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 Poplar, or Cottonwood, forest along the banks of the Rio Grande River
This is a large tree reaching a height of 100 feet with a maximum trunk diameter of about 6 1/2 feet with spreading branches, the young twigs slightly hairy, and with very resinous, fragrant buds. The broad, pointed leaves, 2 1/2 to 6 inches long, are somewhat heart-shaped at the base, fine toothed, dark green above, pale beneath, and hairy when young. The male and female flowers are borne in separate catkins 6 inches or less in length, which appear before the leaves. Sievers, A.F. 1930.The Herb Hunters Guide.Misc. Publ. No. 77. USDA, Washington DC
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