Kyle Barker notes:
Some key points to what separate Lophophora koehresii from the other Lophophora species.
Stem Morphology:
Growth Habit: Often solitary. This one stays smaller than other Lophophora, rarely getting more than 12cm diameter (That is a very large specimen). This species can also severely dehydrate and sink into the soil in some areas.
Skin Colour: Green.
Rib Form: Tends not to have very well defined ribs when older, looks more like small tubercles checkered over the stem. When young, L. koehresii ribs look similar to L. diffusa ribs as far as pattern and areole spacing go.
Number of ribs5,8 & 13 ribs.
Areoles: Spaced further apart than L. fricii and L. williamsii usually, but sometimes can be quite close togethe.
Flower/Fruit Morphology & Reproduction
Petal Colour: Usually white with a pink stripe. Can range from almost white to pink, but often has a light pink stripe in the middle of the petal.
Petal Shape: Long and pointed, much like L. fricii and L. diffusa.
Style colour: White
Filament colour: White
Fruit Colour: Light pink, sometimes a white turning to pink.
# of seeds per fruit (averages): 10-50
Reproduction: Self Sterile, needs 2 genetically unique plants to produce viable seed.
Readily Hybridizes with: L. fricii as the pollen donor. L. fricii doesn't seem to accept L. koehresii pollen.
Key characteristics that define this species from others.
Self sterile. Will not cross with L. diffusa or L. williamsii making it impossible to be the same species as either one of them.
Small, solitary nature.
Unique rib form/pattern different than other Lophophra.
-Kyle Barker | 
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