Details - The woods and flora of the Florida Keys : "Pinnatae"

The woods and flora of the Florida Keys

Title

The woods and flora of the Florida Keys : "Pinnatae"

Title Variants

Alternative: Pinnatae

Related Titles

Series: Contribution (Maryland Agricultural Experiment Station), no. 4506

Series: Smithsonian contributions to botany, no. 5

By

Rock, Barrett Nelson.

Type

Book

Material

Published material

Publication info

Washington, Smithsonian Institution Press, 1972

Notes

The “Pinnatae,” comprising six families of woody plants with pinnately compound leaves, is represented on the Florida Keys by at least 16 species. The taxonomic treatment of these families at the ordinal level has been inconsistent. The purpose of this study is to correlate the data derived from intensive study of the xylem anatomy of these 16 species with data from the literature concerning these and other members of the families involved, so that new insight might be gained concerning the taxonomic relationships among these families.This study indicates that the members of the Pinnatae are anatomically homogeneous. All members possess simple perforation plates, vessel elements having alternate intervascular pitting, fibrous elements with small slitlike simple to vestigially bordered pits, and apotracheal and paratracheal axial parenchyma, or both. Secretory structures, such as crystalliferous idioblasts, parenchymatous cells containing “gum,” and intercellular canals, are of wide occurrence within the Pinnatae. In addition, many species possess septate fibers and axial parenchyma arranged in aggregate patterns, with banded arrangements being most frequent.There is no anatomical basis for the separation of families into distinct orders in my view. The only separation of families within the Pinnatae suggested by a syndrome of several unique characters, in addition to those common to all members, is the formation of an Anacardiaceae-Burseraceae complex. The members of the Pinnatae belong to a taxon corresponding well with Cronquist's Sapindales.Phylogenetically, the Pinnatae constitutes an advanced taxon, based on xylem anatomy.