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21a. Rhamnus maximovicziana var. maximovicziana
黑桦树(原变种) hei hua shu (yuan bian zhong)
Rhamnus virgata Roxburgh var. aprica Maximowicz; R. virgata var. mongolica Maximowicz.
Leaf blade elliptic or ovate-elliptic, rarely spatulate, 10-35 × 6-12 mm.
Thickets on mountain slopes; 900-2700 m. Gansu, N Hebei, Nei Mongol, Ningxia, Shaanxi, Shanxi, NW Sichuan [Mongolia].
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