Samain Marie-Stéphanie, Granados Mendoza Carolina, Martínez Salas Esteban Manuel
Red de Diversidad Biológica del Occidente Mexicano, Instituto de Ecología, A.C., 61600 Pátzcuaro, Michoacán, Mexico.
Departamento de Botánica, Instituto de Biología, Universidad Nacional Autónoma de México, 04510, Mexico City, Mexico.
PhytoKeys. 2021 Jan 26;171:91-153. doi: 10.3897/phytokeys.171.56351. eCollection 2021.
Hydrangea section Cornidia, currently consisting of 19 accepted taxa, occurs from Mexico to Chile and Argentina, with one species in southeast Asia. Its representatives are root-climbing lianas which may grow up to 60 m high in the tree canopy of temperate to (sub)tropical forests. Our extensive field work throughout its distribution area, study of herbarium specimens and ongoing molecular studies have resulted in the discovery of species new to science, as well as new insights into the circumscription of many taxa. We here present amended descriptions for seven species of Central and South America and discuss the taxonomical situation of two Colombian Hydrangeas, including an identification key, illustrations, and distribution maps. Field work was carried out in Costa Rica, Panama, Ecuador and Peru, including exploration in areas where the genus had not been collected before. These specimens and observations were complemented with the study of specimens of 41 herbaria of North, Central and South America, as well as Europe. Detailed morphological studies of all species were carried out, based on living plants in their natural habitat, as well as on dried specimens from our own collections and all available herbarium material. Type material was studied in detail for all species concerned. Based on an extensive number of morphological characters, combined with distribution patterns, phenological differences and ecological preferences, including molecular data in most cases, and are clearly distinct taxa, as well as the other seven species mentioned here, which had been synonymized with either of these two species. The present study results in the recognition of 26 species in section Cornidia and exemplifies the urgent need for profound taxonomic studies in plants, as in many families we do not dispose of well-circumscribed units for conservation to mitigate the already occurring unprecedented loss of biodiversity.
绣球花属Cornidia组目前包含19个已被接受的分类群，分布于从墨西哥到智利和阿根廷的地区，在东南亚有一个物种。其代表植物是攀缘根藤本植物，在温带至（亚）热带森林的树冠层中可长到60米高。我们在其分布区域进行了广泛的野外工作，研究了标本馆的标本，并开展了正在进行的分子研究，这些工作带来了新科学物种的发现，以及对许多分类群界定的新认识。我们在此给出中美洲和南美洲7个物种的修订描述，并讨论两种哥伦比亚绣球花的分类情况，包括鉴定检索表、插图和分布图。野外工作在哥斯达黎加、巴拿马、厄瓜多尔和秘鲁开展，包括在该属此前未被采集过的地区进行探索。这些标本和观察结果得到了对北美、中美、南美以及欧洲41个标本馆标本的研究的补充。基于自然栖息地中的活体植物、我们自己采集的干燥标本以及所有可用的标本馆材料，对所有物种进行了详细的形态学研究。对所有相关物种的模式标本进行了详细研究。基于大量的形态特征，结合分布模式、物候差异和生态偏好，在大多数情况下还包括分子数据， 以及其他七个物种，这些物种在此之前一直被视为这两个物种中的一个的同义词。本研究结果确认了Cornidia组中有26个物种，并例证了对植物进行深入分类研究的迫切需求，因为在许多科中，我们没有明确界定的分类单元用于保护，以减轻已经发生的前所未有的生物多样性丧失。
