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A monograph of the genus Polhillia (Genisteae: Fabaceae)
South African Journal of Botany ( IF 3.1 ) Pub Date : 2021-01-09 , DOI: 10.1016/j.sajb.2020.12.022
B. du Preez , L.L. Dreyer , C.H. Stirton , A.M. Muasya

Polhillia is a small, but poorly known genus of legumes endemic to the Greater Cape Floristic Region (GCFR) of South Africa. The genus was described three decades ago to accommodate species erroneously placed in Argyrolobium and other Cape legume genera. Polhillia is the third most threatened plant genus in South Africa, hence priority for taxonomic study and current knowledge on distribution patterns are essential for conservation interventions. Eight species were known at the start of this study, all of which are threatened with extinction. Species boundaries were, however, unclear and many Renosterveld fragments, in particular in the Overberg, required further exploration in pursuit of the various Polhillia species. The phylogenetic relationships among species and monophyly of the genus, especially regarding the position of the morphological aberrant P. involucrata, had not been tested. This study was built upon a foundation of widespread field sampling and analysis of herbarium specimens. Having considered morphological, anatomical, palynological and molecular data, we present an updated taxonomy of the genus Polhillia. Morphological characters between species were often obscure and unique characters were uncommon, as such species are recognized based on unique combinations of characters. Pollen and leaf anatomical studies did not provide substantial taxonomically informative characters, although some interspecific differences were noted. Molecular phylogenetic reconstructions confirm Polhillia to be monophyletic and sister to Argyrolobium, and that Argyrolobium may not be monophyletic. The morphologically distinct species, P. involucrata, is strongly supported as sister to the rest of the genus. Internal phylogenetic resolution in Polhillia is weak in many clades, due to the low variability among DNA markers studied, and several polytomies are still present. Based on the morphological and molecular evidence, we place P. involucrata in the new monotypic subgenus Roseopolhillia. Four new species are described (P. fortunata B.du Preez, P. groenewaldii B.du Preez, P. stirtoniana B.du Preez, P. xairuensis B.du Preez), and a previously recognized species (P. canescens C.H.Stirt.) is placed in synonymy under P. connata (Harv.) C.H.Stirt. Red data list assessments are provided for all species to highlight their conservation importance. Maps and compound colour plates are provided for each species.



中文翻译:

Polhillia属专​​着(Genisteae:豆科)

Polhillia是南非大开普植物区(GCFR)特有的一种豆科植物,但是鲜为人知。三十年前,该属被描述为容纳错误地放置在灵芝和其他海角豆科属中的物种。虎耳草是南非受威胁第三大的植物属,因此,分类学研究应优先考虑,目前对分布模式的了解对于保护措施至关重要。在本研究开始时,已知有8种,所有这些物种都面临灭绝的威胁。然而,物种边界尚不清楚,许多雷诺斯特维尔德碎片,特别是在奥弗贝格地区,需要进一步探索以寻找各种波利西亚种类。物种之间的亲缘关系和单亲,特别是关于形态异常的P. involucrata的位置,尚未得到测试。这项研究建立在广泛的植物标本室采样和分析的基础上。考虑了形态学,解剖学,孢粉学和分子数据后,我们提出了Polhillia属的最新分类法物种之间的形态特征通常是晦涩难懂的,独特的字符却很少见,因为这种物种是根据独特的字符组合来识别的。花粉和叶片的解剖学研究没有提供实质性的分类学信息,尽管注意到某些种间差异。分子系统发育重建证实Polhillia是单系的,是Argyrolobium的姐妹,而Argyrolobium可能不是单系的。形态学上独特的种,P。involucrata,作为其余属的姐妹得到了大力支持。由于所研究的DNA标记之间的变异性低,许多进化枝中Polhillia的内部系统发育分辨力很弱,并且仍然存在多个多形体。基于形态和分子证据,我们将P. involucrata置于新的单型Roseopolhillia亚属中。描述了四个新物种(P. fortunata B.du Preez,P。groenewaldii B.du Preez,P.stirtonianaB.du Preez,P。xairuensis B.du Preez)和先前公认的物种(P. canescens CHStirt。)被置于P. connata(Harv。)CHStirt的同义词。为所有物种提供了红色数据列表评估,以突出其保护重要性。为每个物种提供了地图和复合色板。

更新日期:2021-01-10
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