Weaver 1919 schematic of prairie plant root system from Patterns from the World Underneath: The Ecological Relations of Roots

John Earnest Weaver. Patterns from the World Underneath: The Ecological Relations of Roots (1919) includes detailed drawings of prairie plants and their extensive root systems. The drawings were made from photographs or at the same time as the root was excavated, provided precise measurements of root depth. Figure 7. Schematic bisect: s, Sieversia ciliata (prairie smoke); e, Wyethia amplexicaulis (black sunfloawer); ll, Lupinus leucphyllus (velvet lupine); lo, Lupinus ornatus (ornate lupine); p, Poa sandbergii (Sandberg bluegrass); e, Leptotenia mutlifada (fernleaf bicuitroot); a, Agropyrum spicatum (bluebunch wheatgrass).