Soehrensia hahniana

Soehrensia hahniana is a species of Soehrensia found in Paraguay.

Description
Soehrensia hahniana grows creeping, prostrate or hanging, laterally branching shoots. The spherical to cylindrical, light green to dark-green shoots reach heights of growth of up to 1 meters with a diameter of 1.5-3.0 cm. There are 8 low ribs that are notched and tuberous with areoles at the edge. The areoles have 8-14 whitish yellow to light brown spines. The 1-3 central spines are 0.5 to 0.8 cm long. The radial spines are 0.5 cm long. The broad, funnel-shaped woolly bud with creamy white flowers appear near the top of the shoot and are open during the day. They are 15.5 to 17 cm long and have the 11.5-12 cm diameter. The ovoid shiny green fruits are 32 mm long and 23 cm in diameter covered with scales. The plant has black brown seeds.

Distribution
Plants are found growing in the shade in dry woodland forest in alkaline clay soil in Rio Apa, Presidente Hayes Department, Paraguay at elevations of 200 to 500 meters.

Taxonomy
This species was first described by Curt Backeberg as Mediocactus hahnianus in 1957 based on a plant found in Hahn's nursery. The plant was rediscovered in the Chaco Basin, Paraguay in 2009 by Lidia Pérez de Molas. Boris O. Schlumpberger placed the species in the genus Soehrensia in 2012.