Stock photography, photos: Purple Penstemon Stock photos of Purple Penstemon Photograph: © Warren Agee Click for a larger image and more information Keywords associated with this stock photo: bloom, botanic, blossom, flora, flower, garden, horticulture, penstemon, purple, beard tongue, scrophulariaceae, perennial, summer, dry, arid, xeriscape, california, western native, warren agee, dsc3152