Species Notes: Observations by Dale Denham-Logsdon:
I have two M. bombycina plants - one with four central spines and another with 1 to 2 central spines. I don't know if it is significant, but as the close-up seed picture shows, the seeds from the two plants show some differences. For one thing, the seeds of the "two spined" M. bombycina are on the average twice as big as those of the "four spined" version. For another, and perhaps more significantly, (though there are exceptions) the hilum (the scar left from attachment to the ovary) is more or less in line with the major axis for the "two spined" verson while it is curved around 90 degrees for the "four spined" plant.
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