Going underground: another geoxylic species of Psidium (Myrtaceae) is discovered in the Cerrado biome
DOI:
https://doi.org/10.70782/heringeriana.v19ib.918080Palavras-chave:
fire, Myrtaceae, rhizome, vegetative propagationResumo
Psidium is a Neotropical, species rich genus that is distributed from Chihuahua, Mexico to Buenos Aires, Argentina. It is very variable in habit and habitat, ranging from subshrubs to large trees in forests and savannas. In the fire-prone savannas of South America, such as the Cerrado, several mechanisms to resist or tolerate fire evolved in woody genera. Specialized underground organs hide buds and biomass underground. One of these is the geoxylic habit, where the plant shows significant underground biomass and propagates vegetatively through an extensive network of rhizomes. In Myrtaceae, this type of habit has been recorded in Eugenia and Psidium. Herein, we elevate a variety to species level: Psidium eustachyum, a geoxylic species from the Cerrado biome. This species is distinguished from other species of Psidium by its low height, geoxylic habit, glabrous leaves that are usually less than 4cm long with an inconspicuous venation, 2(-3) locules in the ovary, few ovules per locule (8-11) and up to 5 seeds per fruit. P. eustachyum was recently described as P. salutare var. resiliens; however, an ongoing phylogenetic study shows that the two taxa are not closely related and in fact belong to different sections (P. salutare to Psidium sect. Mitranthes and P. eustachyum to Psidium sect. Apertiflora). Combined with morphological evidence, these results indicate new status at species level is in order for this geoxylic entity.
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Copyright (c) 2026 Carolyn Proença, Lázaro Henrique Soares de Moraes Conceição
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