An Elite Variety for Samara Use: Eucommia ulmoides ‘Huazhong No.7’ An Elite Variety for Samara Use: Eucommia ulmoides ‘Huazhong No.6’ Difference of Samara‘s Form Characters and Gutta-Percha Content from Different Producing Areas Associated with Eucommia ulmoides Variations of Gutta-Percha Content in Samara from Different Eucommia ulmoides Forms Dynamic of Gutta-percha Formation and Accumulation in Samara of Eucommia ulmoides Intraspecific Variation in Samara Morphology of Acer and Its Implication in Fossil Identification Samaras of Ventilago (Rhamnaceae) from the upper Miocene of Lincang, Yunnan, China and their phytogeographic implications Individual Variation of Gutta-percha Content in Samaras of Eucommia ulmoides An Improved Variety for Samara and Medicinal Use: Eucommia ulmoides‘Huazhong 3’ An Elite Variety for Samara Use: Eucommia ulmoides ‘Huazhong No.8’ An Elite Variety for Samara Use: Eucommia ulmoides ’Huazhong NO.9’