Lewis G P, Siqueira G S, Banks H, Bruneau A
1Comparative Plant and Fungal Biology Department, Royal Botanic Gardens, Kew, Richmond, Surrey TW9 3AB UK.
Herbário - Reserva Natural Vale, Meio Ambiente, BR 101, km 122, s/n., Caixa Postal 91, Sooretama, Espírito Santo 29.927-000 Brazil.
Kew Bull. 2017;72(3):48. doi: 10.1007/s12225-017-9720-7. Epub 2017 Oct 6.
Since its description, almost 100 years ago, the genus has been treated as monospecific, comprising the single canopy-emergent species Ducke which grows in non-flooded Amazonian forests of Guyana, Suriname and seven states of northern and central-western Brazil. G. P. Lewis & G. S. Siqueira, which grows in a restricted area of semi-deciduous Atlantic rain forest in Espírito Santo state, Brazil, is described as a new species in the genus. The new species is also a canopy-emergent of impressive stature. We provide descriptions for both species, a key to species identification, a distribution map and the new species is illustrated. Fossil leaves, inflorescences and fruit provide evidence for a -like ancestor occurring in south-eastern North America during the Eocene. In contrast to where pollen is dispersed in tetrads, the pollen of is shed in monads. is considered critically endangered following IUCN conservation criteria, whereas is assessed to be of least concern. A lectotype is designated for .
自约100年前该属被描述以来，它一直被视为单种属，仅包含一种冠层突出树种——杜克木，生长在圭亚那、苏里南以及巴西北部和中西部七个州的非水淹亚马逊森林中。在巴西圣埃斯皮里图州半落叶大西洋雨林的一个有限区域生长的G. P. 刘易斯和G. S. 西凯拉木，被描述为该属的一个新物种。这个新物种也是一种具有令人印象深刻树高的冠层突出树种。我们提供了这两个物种的描述、物种鉴定检索表、分布图，并对新物种进行了绘图说明。化石树叶、花序和果实为始新世时期出现在北美东南部的一种类似该属的祖先提供了证据。与花粉以四分体形式散布的杜克木不同，G. P. 刘易斯和G. S. 西凯拉木花粉以单粒形式散落。根据世界自然保护联盟的保护标准，杜克木被认为极度濒危，而G. P. 刘易斯和G. S. 西凯拉木被评估为关注程度最低。为杜克木指定了一个后选模式标本。
