Egbert Wolf

Salix schwerinii, the narrow-leaf willow, is a species of willow native to northeastern Asia (from Kolyma to northeastern China). It is a shrub or a tree 10 to 15 m (33 to 49 ft) m high with long and exceptionally narrow leaves, similar and closely related to Salix viminalis.

Salix argyracea is a large shrub from the genus of willow (Salix) with up to 10 centimeters long leaf blades with a felty hairy and shiny underside. The natural range of the species is in Kazakhstan, Kyrgyzstan, and China.

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Ulmus × arbuscula E. Wolf [: "bushy" ] is a putative hybrid of Ulmus scabra (: glabra) and Ulmus pumila raised from seed collected from a large wych elm in the St. Petersburg Botanic Garden in 1902. A similar crossing was cloned ('FL025') by the Istituto per la Protezione delle Piante (IPP), Florence, as part of the Italian elm breeding programme circa 2000.

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