Pennellianthus frutescens (Lamb.) Crosswhite [ Penstemon frutescens Lamb.]
      
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6 762783 Pennellianthus frutescens (Lamb.) Crosswhite [125 763593 Penstemon frutescens Lamb.] Scrophulariaceae
Trans. Linn. Soc. London, vol. 10 : t. 6 (1815) [n.a.]