<em>Centrosema flavescens</em> (Fabaceae, Papilionoideae), a new species from the Yucatan Peninsula, Mexico

Background: Centrosema (Fabaceae) includes 35-44 species in the New World, 10 Mexico, and 9 Yucatan Peninsula. Most have trifoliolate leaves bicolored flowers. Unifoliolate are an infrequent character that is found a few species, e.g., C. sagittatum (Humb. & Bonpl. ex Willd.) Brandegee, but monochromatic flowers, e.g, lacking nectar guides, even more unusual state. Several populations of from Peninsula share both states, combination sets them apart other members genus.
 Question: Is with unifoliolate leaves, alate petioles, flowers Peninsula, distinct phenetically similar sagittatum?
 Studies species: (Fabaceae, Papilionoideae).
 Study site dates: 2021-2023.
 Methods: Botanical specimens were collected determined taxonomically through use relevant literature, keys, consulting botanical collections. The conservation status new was assessed using IUCN methodology.
 Results: do represent undescribed differs by its smaller, cream-yellow, as Endangered (EN).
 Conclusions: A flavescens proposed. Eleven now recognized nine does not occur peninsula.