Despite there being nothing in the scientific literature about the possible existence of multiple genetic variants, the argument in the general Kratom community continues. In the botany world, where cultivation is concerned, there is only 1. There may be other phenotype genetic variations (strains), but farmers are not concerned with differentiating them. They grow only one strain much like Tea. Every plant produces all colors of veins throughout it's life. Red vein is not a genetic varietal, and is merely the color of the vein when the leaves are younger. Whether this has an effect on the chemical composition of the plant remains to be seen. Red Kratom, however, can be characterized by what was presumed to be increased levels of 7ohm. We now know that this is not true and that 7ohm is converted by the liver. The alkaloid 7ohm is red in color. Mitragynine is yellow. Since these alkaloids make up such a small percentage of the total leaf matter, the color is thought to be irrelevant, or negligible when determining the chemical profile.
All Kratom leaf essentially comes from one plant, just like tea. It was thought that the level of oxidation is what sets it apart. Therefore the curing/drying method is responsible for determining the chemical profile. Highly oxidized leaf is considered to be high in the alkaloid 7 hydroxymitragynine, which is not produced by the plant, but instead converted from Mitragynine through photooxidation. It is this oxidation that changes the color of the leaf from green to brown. However, this does not appear to be the case any longer.
To get the highest concentration of Mitragynine, leaf is dried in the dark. It is the mixture of these 2 types of Kratom that accounts for all of the alleged "strains" in existence. Evaluations of Kratom Strains by vendors is completely false. The question then lies: how many different, noticeable alkaloid profiles are there, meaning how many relevant mixtures can be made with these 2 types of Kratom. At some point, it's going to get redundant. So, if you consider every different alkaloid profile to be a strain, how many strains do you think that you could differentiate?