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| Dictyanthus reflexiflorus Lozada-Pérez, E.B. Cortez & Martínez-Ambriz, in Lozada-Pérez, Cortez, Perez-Garcia, GONZÁLEZ et Martínez-Ambriz, 2025. |
Abstract
A new species of Dictyanthus from the state of Michoacan, Mexico, is described and illustrated Dictyanthus reflexiflorus sp. nov. It grows in tropical deciduous forests located in the municipality of Tacámbaro. A phylogenetic analysis based on molecular data (plastid regions trnL-trnF and rps 16) was conducted to explore the relationship of the new species. Results place the new species in Dictyanthus. The morphological characters that support this relationship are the presence of uncinate hairs and a reticulate corolla. The species has unique characteristics within the genus, such as a reflexed corolla and the tube 10-lobed closely pressed to the side of the gynostegium. A key to distinguish Dictyanthus reflexiflorus from congeners in Mexico is included.
Asclepiadoideae, endemic, Gonolobinae, Michoacán, phylogeny, Eudicots
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| Dictyanthus reflexiflorus. A. Plant with inflorescences. B. Close-up of branch showing mixed indumentum. C. Close-up of thichomes. D. Colleters at base of leaf-blade. E. Inflorescence. F. Close-up of the indument of the abaxial surface of the corolla. G. Gynostegium with style-head. H. Gynostegial corona lobe in posterior view. I. Gynostegial corona lobe in frontal view. J. Pollinarium. Arrows showing the corolla lobes. Illustrations by Ericka B. Cortez, based on Lozada-Pérez et al. 3835. |
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| Dictyanthus reflexiflorus. A-C. Plant and inflorescences with mature flowers. D. Side view of corolla and gynostegium. E. Dried flower. F. Flower fixed in alcohol. G. Vertical section of corona and gynostegium. (GC: Gynostegial corona, G: Style head, black arrows = tube lobes, gray arrows = corpuscle and blue arrows = keels). Photos by María de la Luz Perez-Garcia and Lucio LozadaPérez. |
Dictyanthus reflexiflorus Lozada-Pérez, E.B. Cortez & Martínez-Ambriz, sp.nov.
Dictyanthus reflexiflorus shares a climbing habit with D. altatensis (Brandegee) Stevens (2000: 243) but differs from it by the reflexed corolla 10-lobed at base and inflorescence with peduncles 3–4 mm long (vs. corolla rotate, without lobes at the base and inflorescence with peduncles 4–8 cm long).
Etymology:—The epithet reflexiflorus refers to the reflexed corolla, a distinctive feature that is unique in
Dictyanthus.
Lucio LOZADA-PÉREZ, Ericka B. CORTEZ, Maria De La Luz PEREZ-GARCIA, César Ramiro Martínez GONZÁLEZ and Emmanuel MARTÍNEZ-AMBRIZ. 2025. Dictyanthus reflexiflorus (Apocynaceae: Asclepiadoideae) A New Species from Mexico. Phytotaxa. 682(3); 199-213. DOI: doi.org/10.11646/phytotaxa.682.3.1
