Echinopsis marsoneri

Echinopsis marsoneri is a species of cactus from Argentina and Bolivia.

Description
Echinopsis marsoneri usually grows singly and has a short beet root. The spherical, light gray-green shoots reach a diameter of 8 cm and grow to the same height. There are about 20 compressed ribs arranged in a spiral pattern. The whitish gray to yellowish thorns arising from the areoles are darker at their base. The two to five protruding, often hooked central spines are thickened at their base and up to 7 cm long. The eight to twelve marginal spines are up to 3 cm long.

The short, funnel-shaped to bell-shaped, yellow, orange or red flowers have a darker throat. They are 5 to 6 cm long and have the same diameter. The egg-shaped fruits are semi-dry to sticky.

Distribution
Echinopsis marsoneri is widespread in the Bolivian department of Chuquisaca and the Argentine provinces of Jujuy and Salta at altitudes of 2500 to 4500 meters.

Taxonomy
The first description by Erich Werdermann was published in 1932. The specific epithet marsoneri honors the Argentine cactus collector Oreste Marsoner. Nomenclature synonyms are Lobivia chrysantha subsp. marsoneri (Werderm.) Rausch (1975), Lobivia chrysantha var. marsoneri (Werderm.) Rausch (1975) and Lobivia chrysantha subsp. marsoneri (Werderm.) Rausch ex G.D. Rowley (1982).