I have removed the following statement:

White tea is tea made from new growth buds and young leaves of the plant Camellia sinensis.

By Roderick H. Dashwood, "Micronutrient Information Center - Tea". Linus Pauling Institute, Oregon State University

While the above statement is generally true, it does not chacterised white tea. Green tea is made from young buds. Like white tea, it can be one bud, one-bud-one-leaf or one-bud-two-leaf.

More rarely, oolong tea (Oriental beauty), red tea (Keemun) is made from one-bud-and-two-leaf too.

White tea is characterised by its processing, not leaf style.

I have also removed the following statement as they appear in the same place and seems to imply buds and leaves characterise whiet tea:

As white teas contain buds and leaves, whereas other teas are mainly leaves, the dried tea does not look green and has a pale appearance.

Health and Tea FAQs". The University of Arizona

Roderick H. Dashwood, "Spring/Summer 2005 Research Report - Tea Time". Linus Pauling Institute, Oregon State University

White tea appears pale green or silvery grey for two reasons. First, because it has younger leaves, as the above pointed out. Second, because the white tea plants (Baihao, Dabao etc) have very fat buds with white downy hairs.

The modern invention of white tea comes with the breakthough in 1857 of the successful cultivation of modern white tea plants, which have these unusual characteristics to make white tea processing feasible in large commercial scale.

Certain green tea can have whitish leaves as well (such as the Anji Baicha), but that doesn't make them white tea.

Similarly, white tea pearl appears greyish white, but is actually processed like a green tea.