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Issue: Vol. 671 No. 1: 7 Nov. 2024
Type: Article
Published: 2024-11-07
DOI: 10.11646/phytotaxa.671.1.3
Page range: 59-76
Abstract views: 107
PDF downloaded: 6

Understanding the anatomical diversity of leaves in the Aspicarpoid clade: New insights for Malpighiaceae systematics

Universidade Estadual do Piauí-UESPI, Campus Heróis do Jenipapo, 64280-000, Campo Maior, Piauí, Brazil
Universidade Estadual do Piauí-UESPI, Campus Drª. Josefina Demes, 64800-000, Floriano, Piauí, Brazil
Pós-Graduação em Botânica, Departamento de Biologia Vegetal, Universidade Federal de Viçosa, 36570-900, Viçosa, MG, Brazil
Universidade Estadual do Piauí-UESPI, Campus Heróis do Jenipapo, 64280-000, Campo Maior, Piauí, Brazil
Aspicarpa character evolution Cottsia Gaudichaudia Janusia Eudicots leaf glands

Abstract

The Aspicarpoid clade represents a strongly supported group within the Stigmaphylloid lineage. The group is composed of four neotropical genera: Aspicarpa Rich., Gaudichaudia Kunth, Janusia A.Juss. and Peregrina W.R.Anderson. In this study, we studied the utility of leaf anatomy characters to support groups recovered in molecular phylogenies and define synapomorphies that can be used in future infra- and supra-generic classifications. Camarea axillaris A.St.-Hil. (1823: 10) and Cottsia Dubard & Dop (1908: 20) were used as outgroups for comparison. Dry leaf samples were re-hydrated, sectioned, stained, and analyzed using a microscope and a stereomicroscope. Characters such as presence and absence of glands, their location and morphotype, petiole and midrib contour, presence of trichomes, accessory bundles, vascular system organization and mesophyll type were utilized for species comparison, showing high taxonomic value for the group. Leaf glands, accessory bundles, sheath extension in the mesophyll and presence of druses and prismatic crystals were the most valuable characters in an evolutionary approach for the clade. Our work confirms the power of leaf anatomy as a taxonomic and evolutionary tool in Malpighiaceae Juss. (1789: 252), as well as its contribution to the delimitation of phylogenetic groups in the Aspicarpoid clade.

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