W Aristida purpurea; Artemisia frígida. John E. Weaver. The Ecological Relations of Roots. University of Nebraska, 1917
W Redfieldia fluxuosa, mostrando rizomas y distribución de las raíces. John E. Weaver. The Ecological Relations of Roots. University of Nebraska, 1917
W Apocynum androsaemifolium, mostrando rizomas y una densa red de raíces. John E. Weaver. The Ecological Relations of Roots. University of Nebraska, 1917
W Paronychia jamesii. John E. Weaver. The Ecological Relations of Roots. University of Nebraska, 1917
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