Begonia xochiatencana from La Montana Region of the state of Guerrero, Mexico, is described and illustrated as a new species. It clearly belongs to Begonia sect. Gireoudia due to its prostrate, rhizomatous habit with radicant leaves, persistent, keeled stipules, staminate and pistillate flowers with 2 tepals, zygomorphic androecia with stamens whose filaments are arranged free from each other on a common receptacle, and 3-locular ovaries. It does, however, differ from the other species due to the presence of several characters that are uncommon in the section: stipules of each pair joined by a band extending from the keels, pubescence of leaves and peduncles consisting of multiseriate trichomes, subsymmetric, palmatilobed leaf blades with the texture and consistency of fabric, bristly above and pitted below, and purple, almost black bracts.

中文翻译：

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Begonia xochiatecana (Begoniaceae), una nueva especie de la sección Gireoudia de Guerrero, 墨西哥

来自墨西哥格雷罗州拉蒙大拿地区的秋海棠被描述和说明为一个新物种。分明属于海棠宗。Gireoudia 由于其匍匐的根状茎习性，具有辐射状的叶子，持久的龙骨状托叶，雄蕊和雌蕊花有 2 个花被片，左右对称的雄蕊花，雄蕊的花丝在一个共同的花托上彼此分开排列，以及 3 室的子房。然而，它确实与其他物种不同，因为该部分存在几个不常见的特征：每对的托叶由从龙骨延伸的带连接，叶和花序梗由多列毛状体组成，半对称，掌叶状叶片具有织物的质地和稠度，上面有刚毛，下面有凹痕，还有紫色，几乎是黑色的苞片。