. The ecological relations of roots . A. Yucca glauca, showing the multicipital stems and rhizome habit. B. Praiiie of southeastern Washington. C. Meter quadrat in prairie, showing Balsamorhiza, Festuca, Lithospermum^,£Lnd Hieracium. WEAVER PLATE 18. A. The plains association near Colorado Springs, showing Aristida purpureabunches in Bouteloua gracilis tuif. B. Psoralea tenuiflora in two sections. C. Yucca glauca. WEAVER PLATE 19

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Keywords: ., bookcentury1900, bookdecade1910, bookidecologicalre, bookyear1919