Pittocaulon bombycophole (Bullock) H. Rob. & Brettell Pittocaulon bombycophole (Bullock) H. Rob. & Brettell, Phytologia. 26(6). 1973 sec. Villaseñor & al. 2005=Senecio bombycopholis Bullock in Hooker's Icon. Pl. 34: t. 3343. 1937 syn. sec. Villaseñor & al. 2005