Islaya islayensis lindleyi "paucispina" (paucispina) KK348 Chala, Peru Altitude: 100-200m
This form has stronger spines.
 

Description: E. islayensis is a small globose to cylindrical cactus with very woolly areoles and dark spreading spines, it is indeed very variable and has received many names, but it is clear from fieldworks that the different wild populations constitute a single but multiform species. The var. lindleyi has fewer spines,  the var. lindleyi "paucispina"  is very similar to lindleyi (if not the same) but usually has stronger spines.
Stems: Grey-green, 5 to 40 cm tall (or more long), 5 to 20 cm in diameter.
Ribs: 19 to 25 low and obtuse.
Areoles: Approximate, very woolly, with grey-brown felt
Roots: Fibrous.
Spines: Variable in colour, horn-coloured, brow to shiny black, turning grey as they age.
Central spines: 4 to 7 spreading, thick, 12-16 mm long.
Radial spines: 12 to 22, shorter, radiating, (1-)6-10 mm long.
Flowers: Diurnal, 1,5 - 4 cm long and in diameter, born on younger areoles from a yellowish woolly crown in summer,  wide funnelform, yellow, outer perianth segments often reddish, floral tube short with tufts of dense wool and long reddish bristles.
Fruits: Characteristic, up to 5 cm long, club shaped, balloon-like, pinkish to red, openings at maturity by basal pores. Pericarp initially fleshy but the interior always dry when mature.
Seeds: Broadly oval.
 

Scientific Name: Islaya islayensis var. lindleyi

Nowadays regarded as: Eriosyce islayensis (Foster) Katt. 1994

Origin: E. islayensis is endemic to the northern Chile along the coast, to southern Peru (just south of Lima). Type locality Province of Islay Peru.

Habitat: Grows in very dry desert areas where it almost never rains and where only the occasional sea fog drift inland.

Etymology: The genus name "islayensis" derives for the occurrence in the Province of Islay, Department Arequipa, Peru. The variety name "lindley" comes from the English botanist John Lindley (February 8, 1799 - November 1, 1865).

Conservation status: Listed in CITES appendix 2.

Synonyms:  

• Islaya lindleyi "paucispina"
• Echinocactus islayensis C.F.Först. 1861
  In: Hamb. Gartenz. 17:160. 1861 (Basyonym)
• Islaya islayensis (Först) Backeberg 1934
• Neoporteria islayensis (C.F.Först.) Donald & G.D.Rowley 1966
• Neoporteria lindleyi (Foerst.) Don. & Rowley
• Echinocactus lindleyi
• Neoporteria lindleyi v. curvispina
• Islaya paucispina

Cultivation:  It is a summer grower species that, like many cacti of the Peruvian deserts, present some problems in cultivation. It is in fact somewhat rot prone if kept in a non ventilated place. Require a very fast draining drying soil, water regularly in summer, but do not overwater.
Needs a full sun exposure (or light shade)  Good heat tolerance. Hardy to at least -5°C ( but probably can tolerate - 10° C for brief periods)
Mature plants imported from the native habitats usually did not take roots.

Propagation: Usually propagated from Seeds. (seldom produces offsets) or by grafting onto a strong grafting stock like Selenicereus sp. Such grafted seedlings can be been successfully cultivated for years.
 

Photo of conspecific taxa, varieties, forms and cultivars of plants belonging to the Eriosyce (Islaya) islayensis complex (This Taxon has lots of synonyms whit several controversial varieties and subspecies and comprises a multitude of different forms, but where each form is linked to others by populations of plants with intermediate characteristics):

• Islaya copiapoides (Eriosyce islayensis)
• Islaya grandiflorens f. spinosior (Eriosyce islayensis)
• Islaya lindleyi (Eriosyce islayensis)
• Islaya lindleyi "paucispina" (Eriosyce islayensis)