| Matucana ritteri | |
|---|---|
|   | |
|  Scientific classification   | |
| Kingdom: | Plantae | 
| Clade: | Tracheophytes | 
| Clade: | Angiosperms | 
| Clade: | Eudicots | 
| Order: | Caryophyllales | 
| Family: | Cactaceae | 
| Subfamily: | Cactoideae | 
| Genus: | Matucana | 
| Species: | M. ritteri  | 
| Binomial name | |
| Matucana ritteri  Buining 1959  | |
Matucana ritteri is a species of Matucana found in Peru.
Matucana ritteri usually grows solitary with flattened spherical, glossy dark green shoots and reaches a height of 3 to 5 cm (1.2 to 2.0 in) with a diameter of 5 to 10 cm (2.0 to 3.9 in). There are twelve to 22 blunt ribs present. The straight to slightly curved brownish-black spines turn gray with age. The one to five central spines are 2 to 4 cm (0.79 to 1.57 in), the seven to 14 radial spines 1 to 3 cm (0.39 to 1.18 in) long.
The crooked, crimson flowers are 7 to 9 cm (2.8 to 3.5 in) long and have a diameter of 4.5 to 5 cm (1.8 to 2.0 in). The bright red and green, scaly fruits reach a diameter of 1 to 1.5 cm (0.39 to 0.59 in). [2]
Matucana ritteri is common in the region of La Libertad in Peru, near Otuzco at altitudes of 2500 meters.
The first description was in 1959 by Albert Frederik Hendrik Buining. [3] The specific epithet ritteri honors the German cacti specialist Friedrich Ritter. Nomenclature synonyms are Submatucana ritteri (Buining) Backeb. (1962) and Borzicactus ritteri (Buining) Donald (1971).
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