Some species may appear to be the same, but are divided by genetic incompatibility. Likewise, many varieties and cultivars within a species are very different from each other. Hybrids may occur between species or genera. Seed from this morning glory will produce plants resembling the distinct variety. Cultivars are either too genetically unstable to produce similar seed, or unable to produce viable seed, as is common with hybrids.
Most cultivars are mutations that produce genetically normal seed.
Although it was somewhat cold recently, the previous warm weather has induced premature bloom of many flowering trees. During normal winter weather, the flowering plum, Prunus blireiana , may start blooming now or may wait as late as April. The genus of Prunus includes many other species of flowering and fruiting plums, as well as prunes, apricots, nectarines, peaches, cherries and almonds, some of which are also currently in bloom. However, Prunus blireiana continues to be one of the most popular. The trees may get to 25 feet high and wide, but are usually smaller.