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Journal Article

The Seedling of Ceratozamia

Helen A. Dorety
Botanical Gazette
Vol. 46, No. 3 (Sep., 1908), pp. 203-220
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Page Count: 23

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Topics: Cotyledons, Seedlings, Leaves, Plant roots, Xylem, Plants, Embryos, Cambium, Cylinders, Stems
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1. Ceratozamia is dicotyledonous, the second cotyledon being aborted by gravity. 2. The cotyledon is often lobed at the tip. It is multifascicular, and all the bundles are derived from three. The wood is mesarch at the base and exarch in the upper portion. Mucilage ducts usually alternate with the bundles. 3. The leaf traces are at first vertical; girdling follows upon increase in radial growth of the enclosed leaves and stem apex. The wood of the leaf traces is endarch in the central cylinder, but becomes mesarch in the leaf base and remains so to the tips of the pinnae. 4. The scale leaves are aborted foliage leaves. 5. The first-formed portion of the central vascular cylinder may be a protostele. 6. The stem is a sympodium. 7. There are several layers of extrafascicular cambium, but in seedlings two years old only the slightest trace of anomalous thickening. 8. The root is a delayed organ, and its four poles are inserted upon the cotyledonary bundles. 9. The entire xylem system of the root is bordered peripherally by cambium.

Notes and References

This item contains 20 references.

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