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  Eriosyce islayensis grandiflorens f. spinosior
(Syn: Eriosyce islayensis)
CACTUSPEDIA       

 


E. islayensis KK 682 Chala, Peru 200m
(ex: Islaya grandiflorens f. spinosior) 
 

Description: E. islayensis is a small globose to cylindrical cactus with very woolly areoles end 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.
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.
 


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 gallery: Alphabetical listing of Cactus and Succulent pictures published in this site.

Photo gallery ERIOSYCE

Family: Cactaceae (Cactus Family)

Scientific Name: Eriosyce islayensis grandiflorens f. spinosior

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

Origin: 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: For the occurrence in the Province of Islay, Department Arequipa, Peru.

Conservation status: Listed in CITES appendix 2.

Synonyms:  
  • 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
Heterotypic synonyms:
  • Echinocactus molendensis Vaupel
    In: Bot. Jahrb. Engler 50: Beibl. 111:24. 1913
  • Islaya molendensis (Vaupel) Backeberg 1935
  • Islaya minor Backeberg 1934
  • Islaya bicolor Akers & Buining 1951
  • Neoporteria bicolor ( Akers & Buining) Donald & G.D. Rowley 1966
  • Islaya brevicylindrica Rauh & Backeberg 1957
  • Islaya grandiflorens Rauh & Backeberg 1957
  • Islaya copiapoides Rauh & Backeberg 1957
  • Islaya grandis Rauh & Backeberg 1957
  • Islaya paucispinosa Rauh & Backeberg 1957
  • Islaya paucispina Rauh & Backeberg 1957
  • Islaya krainziana F. Ritter 1963
  • Neoporteria krainziana (F. Ritter) Donald & G.D. Rowley 1966
  • Islaya divaricatiflora F. Ritter 1964
  • Islaya flavida F. Ritter 1981
  • Islaya maritima F. Ritter 1981
  • Islaya minuscula F. Ritter 1981
  • Islaya unguispina F. Ritter 1981
 

 


Flowers are pure yellow whit a very woolly tube.

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):



 

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This old page has been moved! Click the link next on the right to enter the new Enciclopedia of Cacti. We hope you find this new site informative and useful.

The Encyclopedia of Cacti