The Variation of Some California Plants

摘要: In this part of California, where conditions are locally very diverse, plants more variable congenitally than in regions the environment is uniform. For latter, natural selection acts along same line on many generations, and closely breed true to forms fitted their uniform better chances perpetuation; while here unlikely work way generations plants; breeding close a form any one sort decreases number plant's prospective descendants. reason, ubiquists region restricted occurrence. Their variation enables them be ubiquists, being keeps variable. "Mutations," or discontinuous variations, most insignificant individual variations parts unbroken series.