less common spelling of penstemon
: any of a genus (Penstemon) of perennial, chiefly North American herbs or low shrubs of the snapdragon family typically with spikes of showy, two-lipped, tubular flowers with two lobes on the upper lip and three lobes on the lower lip : beardtongue In the pastel planting, pink penstemons with upright spikes of tubular flowers contrast with such mounding plants as pinks … — Lynn Ocone
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