Bronwenia
Creators: name: Vilarinho, Milena Pereira
name: Santos, João Victor Da Costa
name: Santos-Filho, Francisco Soares
name: Araújo, Josiane Silva
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Malpighiales
Malpighiaceae
Bronwenia

description: Bronwenia species identification key
1. Presence of malpighiaceous trichomes on the leaf blade (Fig.2F).....................................................................................................2
- Absence of malpighiaceous trichomes on the leaf blade....................................................................................................................6
2. Presence of bundle sheath extension in the mesophyll (Fig.3F, G)....................................................................................................3
- Absence of bundle sheath extension in the mesophyll.......................................................................................................................4
3. Plane-convex contour of petiole (Fig. 2E); absence of accessory bundles on the petiole; conformation of the vascular system in an open arch on the petiole (Fig. 2G); conformation of the vascular system in an open arch with convoluted ends in the midrib (Fig. 3E); absence of leaf glands on the petiole ..................................................................................................... Bronwenia acapulcensis
- Concave-convex petiole contour (Fig.2D); presence of accessory bundles on the petiole (Fig. 2D, E); conformation of the vascular system in an open arch with convoluted ends on the petiole (Fig. 2D, E); conformation of the vascular system in an open arch in the midrib (Fig. 3D); presence of leaf glands on the petiole (Fig.1A) ............................................................. Bronwenia megaptera
4. Plane-convex contour of petiole (Fig.2E); absence of leaf glands on the petiole ............................................ Bronwenia mathiasiae
- Concave-convex petiole contour (Fig.2D); presence of leaf glands on the petiole (Fig.1A).............................................................5
5. Flat surface glands (Fig.1 C-1D); presence of idioblasts (Fig.3B, C)............................................................... Bronwenia cineracens
- Concave surface glands (Fig. 1F); absence of idioblasts ................................................................................. Bronwenia ferruginea
6. Convex surface glands (Fig. 1B, E); presence of bundle sheath extension in the mesophyll (Fig. 3F, G); absence of dairy products; absence of secretory cavities ............................................................................................................................. Bronwenia cornifolia
- Flat surface glands (Fig.1C, D); absence of bundle sheath extension in the mesophyll; presence of laticifers (Fig.3H, I); presence of secretory cavities (Fig. 2C) ........................................................................................................................... Bronwenia wurdackii
Multivariate analysis: —From the analysis of similarity with UPGMA (Fig.5) the species of Bronwenia were grouped according to the degree of similarity of the anatomical characters analyzed. The highest degree of similarity pointed out in the analysis occurred between the species Bronwenia cineracens and B. ferruginea as they share 15 similar characteristics, such as: presence of external leaf glands on the leaf, concave-convex contour, glands with convex surface, presence of prismatic crystals on the leaf and irregular quinternary veins. Another group was formed by B. cineracens, B. ferruginea, B. megaptera and B. mathiasiae that present the same type of conformation of the vascular system of the petiole/ midrib and the presence of accessory bundles in the petiole. The species B. acapulcensis and B. wurdackii share the presence of external leaf glands among the other species, however, B. acapulcensis presents a low degree of similarity, and this fact is explained by the exclusivity in the type of conformation of the petiole/ midrib vascular system main beam and absence of accessory beams. Bronwenia wurdackii was the species with the lowest degree of similarity with the other taxa, due to the presence of exclusive characteristics such as the presence of laticifers and secretory structures that visually resemble secretory cavities, but further studies are needed to determine the type of structure.
description: Published as part of Vilarinho, Milena Pereira, Santos, João Victor Da Costa, Santos-Filho, Francisco Soares & Araújo, Josiane Silva, 2023, Contributions of leaf morphoanatomy to the taxonomy of Bronwenia (Malpighiaceae Juss.), pp. 252-264 in Phytotaxa 599 (4) on pages 258-260, DOI: 10.11646/phytotaxa.599.4.4, http://zenodo.org/record/8030251