Wood Structure of Jablonskia congesta (Euphorbiaceae)

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Abstract
The wood of Jablonskia, a new monotypic genus up till now considered to belong in Securinega, differs from that of Securinega in various respects. It would be better accommodated anatomically in Flueggea sensu Webster, except for the presence of scalariform perforation plates in some of the vessels. This feature is not known in any of the genera of Phyllantheae (sensu Webster 1975) with the exception of Chascotheca neopeltandra. The wood structure of Jablonskia is characterized by narrow vessels in short radial rows, small intervascular pits, imperforate tracheary elements consisting of septate and non-septate libriform fibers of moderate length, rays uniseriate and multiseriate, the latter heterogeneous with long uniseriate extensions of tall upright cells, large vessel/ray pitting, and very scarce vasicentric parenchyma. This combination of features occurs in some taxa of Antidesmeae, e.g., in Celianella and Antidesma. The anatomical structure of taxa of Aporuseae shows less similarity to the wood of Jablonskia.

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