. Annual report of the Director to the Board of Trustees for the year ... Field Museum of Natural History; Natural history. Field Museum of Natural History- Reports, Vol. VIII, Plate XI. RAGWEED (Ambrosia elatior) Hall of Plant Life (HaU 29) The most abundant of the ragweeds of the Chicago region, and probably the principal source of hay fever pollen Reproduced in Stanley Field Plant Reproduction Laboratories One-fourth natural size. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these il

. Annual report of the Director to the Board of Trustees for the year ... Field Museum of Natural History; Natural history. Field Museum of Natural History- Reports, Vol. VIII, Plate XI. RAGWEED (Ambrosia elatior) Hall of Plant Life (HaU 29) The most abundant of the ragweeds of the Chicago region, and probably the principal source of hay fever pollen Reproduced in Stanley Field Plant Reproduction Laboratories One-fourth natural size. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these il Stock Photo
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RM7YR0

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1310 x 1907 px | 22.2 x 32.3 cm | 8.7 x 12.7 inches | 150dpi

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. Annual report of the Director to the Board of Trustees for the year ... Field Museum of Natural History; Natural history. Field Museum of Natural History- Reports, Vol. VIII, Plate XI. RAGWEED (Ambrosia elatior) Hall of Plant Life (HaU 29) The most abundant of the ragweeds of the Chicago region, and probably the principal source of hay fever pollen Reproduced in Stanley Field Plant Reproduction Laboratories One-fourth natural size. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Field Museum of Natural History. Chicago, U. S. A. : Field Museum of Natural History