Peniocereus greggii var. greggii (Night-Blooming Cereus)
Root large, fleshy, round at the top, tapering; stems 2 m long, pale gray-green, slender, 1-2.5 cm in diameter, strongly angled by the 4-6 low, broad ribs; areoles narrowly oval about 4 mm long, white to gray woolly, bearing approximately 12 gray to ...