Generic affiliation of Phyllagathis phamhoangii (Melastomataceae) from Vietnam
Generic affiliation of Phyllagathis phamhoangii (Melastomataceae) from Vietnam
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越南 Phyllagathis phamhoangii（野牡丹科）的总属关系
DOI：
10.11646/phytotaxa.470.3.1
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发表时间：
2020-11-05
期刊：
影响因子：
1.1
通讯作者：
Liu, Ying
中科院分区：
文献类型：
--
作者：
Dai, Jin-Hong;Zhuang, Qi-Yuan;Liu, Ying
Phyllagathis phhamhoangii是越南的一种，由于其习性、根茎形态和叶形与P. nanakorniana和P. subrotunda相似，最初被描述为Phyllagathis。然而，其整体形态，主要是雄蕊和蒴果形态，更符合福特叶植物，表明可疑的属属关系。我们结合分子（nrITS）和解剖（晶体形式）证据来确定phamhoangii的属缘关系。我们的系统发育分析在fordiophyth中发现了P. phhamhoangii，在Kerriothyrsus分支中发现了P. nanakorniana和P. subrotunda。福特植物分支的特征是存在棘皮，而Kerriothyrsus分支的特征是存在棘皮。基于这些证据，phamhoangii被转移到福特植物中，形成一个新的组合F. phamhoangii。它在形态上与花椒相似，但在叶片上与后者不同，先端短渐尖至渐尖（相对于宽锐尖），托杯4脊（相对于无脊），短雄蕊的连接花序背刺（相对于无刺）。
Phyllagathis phamhoangii, a species from Vietnam, was originally described in Phyllagathis based on its resemblance to P. nanakorniana and P. subrotunda in habit, rhizome morphology and leaf shape. However, its overall morphology, mainly stamen and capsule morphology, corresponds better with Fordiophyton indicating questionable generic affiliation. We included molecular (nrITS) and anatomical (crystal form) evidences to resolve the generic affiliation of P. phamhoangii. Our phylogenetic analyses recovered P. phamhoangii inside Fordiophyton and P. nanakorniana and P. subrotunda inside the Kerriothyrsus clade. The Fordiophyton clade is characterized by the presence of raphides, while the Kerriothyrsus clade is characterized by druses. Based on these evidences, P. phamhoangii is herein transferred to Fordiophyton, resulting in a new combination F. phamhoangii. It is morphologically similar to F. peperomiifolium but differs from the latter in the leaf blade with shortly acuminate to acuminate apex (vs. broadly acute), hypanthium 4-ridged (vs. not ridged), and connectives of shorter stamens dorsally spurred (vs. not spurred).