Japanese Maple Tree Varieties. Japanese maple tree often refers to maple tree cultivars from Acer palmatum, and also may include maple trees from species Acer japonicum, and Acer shirasawanum. Acer japonicum. Acer palmatum. Acer shirasawanum. A. japonicum Aconitifolium 'Dancing Peacock'.
Vitamins that will stop hair from turning gray. Photo Credit Vitamin C image by Mykola Velychko from <a href='http://www.fotolia.com'>Fotolia.com</a>. Grey hair naturally occurs as you begin to age. The hair is made up of two parts called a shaft and a root. As you get older, the pigments in the hair begin to die, leaving fewer pigments in the hair.
The change in hair color occurs when melanin ceases to be produced in the hair root and new hairs grow in without pigment. The stem cells at the base of hair follicles produce melanocytes, the cells that produce and store pigment in hair and skin. The death of the melanocyte stem cells causes the onset of graying.