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The labels denote the germplasm collection numbers and origin. Suffixes indicate respective species (PAR: P. argyraea, PAU: P. auriculata, PFE: P. fendleri, PGO: P. gordonii, PGF: P. grandiflora, PGR: P. gracilis, PKN: P. ‘kathryn’, PLI: P. lindheimeri, PPL: P. pallida, PRC: P. recurvata, PRT: P. rectipes, and PTH: P. thamnophila).
