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The article cites a study which seeks to investigate the hand-pollinating milkmaids such as cardamine californica that is a common native species in California and Oregon. The study considered the 2 populations of milkmaids grew in Presidio of San Francisco. The milkmaids were cross-pollinated through hand, seeds ripened and were harvested. This technique perhaps allowed for other species in which natural reproduction was deficient and improved seed set from 8% to 85%.