TY - BOOK TI - Publication. Field Museum of Natural History Botanical series VL - v.22:no.6 (1940) UR - https://www.biodiversitylibrary.org/item/19754 PB - Field Museum of Natural History CY - Chicago PY - 1940 SN - 0096-2759 AU - Field Museum of Natural History. KW - America KW - Botany KW - Classification KW - Plants ER -