Oxypetalum marchesii (Apocynaceae, Asclepiadoideae), an endemic new species from Uruguay

GONZÁLEZ, A.; FERNÁNDEZ, M.; EZCURRA, C.

SYSTEMATIC BOTANY

AMER SOC PLANT TAXONOMISTS

Lugar: Laramie; Año: 2018

0363-6445

A new species, Oxypetalum marchesii, from rocky grassland environments of Uruguay, is here described, illustrated, and compared tomorphologically similar species. Data on its habitat, distribution, ecology, and conservation status are also provided. Based on its cpDNA, O.marchesii clearly corresponds to the recently re-circumscribed and morphologically diverse genus Oxypetalum. This species is mostly characterized byits creeping, non-twining habit, widely ovate and shortly petiolate hirsute leaves, relatively large flowers with pale greyish corollas, and short stylarheadappendage that is included within a corona formed of oblong-lanceolate, bifurcate lobes. The conservation status of this species is consideredvulnerable because of its small geographic range and restricted population size.Keywords?cpDNA, conservation, flower morphology, grasslands, Oxypetalinae, Pampas flora.