Sclerocactus Britton & Rose (1923)

(greek "scleros" = hard, cruel; greek "kaktos" = thistle)
because of its hard seed coat
globular to cylindrical
spines long, flattened, occasionally hooked
flowers bell-shaped and funnelform, opened by day
fruits opens at the base
seeds 3–4 mm large, with a hard skin, tubercular, usually black

Highslide JS
 

Distribution

USA - southwestern deserts
Arizona, California, Colorado, Nevada, New Mexico and Utah
warm arid areas

Growth period

during the summer very dry on a sunny location
plant of this genus are very sensitive to too much moisture
keep the root neck dry and watering only after the soil is complete dried
the cultivation on its own roots is very difficult, grafting is recommendable

Winter period

bright and dry at a minimum of 39°F (4°C)

Soil-mixture

minerally and very permeable to water, porous
addition of expanded slate and quartz gravel is recommended
   
Sclerocactus parviflorus Clover & Jotter (1941)
 
Habitat - Natural Bridges National Monument,
San Juan County, Utah, USA
       
Highslide JS   Highslide JS   Highslide JS
         
Habitat - Monument Valley,
Navajo County, Arizona, USA
       
Highslide JS   Highslide JS   Highslide JS
         
Habitat - Lake Powell,
Coconino County, Arizona, USA
       
Highslide JS   Highslide JS   Highslide JS
         

Habitat

USA
Arizona, Utah, Colorado und New Mexico
Four Corners area
above of 3280 ft (1000 m) up to 6890 ft (2100 m) altitude

Description

small flowered Sclerocactus
cylindrical, to 17,7 in (45 cm) long, 3.5 in (9 cm) Ø
ribs 13, tubercular
14–15 radial spines, to 1.3 in (3.4 cm) long, straight, compressed
4–6 central spines, one of it above
, to 2.4 in (6 cm) long, straight,
3-edged, not hooked, 3 lower to 3 in (7.5 cm) long, 3- to 4-edged, hooked, purple-brown
flowers 1.2–2.4 in (3–6 cm) long, 0.8–2.4 in (2–6 cm) Ø, purple, pistil also purple

Flowering period

May–June in cultivation
April–May in habitat
2–3 years from seed (grafted)

Synonyms

Echinocactus parviflorus (Clover & Jotter) L. D. Benson (1950)
Ferocactus parviflorus
(Clover & Jotter) N. P. Taylor (1979)
Pediocactus parviflorus (Clover & Jotter) Halda (1998)
CITES Appendix II
 
Description of "Kakteen von A bis Z" by Walter Haage with courtesy by Kakteen-Haage made available.

 

 

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