The point of view is first person oint of view. Celie is the main person, and she telling her side of the story.Because she's the one writing the letters. The reason the author might of picked her its because who else can tell her life story then she can. No one else exacly what happen to her as she was growing up.
Forget-me-not forms a delicate-looking cloud of color in early spring, especially if grown at water's edge: http://www.bhg.com/gardening/flowers/perennials/flowers-for-wet-soil/?socsrc=bhgpin053014forgetmenot&page=11