Plants erect, normally with few-many, closely parallel branches forming a narrow crown. Stems light to deep green, or blue-green especially when young; ribs 9-13; areoles copiously hairy; hairs deciduous to persistent, long or short. Spines 9-31 per areole; longest spines 10 mm. Flowers campanulate, 5-6 cm; outer tepals light green with brownish midstripes , ovate to obovate, apex acute to obtuse; inner tepals white; outermost ovate to elliptic, innermost oblanceolate to broadly linear. Fruits sometimes with 1-2 scales. Seeds 2 mm.
|Key tree cactus|