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• Species 303

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Rhododendron × hemigymnum (Tagg & Forrest) D.F. Chamb.

 

2 1 Observation

Ericaceae

Rhododendron aberconwayi Cowan

 

10 4 Observations

Ericaceae

Rhododendron adenogynum Diels

 

57 20 Observations

Ericaceae

Rhododendron adenosum Davidian

 

43 13 Observations

Ericaceae

Rhododendron aganniphum Balf. f. & Kingdon-Ward

 

18 5 Observations

Ericaceae

Rhododendron alabamense Rehder

Alabama azalea

198 162 Observations

Ericaceae

Rhododendron albiflorum Hook.

White-flower rhododendron

34 25 Observations

Ericaceae

Rhododendron alutaceum Balf. f. & W.W. Sm.

 

26 8 Observations

Ericaceae

Rhododendron ambiguum Hemsl.

 

14 7 Observations

Ericaceae

Rhododendron amesiae Rehder & E.H. Wilson

 

11 2 Observations

Ericaceae

Rhododendron annae Franch.

 

24 10 Observations

Ericaceae

Rhododendron anthopogon D. Don

 

33 4 Observations

Ericaceae

Rhododendron anthosphaerum Diels

Least Concern

 

33 8 Observations

Ericaceae

Rhododendron araiophyllum Balf. f. & W.W. Sm.

 

10 2 Observations

Ericaceae

Rhododendron arborescens (Pursh) Torr.

Least Concern

Sweet azalea

84 67 Observations

Ericaceae

Rhododendron arboreum Sm.

Least Concern

Tree rhododendron

484 224 Observations

Ericaceae

Rhododendron argipeplum Balf. f. & R.E. Cooper

 

13 7 Observations

Ericaceae

Rhododendron argyrophyllum Franch.

 

176 52 Observations

Ericaceae

Rhododendron arizelum Balf. f. & Forrest

 

95 28 Observations

Ericaceae

Rhododendron atlanticum (Ashe) Rehder

Dwarf azalea

26 16 Observations

Ericaceae

Rhododendron augustinii Hemsl.

Augustine's Rhododendron

198 108 Observations

Ericaceae

Rhododendron aureum Georgi

 

68 31 Observations

Ericaceae

Rhododendron auriculatum Hemsl.

 

26 18 Observations

Ericaceae

Rhododendron auritum Tagg

 

5 1 Observation

Ericaceae

Rhododendron austrinum (Small) Rehder

Florida azalea

14 8 Observations

Ericaceae

Rhododendron baileyi Balf. f.

 

3 1 Observation

Ericaceae

Rhododendron balfourianum Diels

 

34 17 Observations

Ericaceae

Rhododendron barbatum Wall. ex G. Don

 

82 30 Observations

Ericaceae

Rhododendron basilicum Balf. f. & W.W. Sm.

 

7 3 Observations

Ericaceae

Rhododendron beanianum Cowan

 

41 11 Observations

Ericaceae

Rhododendron beesianum Diels

Least Concern

 

7 1 Observation

Ericaceae

Rhododendron boothii Nutt.

 

1 1 Observation

Ericaceae

Rhododendron brachyanthum Franch.

 

10 5 Observations

Ericaceae

Rhododendron bureavii Franch.

 

91 34 Observations

Ericaceae

Rhododendron calendulaceum (Michx.) Torr.

Least Concern

Flame azalea

2,793 2,382 Observations

Ericaceae

Rhododendron callimorphum Balf. f. & W.W. Sm.

 

45 14 Observations

Ericaceae

Rhododendron calophytum Franch.

 

114 52 Observations

Ericaceae

Rhododendron calostrotum Balf. f. & Kingdon-Ward

 

62 19 Observations

Ericaceae

Rhododendron camelliiflorum Hook. f.

 

3 3 Observations

Ericaceae

Rhododendron campanulatum D. Don

 

143 55 Observations

Ericaceae

Rhododendron campylocarpum Hook. f.

 

93 30 Observations

Ericaceae

Rhododendron campylogynum Franch.

Bent-style rhododendron

6 3 Observations

Ericaceae

Rhododendron camtschaticum Pall.

Kamchatka rhododendron

9 5 Observations

Ericaceae

Rhododendron canadense (L.) Torr.

Rhodora

107 73 Observations

Ericaceae

Rhododendron canescens (Michx.) Sweet

Least Concern

Hoary azalea

178 129 Observations

Ericaceae

Rhododendron capitatum Maxim.

 

1 1 Observation

Ericaceae

Rhododendron carolinianum Rehder

Carolina azalea

11 4 Observations

Ericaceae

Rhododendron catacosmum Balf. f. ex Tagg

 

17 3 Observations

Ericaceae

Rhododendron catawbiense Michx.

Least Concern

Catawba rhododendron

1,942 1,591 Observations

Ericaceae

Rhododendron cephalanthum Franch.

 

4 1 Observation

Ericaceae

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