Rhododendron species, B
Plant Photo Bank of China (PPBC), B
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Flora of China
PPBC 2011
Rhododendron bachii PPBC
Rhododendron baihuaense 
Rhododendron baileyi 
PPBC
Rhododendron bailiense
Rhododendron bainbridgeanum PPBC
Rhododendron balangense PPBC
Rhododendron balfourianum PPBC
Rhododendron balfourianum var. aganniphoides PPBC
Rhododendron balfourianum var. balfourianum
Rhododendron bamaense PPBC
Rhododendron barbatum PPBC
Rhododendron barkamense PPBC
Rhododendron basilicum PPBC
Rhododendron x bathyphyllum PPBC
Rhododendron beanianum PPBC
Rhododendron beesianum PPBC
Rhododendron bellissimum PPBC
Rhododendron bellum PPBC
Rhododendron bijiangense
Rhododendron bivelatum PPBC
Rhododendron bonvalotii PPBC
Rhododendron boothii PPBC
Rhododendron brachyanthum
Rhododendron brachyanthum subsp. brachyanthum PPBC
Rhododendron brachyanthum subsp. hypolepidotum PPBC
Rhododendron brachypodum PPBC
Rhododendron bracteatum PPBC
Rhododendron brevicaudatum PPBC
Rhododendron brevinerve PPBC
Rhododendron breviperulatum
Rhododendron brevipetiolatum PPBC
2Rhododendron bulu PPBC
Rhododendron bureavii PPBC
Rhododendron bureavoides
Rhododendron benhallii
Rhododendron beyerinckianum Koord.
Russia
Rhododendron bobrovii
Rhododendron burjaticum
R. boninense, Japan, Treeflower PPBC
= On the red list 
= Not on the red list -- updating