Native perennials: North American beauties

Garden/worthy native perennials / Nancy Beaubaire

Floristic provinces map

Choosing native perennials for your garden / Sally Roth

Designing your garden with native perennials / Ken Druse

Growing native perennials / Ruth Rogers Clausen

Why have state wildflowers? / Felder Rushing

Encyclopedia of native perennials

Sources of native perennials

Hardiness zones map.