M.magallanii SB 143

In flower today M.magallanii SB 143 from Cerro Bola, Coahuila.



On this plant this is as far has the flowers open. I have seen other plants of this field number where the flowers extend beyond the spines.

M.lasiacanta?

Yes you are quite right it should be M.lasiacanth subsp magallanii.
I was using Pilbeam's book to check the spelling. In the book he mantained M.magallanii has a species based on its 'quite different solitary, columnar habit'.
Hunt places it has a subspeices of lasiacanta althought this could change has the Fizt-Maurice's are working on the classification of series Lasiacanthae at the momment.

Nothing like a bit of sunshine to bring out the flowers