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Key to Pilosocereus

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1 Flowering areoles both tomentose (with tomentose hairs < 5 mm long) and silky with the silken hairs > 8 mm long, these ca. 25-37 µm wide, visibly conspicuous and exserted, dense, and generally parallel and straight to slightly curved; spines to 7 cm long
1 Flowering areoles only tomentose, with tomentose hairs < 5 mm long, these ca. 62-74 µm wide, visibly inconspicuous, and densely matted, intertwined, bent, curled, and irregular; spines to 3 cm long.