Nhu, Is heterostyly the only barrier to self-fertilization? If so, a lot could be accomplished with a camel hair brush. Also, is there any information on whether this trait is dominant, recessive, or simply quantitative (with respect to homostyly or whatever you call the stricta condition)? Thanks Tim Most Oxalis (except for the panglobal weed in the stricta group), are obligate out-crossers, employing a heterostyly system. What that means is that even if you have two clones and they have the same style morphs, they won't make seeds. So multiple clones are necessary for seed production. Nhu