Barcoding the Dendrobium (Orchidaceae) Species and Analysis of the Intragenomic Variation Based on the Internal Transcribed Spacer 2

Figure 2

The neighbor-joining tree built using the major variants of ITS2 from 18 Dendrobium species. Note. Each species was marked with a unique color. The three parts of the name of each branch represent the voucher number, the variant name of the multiple copy in the genome, and the percentage of its presence in the genome. The taxa with their voucher numbers were listed for the following: D. williamsonii (PS2503), D. trigonopus (PS2506), D. acinaciforme (PS2527), D. capillipes (PS2502), D. loddigesii (PS1748), D. crystallinum (PS2519), D. denneanum (PS0758), D. chrysotoxum (PS2501), D. officinale (PS2521), D. gratiosissimum (PS2513), D. nobile (PS0766), D. wardianum (PS2509), D. pendulum (PS2511), D. aphyllum (PS2523), D. primulinum (PS2518), D. devonianum (PS2520), D. chrysanthum (PS2515), and D. crepidatum (PS2517).