Next the three petals ( the corolla ) form a tube about 8.5 cm long , terminating in three petal lobes : an upright central lobe and two slightly shorter side lobes .
Next the three petals ( the corolla ) form a tube about 1.6 -- 3 cm long , almost entirely hidden within the calyx . 
 The tube terminates in three petal lobes : an upright central lobe and two slightly shorter side lobes .