Mammillaria (Mammillaria geminispina var. brevispina)

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palmbob Acton, CA(Zone 8b) Apr 21, 2004

Mammillaria
Mammillaria geminispina var. brevispina

Potted specimen in nursery in Escondido, California

Post #846773

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Xenomorf Phoenix, AZ(Zone 9b) Nov 10, 2009

Palmbob,
This looks like M. geminispina instead of M. compressa
http://davesgarden.com/guides/pf/showimage/73048/

Post #7259229

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palmbob Acton, CA(Zone 8b) Nov 10, 2009

because of the straight spines? Some of the heads on this thing were pretty large, much larger than I have ever seen M geminispina... compressa is an extremely variable species... though so is geminispina... but I have never seen a geminispina with this much green before, either. What are your suspicions based upon?

Post #7259671

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CactusJordi El Cajon, CA Nov 10, 2009

Xeno, I think you are right. Thanks for figuring it out.

Jordi

Post #7260042

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Xenomorf Phoenix, AZ(Zone 9b) Nov 10, 2009

The overall look of the plant just looks different when sitting side by side all the other M. compressa's on the page.
Specifically, The tubercles are placed tighter together on yours compared to the other M. compressa's.
Also, The amount of white wool is far more abundant on M. geminispina, as is your photo.
I understand that the central spine(s) on the M. geminispina is variable, but your photo isn't a close-up for me to count them.

Xeno.