Hecastocleis is a genus of plants in the daisy family containing the single species Hecastocleis shockleyi. It is known by the common name prickleleaf. This plant is native to the desert mountains and plains of eastern California (Inyo, Mono, Kern, + San Bernardino Counties) and southern Nevada (Mineral, Esmeralda, Nye, Lincoln, + Clark Counties), where it grows on arid, rocky slopes and flats.