Development of Air Passages, and Crystal Distribution, in the Stem of Bacopa caroliniana (Scrophulariaceae)

Authors

Nels R. Lersten, Iowa State UniversityFollow
James L. Gunning, Iowa State University

Document Type

Research

Keywords

Scrophulariaceae, Bacopa, stem anatomy, druse crystals

Abstract

About 20 vertical air passages occur in each internode, separated at each node by a solid diaphragm of parenchyma, in which leaf traces depart. Air passages are schizogenous and begin to form just below the shoot apex. This may be the first report of druse crystals in Scrophulariaceae. Druses become visible in the second nodal plate below the shoot apex. In the mature stem, druses are more common in nodes, but they also occur in internodes. The stele appears to be an ectophloic siphonostele, without separate vascular bundles at any stage of development. This appears to be a good species for further study by electron microscopy.

Publication Date

July 1975

Journal Title

Proceedings of the Iowa Academy of Science

Volume

82

Issue

2

First Page

109

Last Page

112

Copyright

©1975 Iowa Academy of Science, Inc.

Language

en

File Format

application/pdf

Recommended Citation

Lersten, Nels R. and Gunning, James L. (1975) "Development of Air Passages, and Crystal Distribution, in the Stem of Bacopa caroliniana (Scrophulariaceae)," Proceedings of the Iowa Academy of Science, 82(2), 109-112.
Available at: https://scholarworks.uni.edu/pias/vol82/iss2/9