Matucana madisoniorum

Matucana madisoniorum usually grows solitarily and only rarely sprouts with flattened, spherical to broadly columnar, cloudy grey-green shoots and reaches a height of up to 15 cm (5.9 in) with a diameter of 10 cm (3.9 in). There are seven to twelve flat and broad transversely furrowed ribs. They have up to five blackish-brown, curved, flexible and slightly falling spines, which can also be absent, turn gray with age, up to 3 cm (1.2 in) long.

The narrow, funnel-shaped, slightly crooked, orange-red flowers are 8 to 10 cm (3.1 to 3.9 in) long and have a diameter of 4 to 5.5 cm (1.6 to 2.2 in). The spherical, hairy fruits reach a diameter of up to 2 cm (0.79 in).^[3]

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  Adult plant
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  Blooming size plant
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  crown closeup
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  Flower closeup
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  White-flowered form

Matucana madisoniorum is found in the Peruvian Amazonas Department northeast of the city of Bagua in the valley of the Río Marañón at altitudes of 400 to 1000 meters.