Lobivia arachnacantha

Lobivia arachnacantha is a species of cactus in the genus Lobivia, native to Bolivia.^[1][2]

Lobivia arachnacantha
Echinopsis arachnacantha subsp. arachnacantha
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Order:	Caryophyllales
Family:	Cactaceae
Subfamily:	Cactoideae
Genus:	Lobivia
Species:	L. arachnacantha
Binomial name
Lobivia arachnacantha Buining & F.Ritter
Synonyms[1]
List Echinopsis arachnacantha (Buining & F.Ritter) Friedrich Echinopsis ancistrophora subsp. arachnacantha (Buining & F.Ritter) Rausch Echinopsis ancistrophora var. kratochviliana (Backeb.) Rausch Echinopsis arachnacantha var. densiseta Friedrich Echinopsis arachnacantha var. sulphurea (R.Vásquez) G.D.Rowley Echinopsis arachnacantha var. torrecillasensis (Cárdenas) Friedrich Echinopsis arachnacantha var. vallegrandensis Rausch Echinopsis graciliflora Cárdenas Echinopsis kratochviliana Backeb. Echinopsis torrecillasensis Cárdenas Neolobivia kratochviliana (Backeb.) Y.Itô Pseudolobivia kratochviliana (Backeb.) Backeb. Pseudolobivia torrecillasensis (Cárdenas) Backeb.

Description

Lobivia 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.^[3]

• 
  Lobivia arachnacantha typically forms clumps
• 
  Lobivia arachnacantha

Subspecies

The following varieties are accepted:^[1]

Image	Subspecies	Distribution
	Lobivia arachnacantha var. arachnacantha	Bolivia
	Lobivia arachnacantha var. densiseta Rausch	Bolivia
	Lobivia arachnacantha var. sulphurea R.Vásquez	Bolivia
	Lobivia arachnacantha var. torrecillasensis (Cárdenas) Buining	Bolivia

Distribution

Plants are found in Bolivia, in the departments of Santa Cruz, Chuquisaca, and Cochabamba, as well as in Salta, Argentina. It grows at elevations between 1800 and 2600 meters. This species grows on stony hills in places with reliable summer rainfall.^[3]

Taxonomy

As its synonym Echinopsis arachnacantha it has gained the Royal Horticultural Society's Award of Garden Merit.^[4]