Abstract
Eutremananum, a new high-elevation (4500–4600 m) species from Chola Shan, Sichuan (Southwest China), is described and illustrated. It is similar morphologically to E.nepalense but is readily distinguished by having oblong to elliptic or obovate to spatulate (vs. suborbicular to broadly ovate) leaves, glabrous (vs. puberulent) sepals and ovate to oblong fruit 4–7 × 2–3 mm with flattened valves (vs. ovoid to subglobose fruit 2–3 × 1.8–2 mm with rounded valves). The genetic differences amongst E.nanum, E.nepalense and other close relatives are further confirmed by phylogenetic analyses using ITS and cpDNA sequence variations. The new combination E.sinense is proposed.
Highlights
The boundaries of Eutrema R.Br. (Brassicaceae or Cruciferae) have recently been expanded to include 38 species, several of which were previously placed in the six genera Taphrospermum C.A.Mey., Thellungiella O.E.Schulz, Neomartinella Pilg., Platycraspedum O.E.Schulz, Chalcanthus Boiss. and Pegaeophyton Hayek & Hand.Mazz. (Al-Shehbaz and Warwick 2005; Hao et al 2017a)
We examined morphological traits of Eutrema nanum and several relative species
Based on sequence variations of internal transcribed spacer (ITS) and chloroplast DNA (cpDNA) (Table 3), phylogenetic analyses suggested that Eutrema nanum is mostly related to E. nepalense, E. sinense and E. scapiflorum
Summary
The boundaries of Eutrema R.Br. (Brassicaceae or Cruciferae) have recently been expanded to include 38 species, several of which were previously placed in the six genera Taphrospermum C.A.Mey., Thellungiella O.E.Schulz, Neomartinella Pilg., Platycraspedum O.E.Schulz, Chalcanthus Boiss. and Pegaeophyton Hayek & Hand.Mazz. (Al-Shehbaz and Warwick 2005; Hao et al 2017a). We reported two new species during recent field investigations and molecular analyses (Hao et al 2016, 2017b). We report the third one, Eutrema nanum, found in Chola Shan at a high elevation of 4500–4600 m in Sichuan Province, Southwest China. This new species is morphlogically similar to E. nepalense (Al-Shehbaz, Kats Arai & H.Ohba) Al-Shehbaz, G.Q.Hao & J.Quan Liu but, as shown below, it is readily distinguished by several aspects of leaves and fruit. One of six species which were used to determine the systematic position of E. nanum was found to need a taxonomic combination and a new name Eutrema sinense (Hemsl.) G.Q.Hao, J.Quan Liu & AlShehbaz is proposed
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