Rhododendron species, A
Plant Photo Bank of China (PPBC), A
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Flora of China
PPBC
Kadsura angustifolia
Rhododendron aberconwayi 
Rhododendron adenanthum Tsutsusi
Rhododendron adenogynum 
Rhododendron adenopodum
Rhododendron adenosum
Rhododendron aganniphum
Rhododendron aganniphum var. aganniphum
Rhododendron aganniphum var. flavorufum
Rhododendron aganniphum var. schizopeplum
Rhododendron agastum
Rhododendron agastum var. agastum
Rhododendron agastum var. pennivenium
Rhododendron albertsenianum
Rhododendron alutaceum
Rhododendron alutaceum var. alutaceum
Rhododendron alutaceum var. iodes
Rhododendron alutaceum var. russotinctum
Rhododendron amandum
Rhododendron ambiguum
Rhododendron amesiae
Rhododendron amundsenianum
Rhododendron annae
Rhododendron annae subsp. annae
Rhododendron annae subsp. laxiflorum
Rhododendron anthopogon
Rhododendron anthopogonoides (gule)
Rhododendron anthosphaerum
Rhododendron aperantum
Rhododendron apricum Tsutsusi
Rhododendron araiophyllum
Rhododendron araiophyllum subsp. araiophyllum
Rhododendron araiophyllum subsp. lapidosum
Rhododendron arboreum
Rhododendron arboreum var. arboreum
Rhododendron arboreum var. cinnamomeum
Rhododendron arboreum var. roseum
Rhododendron argipeplum
Rhododendron argyrophyllum
Rhododendron argyrophyllum subsp. argyrophyllum
Rhododendron argyrophyllum subsp. nankingense
Rhododendron argyrophyllum subsp. omeiense
Rhododendron arizelum
Rhododendron asperulum
Rhododendron asterochnoum
Rhododendron asterochnoum var. asterochnoum
Rhododendron asterochnoum var. brevipedicellatum
Rhododendron atropunicum
Rhododendron atrovirens
Rhododendron augustinii
Rhododendron augustinii subsp. augustinii
Rhododendron augustinii subsp. chasmanthum
Rhododendron aureum
Rhododendron auriculatum
Rhododendron auritum
Afganistan
Rhododendron afghanicum
Japan
Rhododendron amakusaense
Rhododendron albrechtii
USA
Rhododendron arborescens
Rhododendron atlenticum
Rhododendron austrinum
= On the red list 
= Not on the red list -- updating