SECT. PENTANTHERA 



Rhododendron calendulaceum x nudiflorum (and partly x speci- 

 osum) = Rhododendron Mortieri Sweet, Hort. Brit. ed. 2, 343 (1830), 

 as R. Morterii, name only. 



Rhododendron Morterii var. a. cornea Sweet, Hort. Brit. ed. 2, 343 (1830), 



name only; Brit. Flow. Gard. ser. 2, I. t. 10 (1831). 

 Azalea calendulacea i. Morterii De Candolle, Prodr. VII. 718 (1839). 

 Azalea Mortieriana Spae in Ann. Soc. Agric. Bot. Gand, II. 325, t. 81 (1846), 



in part. 

 "Azaleae Mortierianae" Morren in Ann. Soc. Agric. Bot. Gand, III. 9, t. 106 



(1847), in part. 



Azalea Mortieri K. Koch, Dendr. II. 190 (1872), as synonym. 

 Rhododendron calendulaceum var. Morteri Nicholson in Kew Hand-list Arb. 



ed. 2, 497 (1902). 

 Rhododendron Mortieri Zabel in Mitteil. Deutsch. Dendr. Ges. XI. 30 (1902). 



This is stated by Sweet to be a hybrid of and intermediate between R. calen- 

 dulaceum and R. nudiflorum and judging from the colored plate there is no reason 

 to doubt that statement. The pink flowers are large with spreading limb consist- 

 ing of broad lobes of which the upper is almost covered by an orange-yellow blotch. 

 From this form named a. cornea, which must be considered the type, the form praes- 

 tans differs in its pale copper-colored flowers tinged with blush and with the upper 

 lobe of the limb coppery yellow. Sweet states that this plant was received from 

 the Continent under the adopted specific name. 



Of the same parentage and probably referable here as synonyms or varieties 

 are the following forms: 



Azalea calendulacea a. flammea Sims in Bot. Mag. XL VII. t. 2143 (1820), not 

 Michaux. 



The plant figured is apparently neither R. speciosum nor a true R. calendulaceum; 

 the pink corolla tube and the partly pink, partly orange-colored lobes, except the 

 upper one which is entirely orange, may be taken to indicate the influence of R. 

 nudiflorum, though there is a possibility that a variation of R. calendulaceum with 

 more or less pinkish flowers exists. 



Azalea nudiflora TTTT. tricolor Sweet, Hort. Brit. 265 (1826), name only. 



Loddiges, Bot. Cab. XIV. t. 1382 (1828). 

 ? Azalaea tricolor Carr, Cat. Trees & Shrubs Bartram's Bot. Gard. 10 (1814), 



name only. 



Rhododendron nudiflorum inr. tricolor Sweet, Hort. Brit. ed. 2, 344 (1830). 

 Rhododendron tricolor Sweet, Hort. Brit. ed. 2, 343 (1830), "Hybrid 1816." 



Millais, Rhodod. 255 (1917). 



This form is stated to have been received from Philadelphia in 1821, but it 

 belongs apparently to this group of hybrids; the rather slender deep red tube and 



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