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— Several taxonomic novelties of the genus Sisyrinchium have been presented recently, so for some specialists this reveals the need of more systematic studies on the genus to better understand its diversity. They have also pointed out some regions as those of more priority to be explored. One of these is northwestern Mexico, in which after a floristic inventory in a Natural Protected Area in Sierra Madre Occidental, a new species was discovered. It is here described and illustrated as Sisyrinchium jacquelineanum, and diagnosed against S. polycladum, the morphologically most similar species. It differs from this by the growth habit, position of root thickenings, absence of fibrous remnants of old leaves at the base of the stem, flower size, and in the shape and pubescence of the capsules. An identification key for the 16 species of Sisyrinchium present in the Sierra Madre Occidental and an analysis of their richness patterns throughout this province are also provided.

Antecedentes y Objetivos: Durante exploraciones en los límites exteriores del Área Natural Protegida Sierra de Tacuichamona, zona rica en endemismos de Sinaloa, México, se descubrió una especie nueva de Coutaportla (Rubiaceae). El objetivo del presente trabajo es describir e ilustrar a Coutaportla helgae, proveer una clave de identificación y un mapa de distribución, y discutir las relaciones morfológicas y geográficas con el resto de las especies del género. Métodos: Se realizaron colectas botánicas durante 2021 y 2022, y se revisaron 15 herbarios y bases digitales para comparar con otras especies del género y localizar posibles localidades adicionales. Empleando el polígono de la Sierra Madre Occidental se elaboró un mapa de distribución. Resultados clave: Coutaportla helgae se destaca del resto de especies del género al poseer las flores más pequeñas del grupo. Se relaciona morfológicamente con C. lorenceana al ser las únicas especies del género con placentación subapical y lóbulos del cáliz menor a la mitad del largo del fruto, pero se diferencia de esta por tener flores de menor tamaño, corolas blanco-púrpuras, hábito arbustivo y distribución en selva baja caducifolia. Conclusiones: Con el presente descubrimiento, el género Coutaportla llega a cuatro especies endémicas de México y cinco en total, considerando a C. guatemalensis. Coutaportla helgae aporta nuevas características al género, pues posee las flores más pequeñas y crece a menores altitudes que el resto. Adicionalmente, se aportan elementos para apoyar la conservación de sitios altos en biodiversidad y endemismos como la Sierra Tacuichamona.

Recent botanical explorations in Sierra Madre Occidental in Durango, Mexico, led to the discovery of a new species which according to its morphology belongs to Salvia sect. Brandegeia. The new taxon is morphologically most similar to S. oresbia from central Mexico, against which it is thoroughly compared. Additionally, it is presented a synopsis of the section in order to provide updated and standardized descriptions for those species known only in base to their protologues, which allows a more detailed and precise comparison in respect to the new species. The morphological examination of the species in the section also revealed that the recognition of S. sharpii as a distinct species from S. blepharophylla is not justified; consequently, it is reduced to synonymy. An identification key, a distribution map, photographs, and a drawing of the new species are also presented.

Bletia santosii, a new species from Sinaloa, Mexico, is described and illustrated. Morphologically, B. santosii is similar to B. parkinsonii and B. mixtecana. However, it differs consistently from those species in multiple aspects of its morphology, as well as in habitat preferences and phenology. It was discovered while carrying out a floristic inventory of El Palmito Sanctuary, a natural protected area in the municipality of Concordia, Sinaloa, Mexico. A description, photographs, diagnostic character comparison with morphologically most similar species, and comments about the habitat are provided.

Lobelia macrocentron (Campanulaceae) was rediscovered when conducting floristic sampling for the Flora inventory of Santuario El Palmito, a natural protected area in the municipality of Concordia, Sinaloa, Mexico. The species was discovered 169 years ago by B.C. Seemann between 1849 and 1850, as part of one of the inland explorations of the Herald’s voyage. Seemann’s specimens served as the type and only known collection of the species. The locality of Seemann’s collections is imprecisely described, so that any search attempt would require an extensive exploration in portions of the states of Durango, Nayarit and Sinaloa, covering more than 350 km of Seemann’s route. Also, morphological variation of L. macrocentron was poorly understood as restricted by the only two available specimens. Consequently, we provide an extended description of the species, color plates with the first available photographs, and discussions about relationships, habitat and conservation status.