design: The total DNA was isolated from leaf materials of the voucher specimen using the plant genomic DNA extraction kit (Solarbio LIFE SCIENCES, China). The DNA concentration and quality were then measured by NanoDrop2000c micro-uv spectrophotometer (Thermo Scientific, America). The DNA was sequenced at Novogene Biotech Co. (Beijing, China) using the Illumina NovaSeq 6000 platform with a 150-bp shotgun library.