In the Gnetales and the angiosperms the axial organs show exclusively the endarch condition, and the centripetal xylem is altogether absent from the primary vascular bundles.

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