The Schweinitz collection consists of a manuscript list of plants by Schweinitz entitled "Index Phaenogamicae Herbarii" and a copy of a biographical sketch of Schweinitz by R. Walter Johnson. The sketch was read before the Academy of Natural Sciences of Philadelphia on May 12, 1835. The copy was made by Eugene Abraham Rau in December 1885. A letter from Rau to Asa Gray accompanies the sketch.