Echinopsis arachnacantha
Echinopsis arachnacantha, synonym Lobivia arachnacantha, is a species of cactus in the genus Echinopsis, native to Bolivia.
Description
Echinopsis arachnacantha typically grows in clusters with flattened to spherical stems that are dark green and feature around 14 weakly notched ribs. The areoles on these stems bear 9-15 radial spines measuring 5 mm in length, which can range from pale to dark brown or yellowish-brown, sometimes accompanied by a 1.5 mm long black spine. Its flowers are approximately 5 cm wide and are supported by a slender floral tube that is about 5 cm long.Taxonomy
The species was first described in 1956 as Lobivia arachnacantha.Subspecies
, Plants of the World Online accepted the following subspecies:| Image | Subspecies | Distribution |
| Echinopsis arachnacantha var. arachnacantha | Bolivia | |
| Echinopsis arachnacantha var. densiseta Rausch | Bolivia | |
| Echinopsis arachnacantha var. sulphurea R.Vásquez | Bolivia | |
| Echinopsis arachnacantha var. torrecillasensis Buining | Bolivia |