Two new species of Serjania (Sapindaceae) from Michoacán, Mexico, with notes on S. biternata

Serjania rosalindae and S. crucensis (Sapindaceae-Paullinieae), new species from the municipality of La Huacana, Michoacán, Mexico, are described, illustrated, and compared with closely related species. In addition, micromorphological features of the leaves, flowers, and pollen grains are investigated. A treatment of the endemic S. biternata from Guerrero is also included because it is a little-known taxon similar to S. rosalindae whose fruits were previously unknown. All of these taxa share capsules that are chartaceous to almost woody and septifragal, a fruit type otherwise uncommon within Serjania. The distinctive fruit morphology of these species is discussed in relation to other species of Serjania.

本文记述了产自墨西哥米却肯州拉瓦卡纳市的两个蛇藤属（Serjania）新物种——罗莎琳德蛇藤（Serjania rosalindae）与十字蛇藤（Serjania crucensis），二者隶属于无患子科（Sapindaceae）异木患族（Paullinieae），对其进行了形态描述、绘图，并与近缘物种开展对比研究。此外，本研究还对这两个新种的叶片、花及花粉粒的微观形态特征进行了观测分析。
同时，本文还纳入了产自格雷罗州的特有种二回三出叶蛇藤（Serjania biternata）的分类处理，该类群鲜为人知，与罗莎琳德蛇藤形态相似，且其果实此前尚未被报道。上述类群均具有膜质至近木质、沿隔膜开裂的蒴果，这一果实在蛇藤属内较为罕见。本文结合蛇藤属其他物种，讨论了这些物种独特的果实形态特征。