榆树是我国优良的速生用材树种之一,河南是我国榆树主要产区之一。为了充分利用榆树资沅,选育优良的榆树品种和类型。根据历年来的调查研究,将榆树的种类资沅进行初步整理,以供生产和科研的参考。榆树为榆科、榆(尸专)的植物。全世界有45种,分布于北温带。我国有25种,南北各省均有分布。河南有10种,3个变种及3个变型。其中有1新种、1新变种及3新变型。1.大果榆、黄榆 Ulmus mcrocarpaHance Elm is one of the finest growing species in China, and Henan is one of the main producing areas in China. In order to make full use of elm resources, elm breeds elite varieties and types of breeding. According to the investigation and study over the years, the species of elm resources for initial sorting, for the production and research reference. Elm elm, elm (corpse) plants. There are 45 species in the world, located in the northern temperate zone. There are 25 species in our country, all of which are distributed in northern and southern provinces. Henan has 10 species, 3 varieties and 3 variants. There are 1 new species, 1 new variant and 3 new variants. 1 large fruit elm, yellow elm Ulmus mcrocarpaHance