|Ferocactus emoryi ssp. rectispinus at the botanical garden of Villa Durazzo-Pallavicini, Genova Pegli|
Ferocactus emoryi is spherical or cylindrical solitary barrel cactus, light green to glaucous, reaching a diameter of 60–100 centimetres (24–39 in) and a height of 2–2.5 metres (6 ft 7 in–8 ft 2 in). It has 15 to 30 ribs with tubercles, especially in the juvenile stage. The spines are white to reddish. The central spine is very strong, 4–10 cm long, while the seven to twelve radial spines reach lengths of up to 6 cm. The large and funnel-shaped flowers are usually red or yellow, reach lengths of up to 7.5 centimeters and have a diameter of 5 to 7 centimeters. The fruit is ovoidal, about 5 cm long.
Ferocactus emoryi grows in the desert scrubs, hillsides, rocky slopes and gravely rocky or sandy soils, at an elevation of about 0–1,200 metres (0–3,937 ft) above sea level.
- Ferocactus emoryi var. emoryi
- Ferocactus emoryi var. rectispinus (Engelm.) N.P.Taylor
- Flora of North America Editorial Committee, e. 2003. Magnoliophyta: Caryophyllidae, part 1. In Fl. N. Amer.. Oxford University Press, New York.
- Tropicos: Ferocactus emoryi
- Cactiguide: Ferocactus emoryi
- The Plant List.org: Ferocactus emoryi
- Desert Tropicals: Ferocactus emoryi
- Cactus-art.biz: Ferocactus emoryi
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