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Description: Leuchtenbergia principis is the sole species of the genus Leuchtenbergia, it is a unique looking cactus with very long tubercles, making the plant resemble an agave. It is slow-growing but can eventually grow up to 70 cm high.
Root: It has a large, tuberous taproot.
Stem: Solitary or slowly offsetting, cylindrical which becomes bare and corky at the base with age, forming a 7.5 cm thick trunk.
Tubercles: Long, slender, grayish-green to bluish-green, triangular in cross-section, resembling triangular agave-like leaves with the tips cut off, 6-15 cm long, with purplish-red blotches at their tips. Old, basal tubercles dry up and fall off.
Areole: At the tip of the tubercle with grey wool.
Spines: The tubercles are topped with papery, flexible spines; central spines 1-2, up to 20 (or more)cm long; radials 8 to 14, up to 5(-10) cm long.
Flowers: From the areole at the tip of the new tubercles on mature plant (at least 4-5 years old)large, funnel-shaped, fragrant, yellow, 5-10 cm wide.
Fruit: Green to violet, 3 cm long and 2 cm broad, more or less glaucous, smooth. When ripe the bottom of the fruit open and release several hundred large seeds.
Blooming season: Leuchtenbergia (like the Astrophytums) flowers intermittently throughout the warm months from spring to autumn.