100% Mitragyna Speciosa Leaf Stem and Vein Powder. This finely ground powder has a light tan appearance. The stem and vein part of the kratom plant contains a different variation of natural plant alkaloids than typical leaf powders. Kratom Stem and Vein Powder makes an excellent blend with other leaf powders when added in the 20% – 50% range. It can also be used on its own for a noticeably different aroma.