Sclerocactus spinosior
ssp. blainei  "schleseri"

Sclerocactus spinosior ssp. blainei "schleseri"
SB1540 from Nye County, Nevada, USA. 
This plant is one of the most beautiful in the genus it has wonderful spines: pubescent in young specimens, papery and somewhat flattened when adult.
 

Etymology: The genus name "Sclerocactus" derives from the Greek word “sclero”   meaning "hard ", "cruel”. and the word “cactus” (an old genus name)
The species name "spinosior" derives from the Latin adjectives “spinosus” (“thorny”)  and the comparative suffix “ior” that means “more so, to a greater degree; more-, -er” ( =“the thornier”).
The subspecies name "blainei" is named in honour of Blaine.

New spines

Morphology (Identifying Characteristics):
Habit: Ovoidal and generally solitary.
Stem: 3-15 cm tall.
Spines: Spines are pubescent in young and early reproductive plants; The central spine number varies, and the number of hooked spines may number as many as six, with one central more developed,  they are papery sometimes flattened,  longer and denser than in S. spinosior.
Flower:   Pink-purplish borne at the apex of the stem, blooming in late-spring (May-June).
(In cultivation  in April )

Note:  Red flowers are common in species pollinated by birds (but also bat and insect)

Cultivation: This plant is very rare in cultivation, it is difficult to grow on its own roots and to propagate. Mature individuals easily rot and die especially after planting. The seeds germinate with extreme difficulty and a low rate of success, seedlings do not do well either, and more die each year. S. blainei is extremely xerophytic and adapted to very dry soils, but plants grafted on hardy Opuntia compressa stock are very easy to grow and no special skill is required, they can stay in a non heated green house. (min tem -20°C) ... This interesting cactus, continues to be a particular prize among specialist collectors.
 

Pubescent spines of a Juvenile plant.

Photo of conspecific taxa, varieties, forms and cultivars of Sclerocactus spinosior:

• S. spinosior ssp. blainei  "schleseri"
• S. spinosior ssp. blainei  From Iron Co. Utah Photo in habitat by Fred & Judy White

Distribution: This very rare cactus is confined to the western USA. In Nevada (Nye County and Lincoln County); and in Utah (Iron County) The population in Nye Co. is separated by more than 110 km from the colonies of Lincoln Co, but no intermediate plant colony are reported between this two localities. The number of wild individuals is very limited. Type locality: Nye county

Habitat: Grows in salt desert in bottom valley plain at an altitude of 1450-1850 m ASL. among shrub and grass or in open areas on alkaline calcareous and volcanic gravely-clayey soils  

Synonyms:

• Sclerocactus blainei Welsh & Thorne, Great Basin Naturalist 45 (3):553-555, 1985. (Basionym)
• Sclerocactus schleseri Heil & Welsh, Great Basin Naturalist, 46 (4):677-678, 1986
• Sclerocactus spinosior (Engelmann) Woodruff & L. Benson var. schleseri (Heil & Welsh) Hochstätter, Succulenta, Netherlands, 71 (1): 247-262, 1992. 
• Sclerocactus nyensis 72 (3):143, 1993.
• Pediocactus spinosior spp. blainei (Welsh & Thorne) Halda 1998
• Pediocactus spinosior spp. schlesseri (Heil & Welch) Halda 1998

Buds

Flower