Siderasis albofasciata sp. nov. (Commelinaceae), endemic to the state of Espírito Santo, Brazil, and the typification of S. fuscata

A new species of Siderasis from the state of Espírito Santo is here described. This new species is readily differentiated from S. fuscata by its sessile to subpetiolate leaves covered by hyaline to light-brown indumenta, blades with a well-defined white stripe along the midvein on the adaxial side of the blade, main axis of the main florescence elongate, thyrsi reduced to one elongate cincinnus, bracteoles present, anthers purple to bluish–purple, filaments and style apically purple to bluish–purple, aril cream-colored and slightly hyaline, and by the production of unique axillary flagelliform-shoots after the flowering period. I present a description of this new species, along with illustrations, a distribution map, comments on conservation assessment, ecology and taxonomy, and a table comparing the new species with the only other accepted species in Siderasis. Furthermore, I designate a lectotype and an epitype for S. fuscata.本文记述了产自巴西圣埃斯皮里图州的银宝草属（Siderasis）一新种。该新种可通过以下特征与褐叶银宝草（S. fuscata）显著区分：叶无柄至近无柄，被透明至浅褐色毛被；叶片腹面沿中脉具清晰白色条纹；总花序主轴伸长，聚伞圆锥花序退化为单个伸长的蝎尾状聚伞花序；具小苞片；花药呈紫色至蓝紫色；花丝及花柱顶端为紫色至蓝紫色；假种皮乳黄色且略带透明；花期后可产生独特的腋生鞭状新芽。本文对该新种进行了详细描述，同时附上形态插图、分布图、物种保护评估、生态学及分类学讨论，并设置对比表格，将该新种与银宝草属内目前唯一被认可的另一种进行比对。此外，本文为褐叶银宝草（S. fuscata）指定了后选模式标本与新模式标本。