Studies on the origin, evolution, and distribution of the Gramineae. III. The tribes of the subfamily Eragrostoideae
Studies on the origin, evolution, and distribution of the Gramineae. III. The tribes of the subfamily Eragrostoideae
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DOI：
10.1071/bt9600256
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发表时间：
1960-01-01
期刊：
影响因子：
--
通讯作者：
SLATER, CHRISTINE
中科院分区：
文献类型：
--
作者：
HARTLEY, W.;SLATER, CHRISTINE
在对草类分布的进一步研究中，提出了显示稻草亚科及其所属的稻草亚科世界分布的地图。这两个分类群在澳大利亚内陆和西南非洲都显示出高度的相对特异分化中心，但除此之外，该亚科在撒哈拉地区、墨西哥北部和印度西北部也有分化中心。分化的中心都在靠近巨蟹座和摩羯座的热带地区炎热、干旱的气候。气候与分布的密切关系在Eragrostoideae亚科中最为明显，该亚科在所有冬季温度高、夏季或非季节性降雨的干旱地区的禾草植物区系中物种相对丰富。其他大部分已被划归到Eragrostoideae的部落和亚部落的分布与气候也表现出类似的关系。讨论了一些明显的例外情况，并表明地理证据支持最近的细胞分类学和解剖学研究的结论，即有关分类群应该从亚科中移除。该亚科及其组成分类群的广泛分布以及分布格局与气候的密切关系表明该亚科是一个非常古老的亚科。地理和分类学证据表明，它可能至少早在渐新世就起源于热带或亚热带非洲。摘要作者：作者
In further studies of grass distribution, maps are presented showing the world distribution of the Eragrosteae (sensu str.) and of the subfamily Eragrostoideae within which it is included. Both taxa show centres of high relative specific differentiation in inland Australia and in South West Africa, but in addition, the subfamily has centres of differentiation in the Sahara region, northern Mexico, and north-western India. The centres of differentiation are all in regions of hot, arid climate near the tropics of Cancer and Capricorn. The close relationship between climate and distribution is most apparent in the case of the subfamily Eragrostoideae, species of which are relatively abundant in the grass flora of all arid regions with high winter temperatures and summer or non-seasonal rainfall incidence. The distributions of most of the other tribes and subtribes which have been included in the Eragrostoideae show a similar relationship to climate. Some apparent exceptions to this are discussed, and it is shown that the geographical evidence supports conclusions from recent cytotaxonomic and anatomical studies that the taxa concerned should be removed from the subfamily. The very wide distribution of the subfamily and of its constituent taxa, as well as the close relationship between the distribution pattern and climate, suggests that the subfamily is a very old one. Geographical and taxonomic evidence indicates that it may have originated in tropical or subtropical Africa at least as early as the Oligocene. || ABSTRACT AUTHORS: Authors