penstemon serrulatus(n = noun.plant) cascade penstemon - whorls of deep blue to dark purple flowers at tips of erect leafy stems; moist places from British Columbia to Oregon;
is a kind of wild flower, wildflower
is a member of genus penstemon, penstemon

cascade penstemon, cliff penstemon, davidson's penstemon, genus penstemon, golden-beard penstemon, hot-rock penstemon, jones' penstemon, lowbush penstemon, narrow-leaf penstemon, parry's penstemon, penstemon, penstemon barbatus, penstemon centranthifolius, penstemon cyananthus, penstemon davidsonii, penstemon deustus, penstemon dolius, penstemon fruticosus, penstemon linarioides, penstemon newberryi, penstemon palmeri, penstemon parryi, penstemon rupicola, penstemon rydbergii, penstemon whippleanus, platte river penstemon, red shrubby penstemon, redwood penstemon, rock penstemon, rydberg's penstemon, scented penstemon, shrubby penstemon, whipple's penstemon