基于分子与形态证据的桃色无心菜(石竹科)分类地位探讨

广义无心菜属(Arenaria L.s.l.)是石竹科(Caryophyllaceae)中分类较为困难的大属之一,基于分子系统学研究结果该属目前已被拆分为多属.基于形态学证据,桃色无心菜(Arenaria melandryoides Edgew.)被置于无心菜属齿瓣亚属[subg.Odontostemma(G.Don)...

Taxonomic Investigation of Arenaria melandryoides (Caryophyllaceae):Insights from Molecular and Morphological Data

Arenaria L. s.l. is one of the taxonomically difficult large genera in Caryophyllaceae, it was recircumscribed recently and some other genera were segregated from it based on molecular phylogenetic results. Based on morphological evidence, the species Arenaria melandryoides Edgew. was placed previously within A. subgenus Odontostemma (G. Don) Williams or recently within the genera Odontostemma Benth. ex G. Don and Shivparvatia (Edgew.) Pusalkar & D. K. Singh, however the species has never been included in molecular phylogenetic study. The phylogeny of Alsineae using the nuclear ribosomal internal transcribed spacer (nrITS) sequence was reconstructed. The result showed that the monophyly of the genus Odontostemma circumscribed recently was rejected and A. melandryoides was nested deeply within Shivparvatia, thus the specific name S. melandryoides (Edgew.) Satish Chandra and D. S. Rawat should be accepted. Additionally, the transfer of A. saginoides Maxim., A. spathulifolia C. Y. Wu ex L. H. Zhou and A. yunnanensis Franch. to the genus Odontostemma and A. rhodantha Pax & K. Hoffmann to Shivparvatia were all supported here for the first time in molecular phylogenetic analyses. Morphologically, the solitary flower at the top of stem might be a good diagnostic character to distinguish the genus Shivparvatia from Odontostemma.