7. Corylus cornuta Marshall

Arbustrum Americanum: 37 (Marshall 1785). – Type: Cult. in Hort. Marshall., 14 Sep. 1835, s. coll., s.n. (neo-, designated here: DWC!). – Note: Humphry Marshall’s original collection is located in DWC with some specimens also in BM (Stafleu & Cowan 1976 –1988). However, there is apparently no extant specimen that can be regarded as original material (S.E. Bartholomew-Began, pers. com.). The specimen chosen here as neotype is from Marshall’s Garden, but collected about 50 years later. As it contains a fruit in its striking horn-like involucre, it allows unambiguous identification.