Two New Species of Matelea (Asclepiadoideae: Gonolobeae; Gonolobinae) from Mexico

Matelea tarrazuana (Apocynaceae, Asclepiadoideae), a new critically endangered ocellate species from Central Pacific of Costa Rica

“…The description and illustration were based on live and dried material. Stevens (2009) and Cortez et al (2018) were followed for the morphological terminology. Ecological life zone is described according to Holdridge et al (1971).…”

“…(Asclepiadoideae) is one of the largest genera within Apocynaceae comprising approximately 225 species worldwide (McDonnell 2014). It comprises herbaceous or woody neotropical vines (Stevens 2009, Cortez et al 2018, Morales & Stevens 2020, and is the largest genus in the New World subtribe Gonolobinae (G. Don.)…”

A New Species of Matelea (Apocynaceae, Asclepiadoideae) from the Península de Nicoya, Guanacaste, Costa Rica

“…Here we follow the Matelea concept according to Morales and Stevens (2020), which is a group of mostly herbaceous or woody vines, with a mixed indument of long, short, and glandular hairs, the glandular hairs always colored; extra-axillary inflorescences; rotate or campanulate corollas; staminal corona fused to the base of the corolla or the gynostegium; and horizontal or subhorizontal pollinia laterally excavated and sterile near the union with the caudicle (Stevens, 2009;Cortez et al, 2018;Morales & Stevens, 2020). Matelea is closely related morphologically and genetically to Gonolobus Michx., from which it can be distinguished from the latter by the common absence of a faucial ring surrounding the corona (though one is rarely present) and its anthers without dorsal appendages, whereas Gonolobus presents a faucial ring surrounding the co-Volume 31 2023 Jiménez et al 89 New Species of Matelea (Apocynaceae) from Costa Rica rona, sometimes reduced to a ridge or a line, and the anthers usually have fleshy or, less frequently, lamellar dorsal appendages (Stevens, 2009;Morales & Stevens, 2020).…”

“…Nevertheless, though some characters have been useful to delimit clades, more evidence and documentation, including stronger phylogenetic hypotheses, are still necessary (McDonnell et al, 2018). Despite the lack of monophyly of Matelea s.l., several new species have been described following the traditional circumscription of the genus (Cortez et al, 2018; Alvarado-Cárdenas et al, 2020; Jiménez & Hidalgo-Mora, 2021; Juárez-Jaimes et al, 2021).…”