premise: Phacelia egena is a species of phacelia known by the common name Kaweah River phacelia. It is native to much of California, from the Transverse Ranges to the northern mountains and into Oregon; it also occurs in Arizona. It grows in many types of habitat.
hypothesis: Phacelia egena is the only species of phacelia
reason: Is one of a species of phacelia, there would be no classification or group of species if that was the case