Botanical name: Cereus pterogonus Family: Cactaceae (Cactus family)
Columnar Cactus is a shrub with branchless stems, 3-9-winged or angled; wings up to 4 cm wide; areoles echinate, without glochids, woolly; spines about 15, unequal, to 3 cm. Leaves are absent. Flowers are lateral, stalkless, up to 15 cm wide. Perianth tube round at base, to 10 cm, funnel-shaped with a few scales below. Tepals are numerous; outer ones greenish-white; inner ones white, oblong, lanceshaped, to 7 x 1.5 cm. Stamens numerous, inserted at various levels on the perianth; filaments slender; anthers oblong, to 2.5 mm. Ovary subround-angular, 2.5-3 cm long, 1 cm broad, with scales and areoles; ovules numerous, on several parietal placentae; style to 10 cm; stigmatic lobes 10-15, to 1 cm. Columnar Cactus is native to Tropical America, cultivated widely.
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The flower labeled Columnar Cactus is ...