Title: Correspondence
Subjects: Correspondence, Opuntia, Carex, Cyperus, Alismataceae, Identification, Plants, Cyperaceae
Places: Minnesota
People: Warren Upham (1850-1934), John Macoun (1831-1920), George Engelmann (1809-1884), John Merle Coulter (1851-1928), George Vasey (1822-1893)