Taxonomia e anatomia foliar de para gonia pyramidata l. (rich) dc

Abstract

The Bignoniaceae are plants with woody, shrubby and mainly climbing (lianas) habitats. It has approximately 120 genera with about 650 species. It is a predominantly tropical family, and is distributed in various ecosystems, including restingas. This work aims to study the taxonomy and anatomy of the species Paragonia pyramidata L., the only representative of the Bignoniaceae family in the sandbanks of the Algodoal APA. The material for the study was collected on the islands of Algodoal and Maiandeua - APA (Environmental Protection Areas). For anatomical analysis the material was fixed in alcohol 70% for later epidermis dissociation, diaphanization and cross sections. As a result, it was observed that, in frontal view, the leaf limb is covered by a striated cuticle, with glandular trichomes on both faces and with stomas restricted to the abaxial face (hypoestomatic). In cross sections it was noted that the leaflet is dorso-ventral, with uni or biseriate hypodermis near the adaxial epidermis which is formed by colorless cells, larger than the epidermal cells. The epidermal cells over the vein are quite elongated. The vascular bundles are collateral and dispersed in the mesophyll, which are protected by a fibrous sheath. The diaphanized leaf indicates that the network of ribs follows a brochedrome pattern (i.e., the secondary ribs join to form arches, without reaching the leaf margin. The petiole presents a vascular ring where a layer of fibers occurs at the phloem level. The observed characteristics are peculiar to the species.