Origin and Habitat: Echinopsis obrepandaSN|21037]]SN|21037]] subs. calorubra is endemic to Bolivia, where it occurs in Cochabamba between Comarapa and San Isidro.
Altitude range: This species grows at elevations of 2,400 to 3,000 metres above sea level.
Habitat and Ecology: The species grows in prepuna and high altitude grasslands. The species is locally abundant, and seed recruitment seems to be high. The population trend is stable. The main threats are agriculture and urbanization, specifically the expansion of Cochabamba city.

• Echinopsis obrepanda subs. calorubra (Cárdenas) G.Navarro
• Echinopsis calorubra Cárdenas
• Echinopsis obrepanda var. calorubra (Cárdenas) Rausch
• Lobivia calorubra (Cárdenas) Rausch
• Pseudolobivia calorubra (Cárdenas) Backeb.

• Echinopsis obrepanda (Salm-Dyck) K.Schum.
• Echinocactus obrepandus Salm-Dyck
• Pseudolobivia fiebrigii (Gürke) Backeb. ex Krainz
• Pseudolobivia obrepanda (Salm-Dyck) Backeb. ex Krainz
• Echinopsis carmineiflora (Werner Hoffm. & Backeb.) H.Friedrich
• Pseudolobivia carmineiflora Werner Hoffm. & Backeb.
• Echinopsis cristata Salm-Dyck
• Echinopsis cristata var. purpurea Hook.
• Echinopsis misleyi Labour.
• Echinocactus misleyi
• Echinopsis obrepanda var. aguilarii (R.Vásquez) Rausch
• Lobivia aguilarii R.Vásquez
• Echinopsis obrepanda var. fiebrigii (Gürke) Friedrich
• Echinopsis fiebrigii Gürke
• Pseudolobivia obrepanda var. fiebrigii (Gürke) Backeb.
• Echinopsis obrepanda var. mizquensis (Rausch) Rausch
• Lobivia calorubra var. mizquensis (Rausch) Rausch
• Lobivia mizquensis var. Rausch Rausch
• Echinopsis obrepanda var. purpurea hort.
• Lobivia obrepanda var. purpurea hort.
• Echinopsis rauschii Friedrich
• Echinopsis rojasii Cárdenas
• Pseudolobivia rojasii (Cárdenas) Backeb.
• Echinopsis rojasii var. albiflora Cárdenas
• Pseudolobivia rojasii var. albiflora (Cárdenas) Backeb.
• Echinopsis toralapana Cárdenas
• Pseudolobivia toralapana (Cárdenas) Backeb.

• Echinopsis obrepanda subs. calorubra (Cárdenas) G.Navarro
• Echinopsis calorubra Cárdenas
• Echinopsis obrepanda var. calorubra (Cárdenas) Rausch
• Lobivia calorubra (Cárdenas) Rausch
• Pseudolobivia calorubra (Cárdenas) Backeb.

• Echinopsis obrepanda subs. tapecuana (F.Ritter) G.Navarro
• Echinopsis tapecuana F.Ritter

Description: Echinopsis obrepandaSN|21206]]SN|21037]] subs. calorubra (firstly described as Echinopsis calorubraSN|21042]]SN|21048]] by Cárdenas in 1957) is a distinct subspecies of the widespread and variable Echinopsis obrepandaSN|21064]]SN|21037]]. It has a single central spine to 2.5 cm long, 9-13 radials, and very showy orange-red to dark red flowers up to 15 cm long.
Stem: Up to 6-7 tall and 14 cm across.
Ribs: 16.
Central spine: 1, up to 2.5 cm.
Radial spines: 9-13, somewhat curved.
Flowers: Up to 15cm inner segments orange-red above, bluish pink towards base.
Taxonomic note. The taxonomic boundaries of this species are still object of debate, some authors think that Echinopsis calorubraSN|21048]]SN|21048]] should be placed under the name Echinopsis rauschiiSN|21037]]SN|21064]] H.Friedrich, and should include Echinopsis rojasiiSN|21048]]SN|21042]] Cárdenas. According to Hunt et al. (2006) the concept of E. calorubra also includes Echinopsis cardenasianaSN|21037]]SN|21206]] (Rausch) H.Friedrich.

Bibliography: Major references and further lectures
1) Hunt, D., Taylor, N. and Charles, G. (compilers and editors). “The New Cactus Lexicon.” dh Books, Milborne Port, UK. 2006
2) James Cullen, Sabina G. Knees, H. Suzanne Cubey "The European Garden Flora Flowering Plants: A Manual for the Identification of Plants Cultivated in Europe, Both Out-of-Doors and Under Glass" Cambridge University Press, 11/Aug/2011
3) Lowry, M. & Carr, J. 2013. Echinopsis calorubra. The IUCN Red List of Threatened Species 2013: e.T152067A593537. http://dx.doi.org/10.2305/IUCN.UK.2013-1.RLTS.T152067A593537.en. Downloaded on 19 October 2016.
4) Edward Anderson “The Cactus family” Timber Press, Incorporated, 2001

Cultivation and Propagation: The Red Easter Lily Cactus is a summer grower species that offers no cultivation difficulties. Water regularly in summer (but do not overwater ) needs good drainage and very porous soil, keep rather dry in winter. Feed with a high potassium fertilizer in summer. It is quite frost resistant if kept dry (hardy to -7° C). Need a bright exposure, full sun or half shade in summer.
Propagation: Direct sow after last frost, offsets.