Figure 2.1–Shoots of Arceuthobium. A: young shoots showing the decussate arrangement of the internodes; B: older shoots showing elongated internodes and branching; C: typical flabellate (fan-like) branching pattern of most New World species; D: verticillate (whorled) branching pattern of Old World and a few New World species. All species show the primary branching type (A and B), but most species also develop secondary branching, which may be either flabellate (C) or verticillate (D).