There are others with hyoscyamine like Henbane (Hyoscyamus niger).

Datura stramonium is the only one SWIM has a lot of experience with, and is the only one he's researched concerning safe dosage amounts. With Datura stramonium he feels confident taking 10 or less seeds, knowing good and well that 10 seeds are well within the safe dosage range for Datura stramonium.

Datura inoxia contains mostly scopolamine. SWIM can easily purchase that as well, but has not done his research on that plant. He's interested in trying it, but only after he can determine the safe dosage range for it. SWIM has read that microdoses of scopolamine are sedating, rather than stimulating like hyoscyamine is. But SWIM also read that microdoses of hyoscyamine are also sedating, so he's not sure what to believe there. For SWIM, microdoses of hyoscyamine are definitely stimulating. It's like having a cup of coffee. SWIM likes it quite a bit. SWIM wants to experience microdoses of scopolamine at least once to see if what he's read is accurate or not.