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  Eriosyce strausiana
(Syn: Pyrrhocactus strausianus)
CACTUSPEDIA       

 


E. strausiana (ex: Pyrrhocactus strausianus R542 Quebrada del Toro - Cacheuta, Mendoza, Argentina )
 

Description: Eriosyce strausiana is a solitary or slowly clumping cactus with very strong spines. Flowers grow up at the top.
Stem: Globose to to sub-globose or cylindrical as it becomes old, up to 20 cm tall and 8-15 cm in width, dark green to olive green.
Roots: Fibrous from a short tap root.
Ribs: 12 to14 in adult specimens. Obtuse and somewhat notched.
Areoles: Oval, woolly and hairy when young (with yellowish felt), later naked.
Radial spines: 8 to 14 about 25-30 mm long, Mostly curved upward, subulate, base swollen, dark greyish-black or dark horn coloured with black tips. Young spines are almost black (with a dark purple base), while older ones turn grayish.
Central spines: 1 to 8 longer and stouter (approx 30-40 mm long) similar in colour and shape to the radials.
Flowers: 3-4 cm long, 3,5-5 cm in diameter. Apical, broad funnel-form, straw coloured to dirty amber-yellow . Pericarpel and floral tube with wool and bristles.
Fruits: Only about 7-10 mm long, egg-shaped, greenish with thin wall, opening at maturity from a basal pore.

Recognized subspecies, varieties and forms:

Eriosyce strausiana: 20 cm tall and 8-15 cm in diameter with 6-8 central spines, flowers 4 cm in diameter. Origin: San JosÚ de Jachal
Eriosyce strausiana var. pachoensis: 10 cm tall and 8 cm in diameter 1-2 central spines, flowers 3,5 cm in diameter. Origin: Pachaco.
 

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Cultivation:
 
 This slow growing cactus is kept for the beauty of its form and flowers. It is a summer grower species. Easy to cultivate but 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, but
must be protected from excessive heat and sun in summer, and seems to do best in cultivation with a bit of shade.  Good heat tolerance. Keep warm and dry in winter (5 to10░C) to avoid rot.  Not highly tolerant of a great deal of frost. (Frost tolerance -5░C or less for shot periods)

Propagation: Usually propagated from Seeds. (seldom produces offsets)
Grafting is
sometime used to speed growth rate and to create a back-up to plants in collection.


Photo of conspecific taxa, varieties, forms and cultivars of
plants belonging to the Eriosyce straussiana
complex  (This taxon has lots of synonyms (like most Eriosyce) whit several controversial varieties and subspecies):

Family: Cactaceae (Cactus Family)

Scientific Name: Eriosyce strausiana  (K.Schum.) Kattermann
In: Eriosyce (Cactaceae): The genus revised and amplified 1: 117, 1994

OriginLa Pampa, San Juan and Mendoza, Argentina, South America.

Conservation status: Listed in CITES Appendix II

Synonyms:
  • Echinocactus strausianus  K.Schum. 1901
  • Pyrrhocactus strausianus  (K.Schum.) A.Berger 1929
  • Neoporteria strausiana  (K.Schum.) Donald & G.D.Rowley 1966

Heterotypic synonyms:

  • Echinocactus catamarcensis Spegazzini 1905
  • Malacocarpus catamarcensis (Spegazzini) Britton & Rose 1922
  • Pyrrhocactus catamarcensis (Spegazzini) F. Ritter 1959
  • Neoporteria catamarcensis
  • Cereus catamarcensis
  • Echinopsis catamarcensis
  • Echinocactus sanjuanensis Spegazzini 1905
  • Pyrrhocactus sanjuanensis (Spegazzini) Backeberg 1939
  • Neoporteria sanjuanensis (Spegazzini) Donald & G. D. Rowley 1966
  • Malacocarpus sanjuanensis
  • Pyrrhocactus strausianus var. sanjuanensis
  • Pyrrhocactus vollianus Backeberg 1957
  • Neoporteria volliana (Backeberg) Donald & G. D. Rowley 1966 Pyrrhocactus pachacoensis Rausch 1975
  • Eriosyce strausiana var. pachacoensis (Rausch) Kattermann 1994 Pyrrhocactus platyacanthus F. Ritter 1980
  • Pyrrhocactus setiflorus,
  • Neoporteria setiflora,
  • Pyrrhocactus atrospinosus,
  • Neoporteria backebergii

Etymology: Named after Mr. L. Straus (1862-1934), German merchant and cactus hobbyist in Bruchsal near Baden and co-founder of the Deutsche Kakteen-Gesellschaft DKG.
 

 


 

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