Bombacoideae, Byttnerioideae, Grewioideae and Helicterioideae (Malvaceae s.l.) in the Raso da Catarina Ecoregion, Bahia, Brazil

Abstract: This work presents a floristic survey of the subfamilies Bombacoideae, Byttnerioideae, Grewioideae and Helicterioideae (Malvaceae s.l.) in the Raso da Catarina Ecoregion (RCE), Bahia, Brazil. The samples analyzed were collected from September 2013 to May 2015. The analyses were supplemented with dried collections kept in the herbaria: ALCB, HRB, HUEFS, HUNEB, HST, IPA, PEUFR, R and RB. The identifications were based mainly on specialized bibliographies, protologues, types and herbaria collections. Ten genera and 22 species of the subfamilies were recorded, nine endemic to Brazil. Waltheria L. was the most representative genus with five species, followed by Ceiba Mill. and Melochia L. with three species each, Helicteres L., Luehea Willd., Pachira Aubl. and Pseudobombax Dugand presented two species each and other genera were represented by one species each. Among the species recorded, Luehea candicans Mart. represents a new record for the Caatinga biome. The species most commonly found in the study area were Helicteres velutina K.Schum., Melochia tomentosa L., Waltheria brachypetala Turcz., W. indica L. and W. rotundifolia Schrank. The taxonomic treatment includes identification key, descriptions, illustrations, photos, geographical distribution, reproductive phenology and comments about all studied species. Keywords: biodiversity, Caatinga, morphology, semiarid, taxonomy.

摘要：本研究针对巴西巴伊亚州拉索达卡塔里纳生态区（Raso da Catarina Ecoregion，RCE）内的广义锦葵科（Malvaceae s.l.）下的木棉亚科（Bombacoideae）、刺果藤亚科（Byttnerioideae）、扁担杆亚科（Grewioideae）及翅子树亚科（Helicterioideae）开展植物区系调查。研究标本采集于2013年9月至2015年5月，并辅以保藏于ALCB、HRB、HUEFS、HUNEB、HST、IPA、PEUFR、R及RB标本馆的干燥馆藏标本。物种鉴定主要依托专业参考文献、原始发表文献、模式标本及馆藏标本。本次调查共记录该4个亚科下的10个属共计22个物种，其中9个为巴西特有物种。其中，沃尔瑟木属（Waltheria L.）为最具代表性的类群，含5个物种；其次为吉贝属（Ceiba Mill.）与马松子属（Melochia L.），各含3个物种；火索麻属（Helicteres L.）、桐棉属（Luehea Willd.）、瓜栗属（Pachira Aubl.）及假吉贝属（Pseudobombax Dugand）各含2个物种，其余属均仅含1个物种。在所记录的物种中，白桐棉（Luehea candicans Mart.）为卡廷加生物群区（Caatinga biome）的新分布记录。研究区域内最为常见的物种包括：绒毛火索麻（Helicteres velutina K.Schum.）、绒毛马松子（Melochia tomentosa L.）、短瓣沃尔瑟木（Waltheria brachypetala Turcz.）、印度沃尔瑟木（W. indica L.）及圆叶沃尔瑟木（W. rotundifolia Schrank.）。本研究的分类学处理涵盖所有研究物种的分种检索表、形态描述、图解、照片、地理分布、生殖物候及相关评述。关键词：生物多样性、卡廷加生物群区、形态学、半干旱、分类学。