Siler's Pincushion Cactus, Gypsum Cactus, Gypsum Plains Cactus (Pediocactus sile

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CactusJordi El Cajon, CA Aug 21, 2008

Siler's Pincushion Cactus, Gypsum Cactus, Gypsum Plains Cactus
Pediocactus sileri

In habitat in high summer. A young one.

Thumbnail by CactusJordi
Post #5445784
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beckstrommarc Livermore, CA(Zone 9a) Aug 19, 2012

This is NOT!!!! Sclerocactus sileri, who identifies plant photos, they need to be looked at more closely. This plant is?



Marc Beckstrom

Post #9247155
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Xenomorf Phoenix, AZ(Zone 9b) Aug 19, 2012

Well, this is an utter outrage! The plant is Pediocactus sileri
http://calphotos.berkeley.edu/cgi/img_query?enlarge=0000+0000+0608+1477

Post #9247179
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Xenomorf Phoenix, AZ(Zone 9b) Aug 19, 2012

I can see a taxonomic storm brewing.
We're currently using Andersons view in the PlantFiles for Pediocactus/Sclerocactus sileri.
In the Flora of North America, they are listed as two separate species.
Reference: http://en.wikipedia.org/wiki/Pediocactus_sileri

Post #9247191
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beckstrommarc Livermore, CA(Zone 9a) Aug 20, 2012

It is not the best picture to make an ID from and we don’t know the location, but I feel it is a Pediocactus my guess is Pediocactus peeblesianus var. fickeiseniae but it is defiantly not Sclerocactus sileri or Pediocactus sileri.



Marc Beckstrom

Post #9247725
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Xenomorf Phoenix, AZ(Zone 9b) Aug 23, 2012

In comparing to these photos of Pediocactus peeblesianus var. fickeisenii:
http://www.cactus-art.biz/schede/PEDIOCACTUS/Pediocactus_peeblesianus/Pediocactus_peeblesianus_fickeisenii/Pediocactus_peeblesianus_v_fickeisenii_SB468_Fredonia.htm
The main thing I see is that the thicker spines do not lay against the body of the cactus. They instead, protrude outwardly.

The reason I believe it is Pediocactus sileri is, according to this photo:
http://calphotos.berkeley.edu/cgi/img_query?enlarge=0000 0000 0608 1477

The thicker spines lay against the body.

This message was edited Aug 25, 2012 10:58 AM

Post #9251757
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