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The New Mexico botanist - New Mexico State University. Cooperative Extension Service. (Range Science Herbarium and Cooperative Extension Service, 2020)

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ning xia liu pan shan he lan shan mu ben zhi wu tu jian 宁夏六盘山贺兰山木本植物图鉴 - Feng, Xiankui 冯显逵 (ning xia ren min chu ban she 宁夏人民出版社, 1979)

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North American flora - New York Botanical Garden (New York Botanical Garden, 1906)

North American flora - New York Botanical Garden (New York Botanical Garden, 1907)