Flower to nearly 5 inches (12.5 cm) across. Inner petals acuminate, margins entire, usually reddish-orange with lighter basal stripe. Throat-circle and throat green. Filaments orange, those of inner stamens deep in throat dark reddish; outer stamens in a wide circle. Stigma and style dark green. Stem semicolumnar, to 3 inches (7.5 cm) in diameter; central spines black aging gray, curved, to 1⅜ inches (35 mm) long. ISI 2002-42; HBG 87018, Schick 1677-18.